Developer Tools

$500K YC 2025; 100K+ developers; React Native generator; Fastest iOS build; One-click App Store; YC W25

$500K YC 2025; Pennie Huang/Pasha Rayan (ex-Forage acquired) founders; Twilio for AI; Communication APIs; YC W25

$500K YC W25; TechCrunch top 10; Jesse (ex-Waymo)/Ke (ex-YouTube/Brex)/Meji (ex-AWS) founders; Teleoperation API; YC W25

ActiveCampaign is a customer experience automation platform that combines email marketing, marketing automation, sales automation, and CRM capabilities in one solution. The platform serves small to mi

Activepieces is an open-source workflow automation platform that serves as an alternative to Zapier, Make.com, and Workato, enabling teams to build automated workflows without code. Founded in 2022, t

Airbyte is an open-source data integration platform that enables organizations to replicate data from applications, databases, and APIs into data warehouses, lakes, and databases. The platform serves

Alchemy is the leading blockchain development platform powering Web3 apps, providing APIs for blockchain interactions, smart contracts, and rollup infrastructure. Decacorn valued at $10.2B.

Algolia is the AI-powered search and discovery platform offering API-first search solutions for websites and applications. The platform handles 1.75+ trillion searches annually.

Anthropic is an AI safety and research company focused on building reliable, interpretable, and steerable AI systems, best known for developing Claude, a family of large language models. The company s

Anyscale is a platform that enables organizations to build and deploy distributed AI and Python applications at scale using Ray, the open-source framework for distributed computing. The company serves

Apigee is Google Cloud's API management platform acquired by Google for $625M in 2016. Named Leader in 2025 Gartner API Management Magic Quadrant (10th consecutive year, highest for Ability to Execute

AppDynamics is a leading application performance management (APM) and full-stack observability platform that helps enterprises optimize their applications and business outcomes. Founded in 2008 and ac

Aqua Security is a cloud-native security platform that protects containerized and serverless applications throughout the development lifecycle and runtime. The company serves DevOps teams, security pr

Archbee is a YC W21-backed documentation platform that provides AI-powered tools for technical teams to create, manage, and share documentation, featuring GPT-4 Write Assist, AI question answering, an

Artie is a San Francisco California-based real-time data streaming company founded in 2023 by Jacqueline Cheong Robin Tang building change data capture platform for databases warehouses raising $3.8M

AssemblyAI is a Speech AI platform providing speech-to-text APIs and audio intelligence for over 200,000 developers worldwide. The company focuses on conversation intelligence and voice agent applicat

Atla is a United Kingdom-based AI agent improvement company founded in 2023 by Maurice Burger Roman Engeler building improvement engine for AI agents raising $5M seed December 2023 led by Creandum wit

AuthZed is a New York-based leader in permissions systems as a service founded in 2020 by CoreOS and RedHat veterans Jake Moshenko, Joey Schorr, and Jimmy Zelinskie. The company created the open-sourc

Aviator is a San Francisco-based engineering productivity platform founded by ex-Googlers that automates merge workflows, code reviews, and repetitive development tasks to improve team velocity across

Baserun is an observability and evaluation platform for Large Language Model (LLM) applications that helps AI development teams streamline their entire development cycle from identifying issues to eva

Beam is a New York-based AI-native cloud platform that enables developers to deploy and scale AI/ML workloads through serverless infrastructure with automated scaling and cost optimization. Founded in

Bitbucket is a Git-based code repository and collaboration platform for software development teams, owned by Atlassian. The company provides source code management, continuous integration/deployment p

Blacksmith is a high-performance continuous integration (CI) platform founded in January 2024 by University of Waterloo alumni Aditya Jayaprakash (JP), Aayush Shah, and Aditya Maru. The San Francisco-

$4M Seed (Floodgate); Rohan Vasishth/Faraz Siddiqi (ex-Amazon/Microsoft 23yo) founders; Fortune 500 clients; YC X25

Brainboard is a Paris-based AI-driven platform that enables engineers to visually design and manage cloud infrastructures with integrated Terraform automation. Founded in 2019, the company has raised

BrowserStack is a cloud-based suite of software testing solutions that enables developers to test websites and applications across browsers, serving over 50,000 customers including tech giants like Go

$17M Seed (Felicis); Magnus Müller/Gregor Žunič (ETH Zurich) founders; 50K+ GitHub stars; Manus integration; YC W25

Bruno is an open-source API client and IDE for exploring and testing APIs, positioned as lightweight alternative to Postman/Insomnia. Git-friendly, fast, offline-first design. Golden Edition provides

Bugsnag is an automated error monitoring platform for detecting errors in web and mobile applications, acquired by SmartBear Software on May 18, 2021. 2021 revenue: $2.2M (from $1.4M 2017); 6,000+ cus

BuildBuddy provides enterprise features for Bazel, the open-source build system, offering remote build execution, caching, and observability features designed for enterprise-scale Bazel deployments. T

