Y Combinator W25 Batch Companies

50 companies from YC's Winter 2025 batch with sector, country, and description — 64% are AI-focused.
# company
batch
sector
country
description
status
+
1 Aven W25 Fintech US Home equity credit card — borrow against your home at low rates via a Visa card Active
2 Warp W25 Developer Tools US AI-native terminal and development environment Active
3 Cactus W25 Healthcare US AI copilot for physical therapists to reduce documentation time Active
4 Fern W25 Developer Tools US Generate SDKs and documentation from API definitions Active
5 Leaping AI W25 AI/ML US AI agents for enterprise customer support automation Active
6 Lumos W25 HR Tech US Unified identity and access management for modern companies Active
7 Pika W25 Generative AI US AI video generation platform from text and images Active
8 Rhino W25 Proptech US Security deposit insurance replacing upfront cash deposits Active
9 Mintlify W25 Developer Tools US AI-powered documentation platform for developer-facing products Active
10 Baseten W25 AI Infrastructure US ML model serving and inference infrastructure Active
11 Coframe W25 AI/ML US AI that continuously A/B tests and improves website copy Active
12 Trieve W25 Developer Tools US Search, RAG, and recommendations infrastructure API Active
13 Cursor W25 Developer Tools US AI-first code editor built on VS Code fork Active
14 Harvey W25 Legal Tech US AI legal research and drafting platform for law firms Active
15 Lovable W25 Developer Tools Sweden AI full-stack engineer — build web apps via natural language Active
16 Perplexity W25 AI/ML US AI-powered answer engine and conversational search Active
17 Pylon W25 B2B SaaS US Customer support platform built for B2B companies Active
18 Cohere W25 AI/ML Canada Enterprise NLP APIs and language models Active
19 Draft W25 Legal Tech US AI contract review and negotiation for startups Active
20 Vapi W25 AI Infrastructure US Voice AI platform for building phone-call agents Active
21 Morph W25 Developer Tools US AI code editing API for building coding assistants Active
22 Glean W25 Enterprise Search US AI-powered workplace search across all company tools Active
23 Abridge W25 Healthcare AI US AI ambient documentation for clinical conversations Active
24 Supabase W25 Developer Tools Singapore Open source Firebase alternative with Postgres Active
25 Lago W25 Fintech France Open source metering and billing API for usage-based pricing Active
26 Linear W25 Productivity US Issue tracking and project management for software teams Active
27 Inngest W25 Developer Tools US Background job and workflow orchestration platform Active
28 Exa W25 AI/ML US Neural search API for AI applications Active
29 Letta W25 AI Infrastructure US Memory layer and agent runtime for long-context LLM agents Active
30 OpenPipe W25 AI/ML US Fine-tuning pipeline to train smaller, cheaper task-specific models Active
31 Speakeasy W25 Developer Tools US SDK and API documentation generation from OpenAPI specs Active
32 Nango W25 Developer Tools UK Open source unified API for third-party integrations Active
33 Infisical W25 Security US Open source secret management platform Active
34 Firecrawl W25 Developer Tools US Web scraping and crawling API for LLM training data Active
35 Composio W25 AI Infrastructure US Tool and action integrations for AI agents Active
36 Browserbase W25 Developer Tools US Cloud browser infrastructure for AI agents Active
37 Langfuse W25 AI Infrastructure Germany Open source LLM observability and tracing platform Active
38 Hamming W25 AI Testing US Automated testing and evaluation for AI voice agents Active
39 Substrata W25 Sales AI US AI that reads nonverbal signals in sales conversations Active
40 Recall.ai W25 AI/ML US Unified API for meeting bots across Zoom, Meet, and Teams Active
41 Koala W25 Marketing AI US AI SEO content generation platform for teams Active
42 Writer W25 AI/ML US Full-stack generative AI platform for enterprises Active
43 Arcade W25 Developer Tools US Interactive product demos and onboarding flows Active
44 Ramp W25 Fintech US Corporate card and spend management platform Active
45 Merge W25 Developer Tools US Unified API for HR, payroll, and recruiting integrations Active
46 Windmill W25 Developer Tools France Open source developer platform for scripts and workflows Active
47 Resend W25 Developer Tools US Email API built for developers Active
48 Unkey W25 Developer Tools US Open source API authentication and key management Active
49 Mastra W25 AI Infrastructure US TypeScript framework for building AI agents and workflows Active
50 Kevel W25 Adtech US API-first ad serving infrastructure for publishers Active

Y Combinator W25 Batch Companies — AI Analysis

64% of YC W25 companies (32 of 50) mention AI in their sector or description

Developer Tools is the top sector with 18 companies (36%), followed by AI/ML with 8 (16%)

YC W25 Batch Overview

  • Developer Tools (18) and AI/ML (8) together account for over half the batch — 52% of all companies
  • 86% of the batch (43 companies) are US-based; only 7 companies come from outside the US
  • AI Infrastructure is the 3rd largest sector with 6 companies building tooling for model deployment, observability, and evaluation
  • The remaining 13 companies span 11 different sectors from Fintech to Adtech — high fragmentation outside the top 3
  • Every company in the batch is currently active — no shutdowns yet in this cohort

Visualizations

Companies by Country
AI-Focused vs Other Companies
Companies by Sector

This dataset contains 50 records across 6 fields: company, batch, sector, country, description, status.

50 rows · 6 columns · 2026-03-25

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Combinator W25 Batch Companies