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Y Combinator F25

YC Fall 2025 developer tools companies

17 dev-tool and infrastructure startups from YC Fall 2025 (F25): 15 active, 2 open source, 0 on DevHunt. Top tags: Developer Tools, AI, Infrastructure, No-code. From YC's public directory, snapshot of 2026-10-20.
  • Hyperspellf25Active

    Your Company Brain

    8 people · San Francisco, CA, USA · Machine Learning, Data Engineering, AI · YC page

  • Mossf25Active

    Real-time semantic search for Conversational AI

    5 people · San Francisco, CA, USA · Developer Tools, AI · YC page

  • s2.devf25Active

    API for unlimited, durable, real-time streams

    5 people · San Francisco, CA, USA · Developer Tools, Open Source, API, Infrastructure · YC page

  • Parsef25Active

    Build an API to interact with any website.

    4 people · San Francisco, CA, USA · Developer Tools, API, Big Data · YC page

  • Fastshotf25Active

    Lovable for mobile apps

    3 people · Thessaloniki, Greece · Developer Tools, No-code, AI, AI Assistant · YC page

  • MSPilotf25Active

    Turn AI adoption into a recurring revenue line.

    3 people · San Francisco, CA, USA · Generative AI, No-code, Infrastructure, AI · YC page

  • Sourcebotf25Active

    Helping humans and AI agents understand massive codebases

    3 people · San Francisco, CA, USA · Developer Tools, Open Source, AI · YC page

  • Amikaf25Active

    Infra to build your own software factory

    2 people · New York City, NY, USA · Machine Learning, Infrastructure, AI · YC page

  • Compylef25Active

    The coding agent that actually collaborates with you

    2 people · San Francisco, CA, USA · Developer Tools, AI · YC page

  • dari.devf25Active

    The Routing Layer for AI Agents

    2 people · San Francisco, CA, USA · Developer Tools · YC page

  • Kestrel AIf25Active

    AI Agents for Platform Engineering

    2 people · San Francisco, CA, USA · AIOps, Developer Tools, DevOps, Infrastructure · YC page

  • Lemmaf25Active

    Production Monitoring for AI agents

    2 people · San Francisco, CA, USA · Developer Tools, Analytics, Infrastructure, Monitoring · YC page

  • Radiusf25Active

    Code and browse in the same place

    2 people · San Francisco, CA, USA · Developer Tools, Design, Design Tools, AI · YC page

  • Specificf25Active

    The cloud platform built for coding agents

    2 people · Stockholm, Stockholm County, Sweden · Developer Tools, No-code, DevOps, AI · YC page

  • The Context Companyf25Active

    Find what's losing you customers and money in your AI agent and fix it

    2 people · San Francisco, CA, USA · Developer Tools, Analytics, Monitoring, AI · YC page

  • Rovrf25Inactive

    AI FDE Engine that runs your engineering workflows

    3 people · San Francisco, CA, USA · Developer Tools, AI · YC page

  • Coastsf25Inactive

    Localhost service isolation and orchestration for git worktrees

    2 people · Developer Tools, Productivity, Design, Web Development · YC page

FAQ

How many developer tools companies are in YC Fall 2025 (F25)?+

17 launched companies in YC Fall 2025 carry a developer-tools or infrastructure tag in YC's directory (snapshot of 2026-10-20); 15 are active. Companies that have not launched publicly on YC's site yet are not counted.

What are the top tags in YC F25 dev tools?+

Developer Tools (14), AI (12), Infrastructure (5), No-code (3), Analytics (2). 2 of 17 are tagged open source.

Which YC F25 dev-tool companies are the largest?+

By team size on YC's directory: Hyperspell, Moss, s2.dev.

← Winter 2026Summer 2025 →All YC dev-tool companiesOpen-source YC companies

Source: Y Combinator's public company directory via the unofficial mirror yc-oss/api. DevHunt is not affiliated with Y Combinator.