BuildJet is a Tallinn Estonia-based high-performance computing cloud company founded in 2022 by Adam Shiervani and Lian Duan building CI platform on Gaming CPUs making GitHub Actions 2x faster cheaper

Buildkite is a hybrid CI/CD platform for running fast, secure, scalable pipelines on customer infrastructure. 2024 revenue: $17.9M; 134 employees. Total funding: $47.2M; latest Series B $21M (Nov 2022

Bunny.net is a cloud-based content delivery network management solution provider finishing September 2024 as the third fastest CDN in the world. The company raised $6M in Series A funding in October 2

Bytebot is a San Francisco-based infrastructure company that provides an open-source container platform (Apache 2.0) enabling AI agents to control Linux desktop environments and automate complex workf

YC S24; AI mechanical engineer; Autonomous system design; CAD automation; YC Summer 2024

CaptivateIQ is a no-code incentive compensation management platform helping businesses automate sales commissions, bonuses, and variable pay calculations. The company enables finance and revenue opera

YC W25; Secure agent sandboxes; One-command deployment; MCP connectors; AI infrastructure; YC W25

Cerebrium is a serverless cloud infrastructure platform that enables companies to build and deploy AI applications at scale, delivering 40% cost savings versus traditional cloud providers while scalin

Clerk is the authentication and user management platform for developers, partnered with Stripe for billing integration. Serves 1,300+ paying customers managing 16M+ users.

Cloudflare is a global cloud platform providing CDN, security, and edge computing services. $2.01B revenue in 2025 (+28% YoY), $73.7B market cap, 210,000+ paying customers, 3,902 employees. 82% market

CodeAnt AI is an India-based AI code health platform founded 2024 raising $2.5M total ($500K seed 2024 plus $2M seed May 8 2025 led by Y Combinator VitalStage Ventures Uncorrelated Ventures DeVC Trans

CodeCrafters is a Concord, CA-based programming education platform founded in 2022 that offers hands-on "Build Your Own X" challenges where experienced software engineers recreate popular dev tools fr

$16.2M Seed July 2023 (Thrive); Jay Hack founder; Adam D'Angelo/Mike Krieger angels; Code agents; AI automation

Codeium is an AI-powered code acceleration toolkit that provides developers with intelligent code completion, natural language code generation, and automated refactoring capabilities across multiple p

Cohere is an enterprise AI platform that provides large language models and natural language processing capabilities for businesses to build search, content generation, and classification applications

Confluent is a data streaming platform built on Apache Kafka serving 4,910 customers including 1,381 with $100K+ ARR. FY 2024 revenue $964M (+24% YoY), subscription revenue $922M (+26%), Confluent Clo

Cosine is a San Francisco-based AI company building autonomous software engineering agents that enable development teams to work on multiple tickets simultaneously. Founded by Yang Li, Alistair Pullen

Cursor is an AI-powered code editor built on Visual Studio Code that integrates advanced language models to provide intelligent code completion, generation, debugging, and refactoring capabilities dir

Customer.io is a customer engagement platform that enables businesses to send targeted, behavior-driven messages across email, SMS, push notifications, and in-app channels to improve conversion and re

Cypress is an open-source, JavaScript-based end-to-end testing framework designed specifically for modern web applications, providing developers with fast, reliable automated testing capabilities. The

Datafold automates critical data engineering workflows including data migrations, code testing and review, and monitoring and observability for modern data teams. Founded in 2020 by Gleb Mezhanskiy an

Dataland is a Y Combinator-backed (W20) database software company that provides no-code collaborative data management and workflow automation tools, enabling teams to centralize and analyze business i

Deepgram is the voice AI platform for speech-to-text and text-to-speech APIs, serving 200K+ developers and 400+ enterprises. Ended 2024 cash-flow positive with 3.3x usage growth, over 1 trillion words

Defog.ai is a San Francisco California-based enterprise data analysis company founded in 2023 by Rishabh Srivastava building fine-tuned LLMs for enterprise data including SQLCoder raising $2.7M total

YC batch; System design AI; Architecture assistance; Deep codebase analysis; Vibe coding; YC

Depot is a build acceleration platform founded in 2022 that enables developers to speed up software builds by up to 40x through faster CI/CD tooling. The company has raised $4.22M in total funding, in

Docker is a platform for developing, shipping, and running applications in lightweight, portable containers that package software with all dependencies, enabling consistent deployment across different

Docker Hub is the world's largest container image registry and library, providing a platform for developers to discover, share, and distribute Docker container images for applications and services. Th

YC X25; AI agent testing; Autonomous QA; Browser agents; Coding agent testing; YC Spring 2025

Dollyglot is like Character.AI but with real-time video avatars. Turn a photo and a voice into a real friend. They developed the world's first and only photo-to-real-time video avatar model. Unlike st

