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Y Combinator W26

YC Winter 2026 developer tools companies

13 dev-tool and infrastructure startups from YC Winter 2026 (W26): 13 active, 1 open source, 0 on DevHunt. Top tags: AI, Developer Tools, Infrastructure, API. From YC's public directory, snapshot of 2026-10-20.
  • Piris Labsw26Active

    The Networking Layer of AI

    8 people · San Francisco, CA, USA · Hard Tech, Hardware, Infrastructure, AI · YC page

  • RunAnywherew26Active

    Fastest inference anywhere: open models on-prem, hosted or on-device

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

  • /dev/fastw26Active

    /dev/fast is the AI-native code forge

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

  • Shofow26Active

    The World's Largest Video Library

    4 people · San Francisco, CA, USA · Data Labeling, Infrastructure, AI · YC page

  • Corelayerw26Active

    AI production engineer for regulated industries

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

  • Approximaw26Active

    Your software should build itself.

    2 people · Toronto, ON, Canada · Enterprise Software, Infrastructure, AI · YC page

  • Captainw26Active

    Self-tuning search for products and files

    2 people · San Francisco, CA, USA · API, Data Engineering, Search, Infrastructure · YC page

  • Fernw26Active

    RL environments for robotics companies

    2 people · Robotics, Infrastructure · YC page

  • IncidentFoxw26Active

    AI SRE agent that triages, coordinates, and fixes production incidents

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

  • o11w26Active

    OpenRouter wallet for paid goods and services

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

  • Quotient Labsw26Active

    Use Claude Code at 47% less cost in one line of installation.

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

  • Salusw26Active

    Guardrails to validate your agent's actions before they execute

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

  • Skillsyncw26Active

    Notion for AI chats

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

FAQ

How many developer tools companies are in YC Winter 2026 (W26)?+

13 launched companies in YC Winter 2026 carry a developer-tools or infrastructure tag in YC's directory (snapshot of 2026-10-20); 13 are active. Companies that have not launched publicly on YC's site yet are not counted.

What are the top tags in YC W26 dev tools?+

AI (9), Developer Tools (8), Infrastructure (7), API (2), AIOps (1). 1 of 13 are tagged open source.

Which YC W26 dev-tool companies are the largest?+

By team size on YC's directory: Piris Labs, RunAnywhere, /dev/fast.

← Spring 2026Fall 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.