Y CombinatorS20

Supabase is an open-source Postgres development platform providing databases, authentication, APIs, and real-time subscriptions.

Beanbag is a software company that develops the open-source code review tool Review Board.

Y CombinatorW23

AI prototype generator for product teams that converts text prompts, images, and Figma designs into production-ready React code.

Pipeshift provides a cloud platform for fine-tuning and deploying open-source AI models.

Unipile provides a unified messaging API for WhatsApp, LinkedIn, email, and calendar integrations.

Y CombinatorW14

Algolia: Developer-friendly, enterprise-grade search API powering innovative discovery experiences.

Cloud communications platform providing APIs for voice, messaging, video, and authentication.

Open-source application stack for web developers with headless, type-safe, composable tools.

The Software Agent Company. Build software with AI agents that understand your entire codebase.

Developer-first privacy infrastructure automating cookie consent, compliance, and DSARs for modern web teams backed by YC.

Y CombinatorS23

AI-powered developer onboarding platform providing VSCode extension for contribution guideline alignment and team collaboration efficiency.

AI-native design platform enabling non-technical teams to ship UI changes directly from production codebases.

Y CombinatorW18

Replit operates a browser-based AI platform for building and deploying apps, websites, and mobile projects.

Foundation model company bringing intelligence to everywhere work gets done; builds AI agents and models for software development.

Y CombinatorS21

Hyperbrowser provides scalable browser infrastructure for AI agents and developers.

Vercel is a developer platform for building scalable web experiences and AI-native applications.

Clerk provides embeddable UIs, APIs, and dashboards for authentication and user management.

Y CombinatorW22

Mintlify builds software for developer documentation, knowledge bases, and AI-facing product information.

Y CombinatorS10

Docker, Inc.: Leading software container platform for developers and enterprises, enhancing app deployment and management.

Identity platform for authentication and fraud prevention, acquired by Twilio in 2025.

Y CombinatorW21

Social SDK that added leaderboards, clans, and social features to mobile games