DraftAid is a Toronto-based artificial intelligence startup pioneering the automation of CAD manufacturing drawings, positioning itself as the world's first generative AI platform specifically designe

Drata is a security and compliance automation platform that continuously monitors and collects evidence for SOC 2, ISO 27001, GDPR, HIPAA, and other compliance frameworks, streamlining audit processes

Ellipsis is an AI developer tool founded 2024 raising $2M seed April 2024 led by Twenty Two Ventures Four Cities Capital Garage Capital Amino Capital Transpose Platform Management Pioneer Fund followi

$23M Series A (Lightspeed); $15M ARR in 90 days; 1M+ users; Jeff Dean/Balaji angels; Mukund/Madhav Jha (ex-Dunzo) founders; YC

Envoy is CNCF graduated project (graduated November 2018) and the most popular sidecar and ingress provider for service mesh. Default sidecar in Istio, Open Service Mesh, and AWS App Mesh. Envoy Gatew

Epsilla is a United States-based AI agent platform founded by Richard Song building all-in-one AI agents with private knowledge raising $500K from Y Combinator Nivesha Ventures Ride Wave Ventures achi

Eventual is a San Francisco-based AI infrastructure company that develops Daft, an open-source Python-native data processing engine designed to handle multimodal data (images, audio, video, and struct

Exa is a San Francisco-based AI search engine that builds web search infrastructure specifically designed for LLMs and AI agents rather than humans, using embedding models and neural search technology

Extend is a San Francisco-based cloud platform that leverages large language models to provide fast, accurate document processing and data extraction for enterprises. The company has raised $17M in co

FarmLogs is a farm management software platform that helps farmers track field activities, monitor crop performance, manage records, and analyze profitability through mobile and web applications. The

Fastly is an American cloud computing company providing content delivery network (CDN) services, image optimization, load balancing, and cloud security capabilities. The public company (NYSE: FSLY) re

Feedonomics is a product feed management and optimization platform that helps e-commerce brands and retailers syndicate product data to marketplaces, comparison shopping engines, and advertising chann

Fern is a New York New York-based API tooling company founded in 2022 by Danny Sheridan and Deep Singhvi building SDK and API documentation generator raising $13M total funding including $9M Series A

Firecrawl is a web data infrastructure platform that provides an AI-optimized scraping API, converting websites into clean, structured data for AI applications and autonomous agents. Founded in 2024 a

Flagsmith is fully bootstrapped, generating $1M+ ARR (July 2024) from clients like Citi Bank and United Health Group after raising only $229K from Polychrome. Open-source feature flagging tool enables

Flower is a San Francisco-based company that builds the world's most popular open-source federated learning framework, enabling organizations to train AI models on distributed data while maintaining p

FlutterFlow is a Mountain View, California-based no-code/low-code platform founded in 2020 that enables developers and non-technical users to build native mobile and web applications using Google's Fl

Fly.io is a cloud computing platform specializing in deploying and running applications globally at the edge, offering developers infrastructure to run containerized applications across multiple regio

GitHub Actions is a CI/CD and workflow automation platform integrated into GitHub that enables developers to build, test, and deploy code directly from their repositories. The company serves software

GitHub Copilot is an AI-powered coding assistant that provides intelligent code suggestions, autocomplete, and context-aware recommendations directly within developers' code editors. The company serve

Gitpod is a cloud development environment platform that provides instant, ready-to-code development workspaces accessible from any browser without local setup. The company serves software developers a

Greptile is an AI-powered code review platform that provides automated code analysis with complete codebase context, continuously monitoring GitHub repositories to catch bugs and enforce company stand

GrowthBook is an open-source feature flagging and A/B testing platform founded in 2020 that enables companies to build customized experimentation systems on top of their existing data warehouses. The

H2O.ai is an enterprise artificial intelligence platform that enables organizations to build, deploy, and operationalize machine learning models at scale. The company serves data scientists, AI engine

$3.8M Seed Dec 2024 (Mischief); Sumanyu Sharma (ex-Citizen/Tesla)/Marius Buleandra (ex-Anduril/Spell) founders; YC W25

Harness is a CI/CD and software delivery platform that uses AI to automate and accelerate the software release process. The platform helps DevOps teams deploy more reliably and efficiently.

HashiCorp develops infrastructure automation software that enables organizations to provision, secure, and manage cloud infrastructure across multiple platforms. The company serves DevOps teams, platf

Helicone is an open-source observability platform for Large Language Models (LLMs), founded in 2023 by Justin Torre, Scott Nguyen, and Cole Gottdank. Headquartered in San Francisco, California, the co

Heroku is a leading cloud application platform founded in 2007 and acquired by Salesforce for $212M in 2010. 65M+ apps built on platform, 65B+ requests served daily, 38M+ data stores created. Named Le

Hightouch is a reverse ETL platform that enables companies to sync data from warehouses to business applications, activating customer data across marketing, sales, and support tools. The company serve

Hoppscotch is an open-source API development ecosystem with 500,000+ developers globally. Total funding: $3M Seed (Dec 2021) led by OSS Capital, with Automattic (WordPress.com parent). Founded 2019 by

hotglue is a Washington D.C.-based embedded iPaaS provider that enables SaaS companies to build native, user-facing integrations for their customers in minutes. Founded in 2020 (YC W21), the company r

Hugging Face is an AI platform and community that provides access to pre-trained machine learning models, datasets, and tools for natural language processing and other AI tasks. The company serves AI

Humanloop is an enterprise-grade AI evaluation platform offering best-in-class prompt management and LLM observability for development teams at companies like Gusto, Vanta, and Duolingo. Founded in 20

YC F25; Agent memory infrastructure; Slack/Gmail/Notion integration; AI coworker API; YC Fall 2025

IcePanel is a Vancouver Canada-based software architecture design platform company founded in 2018 by Victor Leach building SaaS tool for tech teams to collaborate on software architecture design rais

YC batch; InfluxDB creator; Autodesk/Cisco/eBay/Coupa clients; Time series leader; DevOps and IoT; YC

Infracost is a San Francisco, California-based cloud cost management platform founded in 2020 that provides engineers with visibility into infrastructure costs during development, enabling cost-aware

Inkeep is a San Francisco-based AI agent platform founded in 2023 that enables developers and non-developers to build and deploy AI-powered assistants and automations for customer experience and go-to

Insomnia is an API testing and development platform acquired by Kong on October 2, 2019. 1M+ users (Sept 2024), fastest-growing platform for building, testing, debugging APIs. Founded 2014 by Gregory

YC batch; Autonomous debugging; Physical hardware testing; Beyond code generation; YC

Istio is CNCF graduated open-source service mesh project (graduated 2023), achieving production-grade quality and mainstream adoption. Ambient Mode innovation: sidecar-less architecture with 90%+ memo

Jestor is a San Francisco-based no-code/low-code platform that enables companies to build custom internal tools, automate workflows, and manage databases without extensive coding knowledge. Founded in

Jet Admin is a no-code internal tool builder enabling businesses to create custom applications such as internal tools, admin panels, and client portals without coding. Founded in 2018, the San Francis

JetBrains is a software development tools company creating integrated development environments and productivity tools for professional developers across multiple programming languages. The company ser

Jitsu is a cloud-based open-source data integration platform built to process large amounts of event data at scale in real-time. Founded in 2019 by Peter Wysinski and Vladimir Klimontovich, the San Fr

YC batch; Web agent infrastructure; Cloud browser hosting; AI agent deployment; YC

Kong is an API gateway and service mesh platform that closed a $175M Series E in Nov 2024 at $2B valuation led by Tiger Global. Revenue $146.1M in 2024 (up from $100M in 2023). Total raised $345M from

LanceDB is an open-source, serverless vector database that enables efficient storage, retrieval, and management of vectors and multimodal data for production-scale generative AI applications. The comp

Lancey is a Toronto-based AI engineering platform that builds multiplayer AI agents to automate bug fixes and code reviews for engineering teams. Founded by twin brothers Adi and Abhi Patel (former Ad

Langfuse is a Berlin-based open-source LLM engineering platform that provides observability, analytics, and prompt management tools for AI applications. Founded in 2022 and backed by $4.5M in funding

Lightdash is an open-source business intelligence platform positioning itself as an alternative to Google's Looker, enabling self-serve data analytics for teams. Founded in 2021, the London-based comp

Lightspeed is a cloud-based point-of-sale and commerce platform serving retail, restaurant, and hospitality businesses with integrated payment processing, inventory management, and customer engagement

Linear is a modern issue tracking and project management tool designed specifically for software development teams, emphasizing speed, simplicity, and workflow efficiency. The platform offers streamli

Lume is a San Francisco-based infrastructure company that builds an AI-powered platform to automate data mapping workflows, reducing implementation timelines from weeks to days. Founded in 2023, the c

MagicBell is a Y Combinator-backed (W21) notification infrastructure platform that provides developers with a unified API and UI components to deploy multi-channel notifications across in-app, email,

Magic Patterns is an AI-powered design platform that enables developers to transform ideas into production-ready code without traditional design workflows. Founded in 2023 and based in San Francisco,

Marketo is a leading marketing automation platform, now part of Adobe, that provides email marketing, lead management, consumer marketing, and account-based marketing capabilities for B2B and B2C mark

$24M total ($20M Series A Basis Set); Taranjeet Singh/Deshraj Yadav (ex-Tesla/Paytm) founders; 41K GitHub stars; AWS Agent SDK; YC

Memberstack is a Y Combinator-backed no-code membership platform that enables businesses to build and manage memberships, user authentication, and gated content without coding, primarily for Webflow a

Meticulous is a London-based test automation company that provides automated end-to-end screenshot testing for web applications by recording user sessions and automatically generating visual tests, el

YC batch; Triple-digit growth; 800+ new customers; CRN Hottest DevOps; EMA Top 3 Observability; YC

Middleware is a San Francisco-based observability platform that unifies metrics, logs, traces, and events into a single AI-powered timeline, enabling DevOps teams to debug cloud infrastructure issues

Mindee is a San Francisco-based document AI and OCR technology company founded in 2017 that provides computer vision-powered APIs for automated data extraction from invoices, receipts, IDs, and variou

Mintlify is an AI-powered documentation platform that auto-generates and maintains software documentation from codebases, serving 3,000+ customers including Anthropic, Cursor, Perplexity, and Zapier w

Mistral AI is Europe's leading AI foundation model company. €60M revenue projected for 2025 (5x from €10M in 2023), €11.7B valuation in 2025, €2.8B total funding. €300M annual contract value secured w

Mito is a New York-based developer tools company that provides a JupyterLab spreadsheet extension that automatically generates Python code as users edit data, enabling Excel users to transition to aut

Mocha is a United States-based AI-powered no-code app builder company founded in 2023 by Nicholas Charriere Ben Reinhart building full-stack web application platform raising $2.1M funding 2025 backed

Modal is a serverless compute platform designed specifically for machine learning and AI workloads, enabling developers to run code in the cloud without managing infrastructure. The platform provides

Momentic is an AI-native automated testing platform that enables development teams to create and execute end-to-end tests using natural language, eliminating traditional QA bottlenecks. Founded in lat

MongoDB is the leading NoSQL database platform serving 59,000+ customers with FY 2025 revenue of $2.01B (+19% YoY). Public company (MDB). Atlas cloud revenue grew 24% in Q4 FY2025. 65,743 companies us

MuleSoft is an Integration Platform as a Service (iPaaS) acquired by Salesforce for $6.5B in 2018. Part of Salesforce Integration and Analytics segment that generated $5.8B revenue (FY 2025, combined

Mux is the video API platform for developers, providing streaming infrastructure and analytics used by Vimeo, Robinhood, CBS, and TED. Valued at $1B+ with $46.1M revenue in 2024.

n8n is the open-source workflow automation platform offering self-hosted and cloud options. Distinguished by AI-native capabilities with 70+ LangChain nodes, n8n competes with Zapier and Make.

Nango is a San Francisco California-based integration infrastructure company founded in 2022 building unified API platform for product integrations enabling developers to build maintain API connection

Neon is a serverless Postgres database platform that separates storage and compute to enable autoscaling, database branching, and scale-to-zero capabilities. The company scaled to $25M ARR and over 70

Netlify is a web development platform for modern web applications that reached $46.3M revenue in 2024 (up from $33M in 2023). $2B valuation with $212.1M raised (Series D $105M Nov 2021 led by Bessemer

Noloco is a Dublin-based no-code platform founded in 2020 that enables teams to build internal tools and business applications from databases like PostgreSQL, MySQL, Airtable, and Google Sheets withou

Observe Inc. is an AI-powered observability platform company founded in 2017, headquartered in San Mateo, California. The company provides a comprehensive cloud-native observability solution that help

Odigos Technologies Inc. is a Boston Massachusetts-based observability company founded in 2023 by Eden Federman and Ari Recht building enterprise-grade OpenTelemetry platform raising $13M+ funding Sep

YC W25; Agent command center; Multi-device continuity; Claude Code support; AI infrastructure; YC W25

Onboard.io is a Detroit-based customer onboarding software platform that automates and streamlines implementation processes for B2B SaaS companies. Founded in 2020 and backed by Y Combinator (W22), th

Onlook is building the Cursor for designers, an open-source visual IDE that makes it easy for designers and developers to collaborate in code. Their product allows users to either start building a new

OpenAI is an artificial intelligence research and deployment company that develops advanced AI models including GPT-4, DALL-E, and ChatGPT for natural language processing, image generation, and reason

OpenAI Platform provides developer APIs and tools for integrating OpenAI's large language models including GPT-4, GPT-3.5, embeddings, and moderation capabilities into applications and services. The c

Opsera is a pioneering force in the DevOps automation space, redefining how enterprises approach software delivery and security through its AI-powered continuous orchestration platform. Founded in Jan

Orchids is the AI Full Stack Engineer, capable of handling everything from UI design to backend infrastructure with minimal human intervention. The AI-powered website and app builder generates fully f

PandasAI is a Germany-based open-source conversational data analysis platform company founded 2023 by Gabriele Venturi raising $1.22M total over 2 rounds including $1.1M pre-seed fall 2023 from Runa C

ParadeDB is a United States-based database company founded in 2023 building transactional Elasticsearch alternative built on Postgres as extension raising $14M total over 2 rounds including $12M Serie

Paradigm is revolutionizing productivity through AI-powered spreadsheet technology that embeds intelligent agents directly into every cell. Founded in 2024 by 22-year-old prodigy Anna Monaco, the San

Paw is a Mac-native API development tool that was bootstrapped to $50K MRR before being acquired by RapidAPI in 2021. Founded in 2014 by a 22-year-old founder, Paw ran profitably for 11 years focusing

Pinecone is a managed vector database service optimized for storing and searching high-dimensional vectors used in machine learning applications like semantic search, recommendation systems, and retri

Plaid is the fintech infrastructure company powering digital finance by connecting applications to users' bank accounts. Used by most top fintech apps for account linking and data access.

PlanetScale is a MySQL-compatible serverless database platform powered by Vitess, the open-source clustering system created at YouTube. Founded by Vitess creators, the company offers database-as-a-ser

Planful is a cloud-based financial planning and analysis (FP&A) platform that provides budgeting, forecasting, reporting, and scenario modeling tools for finance teams. The company serves mid-market t

Playwright is an open-source browser automation framework developed by Microsoft for end-to-end testing of web applications across Chromium, Firefox, and WebKit browsers. The company serves developers

Portainer.io raised $14M total funding (Series A June 2022) from Bessemer Venture Partners, Shasta Ventures, Bright Pixel Capital, and others. Founded 2016 in Auckland, New Zealand, Portainer simplifi

Postman is an API development platform providing tools for designing, testing, documenting, monitoring, and collaborating on APIs throughout the development lifecycle. The company serves developers, Q

Prequel is a San Francisco-based data integration and transformation platform founded in 2021 that enables SaaS companies to build embedded ETL pipelines and data integrations for their customers. The

Productive.io is an all-in-one agency management platform designed for creative and professional services firms to manage projects, track time, allocate resources, and monitor profitability. The softw

Promptless is an AI teammate that automatically updates customer-facing docs. It drafts updates proactively based on feature releases, support tickets, and internal Slack conversations. Used by fast-g

PropelAuth is a Mountain View-based authentication infrastructure provider specializing in end-to-end B2B authentication solutions, offering team-based features including organizations, roles, RBAC, S

Pythagora is a Croatia-based AI development platform founded 2023 raising $4M seed May 14 2024 led by 500 Global Y Combinator UpHonest Capital Moonfire Inovo Rebel providing world's first all-in-one A

Quantstruct is an AI documentation engineer that tests and auto-improves stale product docs. They work with hypergrowth companies like Vapi (YC W21) and enterprises building API/SDK products, visual s

QuestDB is an open-source time-series database offering blazingly fast ingestion and dynamic, low-latency SQL queries through column-oriented storage, parallelized vector execution, SIMD instructions,

QuickNode is a Miami, Florida-based blockchain infrastructure platform founded that provides developers and enterprises with tools and APIs to build, test, and scale Web3 applications with lightning-f

Railway is the infrastructure platform simplifying application deployment and scaling. Developers can provision infrastructure, develop locally, and deploy to the cloud seamlessly.

Rancher Labs was acquired by SUSE in December 2020 for $600M-$700M (~30x revenue multiple) to create the world's largest organization exclusively dedicated to open source and cloud-native solutions. A

RapidAPI is an API marketplace platform with $44.9M revenue in October 2024, serving 55K customers and 4M+ developers. Acquired by Nokia on November 13, 2024 after reaching $1B valuation in March 2022

Raycast is a productivity tool that serves as an extendable launcher for engineering teams, saving time on non-coding tasks in apps like Jira, GitHub, and Slack which can consume up to 50% of a develo

Reducto is a San Francisco-based AI infrastructure company that provides the industry's most accurate document parsing API, enabling enterprises and AI teams to extract and process data from PDFs, spr

Reflex is a San Francisco California-based web application framework company founded in 2023 building pure Python web framework enabling developers to build production-grade web apps in minutes achiev

Regie.ai is an AI-powered sales engagement platform that automates and personalizes outbound prospecting through generative AI technology. The platform creates customized email sequences, generates pe

Release provides Environments as a Service (EaaS) for development teams, offering ephemeral, test, QA, and staging environments that can be created on-demand to streamline development and remove bottl

Render is the modern cloud platform for developers, competing with Heroku and Vercel. Jan 2025 raised $80M Series C with $159M total funding, serving 500K+ developers with 2B+ services launched.

Replicate is a cloud platform that makes it easy to run and deploy machine learning models at scale through a simple API. The service provides access to thousands of pre-trained models for image gener

Replit is a collaborative cloud-based integrated development environment (IDE) that enables developers to write, run, and deploy code directly in the browser across multiple programming languages. The

Resend is a San Francisco California-based email platform company founded in 2023 by Bu Kinoshita and Zeno Rocha building developer-first email API raising $21M total funding including $3M seed July 2

Retool is the leading low-code platform for building internal tools, used by companies like Amazon, DoorDash, and Brex. The platform enables developers to build custom software 10x faster.

Roboflow is a computer vision platform that simplifies the process of building, training, and deploying custom vision AI models for developers and businesses. The platform provides tools for dataset m

Rollbar is a full-stack error monitoring platform for web and mobile applications providing real-time error tracking and debugging tools. Total funding: $17.4M-$25.9M (sources vary) over 4 rounds; lat

Rootly is a San Francisco-based incident management platform that automates workflows through Slack integration, helping companies resolve incidents 80% faster while managing over 60,000 incidents ann

YC batch; Serverless streaming; Kafka + S3 concept; Real-time data infrastructure; YC

Scaleway is a French cloud computing company founded 1999, operating as subsidiary of Iliad Group. Sept 2025 annual revenue: $750M (estimates vary $5M-$1B range); serves 38,000+ customers across 160 c

Scoro is a comprehensive work management platform designed for professional services firms and agencies to manage projects, track time, handle finances, and collaborate across teams. The software inte

Selenium is an open-source testing framework that automates web browsers for testing web applications across different browsers and platforms. The tool suite includes Selenium WebDriver, Selenium IDE,

Semaphore is the fastest CI/CD platform on the market, powering world's best engineering teams. Silver Member of The Linux Foundation; core CI/CD platform open source under Apache 2.0 license. Pricing

Sendbird provides chat API and messaging infrastructure powering in-app communications for mobile and web applications. Used by 4,000+ apps including DoorDash and Yahoo Sports.

Sentry is an application monitoring platform that provides error tracking, performance monitoring, and debugging tools for software development teams. The platform automatically captures errors, excep

Shuttle is an AI-enabled cloud infrastructure platform that enables developers to deploy applications code-to-cloud in seconds with zero configuration. The Y Combinator-backed company raised $6M in se

Signadot provides a Kubernetes-native microservices testing platform that enables teams to create on-demand, ephemeral testing environments (Sandboxes) within existing Kubernetes clusters. The company

Silimate is a United States-based chip design company founded in 2023 participating in Y Combinator S23 batch building AI copilot for chip designers raising $2.5M total funding from Pioneer Fund MBA F

Snyk is a developer security platform that helps organizations find and fix vulnerabilities in open source dependencies, container images, infrastructure as code, and application code. The company ser

SonarQube is an open-source platform for continuous code quality and security analysis, automatically detecting bugs, vulnerabilities, and code smells across multiple programming languages. The compan

Speedscale is a Kubernetes performance testing platform that captures real user traffic, automatically generates tests and mocks, and multiplies sanitized traffic for load testing to help engineering

Spline is a collaborative web-based 3D design platform founded in 2020 that enables designers and developers to create interactive 3D experiences, games, and applications through a no-code interface w

YC S24; AI QA engineer; Natural language website testing; Test automation; YC Summer 2024

$7.2M Seed (Salesforce Ventures); Edward Aryee/Raj Kadiyala (ex-Google DeepMind) founders; DevOps AI; YC

Stably AI is a San Francisco-based AI testing automation platform that auto-generates, runs, and maintains end-to-end tests in CI with zero flakiness and self-healing capabilities that automatically r

StackAI is a Cambridge, Massachusetts-based enterprise AI platform that enables organizations to build custom AI assistants through a low-code solution requiring no deep coding expertise. Founded in 2

Stacker is an online no-code platform enabling users to convert spreadsheet data into enterprise applications without programming knowledge. Founded in 2017 by Michael Skelly and Sam Davyson, headquar

YC batch; Frontend agents; Beyond code generation; Full lifecycle development; YC

Stayntouch is a cloud-based hotel property management system designed for modern, mobile-first hospitality operations with flexible integrations and guest-centric features. The company serves independ

Strapi is the leading open-source headless CMS, 100% JavaScript/TypeScript, fully customizable and developer-first. Total funding: $49M (Series B June 2022: $31M led by CRV with Flex Capital, Index Ve

Subtrace is a zero-code network tracer that gives backend teams full visibility into every request - payload, latency, status, headers, logs - all in one place. It's like having an inspect element but

Supabase is the open-source Firebase alternative providing PostgreSQL database, authentication, edge functions, and real-time subscriptions for developers building modern applications.

$500K YC March 2025; Stefan Faistenauer/Adina Goerres founders; Open-source GPL; Enterprise integrations; Self-healing tools; YC W25

Superwall is a San Francisco-based mobile paywall platform that enables app developers to remotely configure and optimize subscription paywalls without app updates, processing 100 million monthly view

Svix is a webhooks-as-a-service platform that provides enterprise-ready webhook infrastructure for developers, enabling companies to send billions of webhooks reliably and securely through both open-s

Swagger is an open-source framework and toolset for designing, building, documenting, and consuming RESTful APIs through the OpenAPI Specification. The company serves API developers, architects, and o

Swoogo is an enterprise event management platform enabling organizations to create, manage, and measure virtual, hybrid, and in-person events with registration, engagement, and analytics tools. The co

Tabnine is an AI-powered code completion tool that uses machine learning to predict and suggest code snippets, functions, and entire lines of code across multiple programming languages. The company se

Tailor operates a headless ERP platform that replaces monolithic legacy systems for retail operations, offering modular, composable infrastructure for ecommerce and omnichannel retailers with minimum

Telnyx is a communications platform as a service (CPaaS) provider offering voice, messaging, wireless, and connectivity APIs for developers and businesses building communication applications. The comp

Temporal Technologies develops an open-source durable execution platform that makes code resilient to server crashes, network partitions, and long delays, enabling developers to build reliable applica

Thoropass is a compliance automation platform that helps companies achieve and maintain security and privacy certifications including SOC 2, ISO 27001, HIPAA, and GDPR through continuous monitoring. T

Tiptap is a Germany-based developer tools company founded in 2023 by Philip Isik Nick Hirche Sebastian Schrama Sven Adlung Timo Isik Patrick Baber building developer toolkit for building collaborative

ToDesktop is a platform that helps developers convert web applications into desktop apps using Electron technology, providing infrastructure and tooling to simplify desktop app creation and maintenanc

Traceloop is a Tel Aviv Israel-based LLM observability platform company founded in 2022 building monitoring evaluation observability solutions for large language model applications raising $6.6M total

$500K YC 2025; $16K MRR bootstrapped; Shaunak Srivastava/Rahul K founders; Saiki agent; Multi-LLM support; YC W25

Turso is an edge-hosted, distributed database platform built on libSQL, a fork of SQLite, that enables globally distributed applications and AI agents to deploy databases close to users worldwide. Fou

Tweeks.io is a browser extension that lets users modify any website to add functionality, filter/highlight, re-theme, reorganize, or de-clutter. It's like a next-generation userscript manager similar

Ubicloud is an open source cloud platform that provides an alternative to AWS, offering services including elastic compute, block storage, load balancers, managed Postgres, and GitHub Actions runners

Unify is a Y Combinator-backed AI infrastructure platform that enables enterprises to "Hire AI, Not APIs" through a unified access layer that eliminates API complexity and integration overhead. The co

VectorShift is a United States-based AI tech company founded in 2023 by Alex Leonardi Albert Mao ex-Blackstone McKinsey building no-code generative AI automations platform raising $3.5M total over 2 r

Vellum is a New York-based AI development platform that provides end-to-end infrastructure for building production-ready LLM applications, enabling developers to engineer prompts, evaluate models, and

Velt is a Y Combinator-backed developer collaboration toolkit that provides a JavaScript SDK enabling developers to add 25+ collaborative features to their apps in under 30 minutes, including AI-power

Vercel is the frontend cloud platform that enables developers to build, deploy, and scale web applications. Creator and maintainer of Next.js, the most popular React framework.

Versori is a London-based agentic integration platform that enables businesses to build, deploy, and manage custom integrations and workflows through its no-code, AI-powered automation solution. Found

Visual Studio Code is a free, open-source code editor developed by Microsoft that provides developers with intelligent code completion, debugging, version control integration, and extensibility throug

Vocode is a United States-based voice AI company founded in 2023 by Kian Hooshmand and Ajay Raj building open-source voice AI library raising $3.75M total funding including $3.25M seed February 2024 f

WarpBuild is a Y Combinator-backed continuous integration infrastructure company that provides 10x faster GitHub runners and AI-powered software delivery insights to accelerate development pipelines.

Wasp is a full-stack web development framework founded in 2020 by twin brothers Martin and Matija Šošić that provides a declarative domain-specific language for building web applications with React, N

Waydev is a YC W21-backed Engineering Productivity Intelligence Platform that helps software teams measure and improve developer productivity through DORA, SPACE, and DX metrics with AI-driven insight

Webhound is a United States-based AI research agent company founded in 2023 building automated web dataset creation platform raising $38.7M total from Unpopular Ventures Y Combinator Amino Capital par

Weights & Biases is a machine learning operations platform that helps data scientists and ML engineers track experiments, visualize model performance, and collaborate on AI projects. The company serve

WeWeb is a Paris, France-based no-code front-end builder founded in 2019 that enables teams to build production-grade web applications 10x faster by connecting any backend without vendor lock-in. The

Whalesync is a San Francisco-based infrastructure company that provides no-code bi-directional data synchronization between business tools including Airtable, Notion, HubSpot, Webflow, and PostgreSQL,

$30M Seed (largest YC history); Filip Kozera/Robert Chandler founders; #1 Product Hunt; Instacart/Runway clients; YC S24

Zep AI is a context engineering platform founded 2023 raising $3.3M total (conflicting sources: $500K YC April 2024 vs $2.3M-$3.3M from Engineering Capital Step Function Vercel Google founders) hittin