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Y Combinator X25

YC Spring 2025 developer tools companies

27 dev-tool and infrastructure startups from YC Spring 2025 (X25): 24 active, 3 open source, 2 on DevHunt. Top tags: Developer Tools, AI, Infrastructure, Machine Learning. From YC's public directory, snapshot of 2026-10-20.
  • Sixtyfourx25Active

    Intelligence Infrastructure on People and Entities

    12 people · San Francisco, CA, USA · Enterprise Software, Infrastructure, AI · YC page

  • Naïvex25Active

    Autonomous Company Infrastructure

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

  • cubicx25ActiveOn DevHunt

    AI-powered code review platform

    6 people · London, England, United Kingdom · Developer Tools · YC page

  • HelixDBx25Active

    The fastest & most scalable graph-vector database on the market

    6 people · London, England, United Kingdom · Developer Tools, Open Source, Infrastructure, AI · YC page

  • MindFortx25Active

    Autonomous Security Agents

    6 people · Los Angeles, CA, USA · Developer Tools, Cybersecurity, Enterprise Software, AI · YC page

  • Clideyx25Active

    Turn scattered data into one platform for decision-making

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

  • Tinfoilx25Active

    Encrypted AI with verifiable privacy

    5 people · San Francisco, CA, USA · Developer Tools, Security, Privacy, Cloud Computing · YC page

  • Aravoltax25Active

    Software to monitor, control, and optimize data centers.

    4 people · San Francisco, CA, USA · Enterprise Software, Cloud Computing, Monitoring · YC page

  • Better Authx25ActiveOn DevHunt

    The authentication framework for TypeScript

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

  • Attunex25Active

    Faster builds, zero effort.

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

  • Cuax25Active

    Give every agent a cloud desktop

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

  • Feynx25Active

    Custom models trained on your data

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

  • Human Behaviorx25Active

    Understand your users beyond the numbers

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

  • Kairosx25Active

    Specialized AI for Critical Industries

    3 people · San Francisco, CA, USA · AIOps, Machine Learning, Reinforcement Learning, AI · YC page

  • PgDogx25Active

    Scaling engine for PostgreSQL

    3 people · San Francisco, CA, USA · Databases · YC page

  • StarSlingx25Active

    Self-Driving CI: fast AI-native GitHub Actions runners

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

  • Capacitivex25Active

    The data gateway for agents.

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

  • Chironx25Active

    Grammarly for Math ✏️

    2 people · London, England, United Kingdom · AI-Enhanced Learning, Developer Tools, Education, Edtech · YC page

  • Docketx25Active

    AI agents for web testing

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

  • Kashikoix25Active

    Simulation Engine for Benchmarking AI Products

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

  • mlopx25Active

    Experiment tracking for training ML models

    2 people · London, England, United Kingdom · AIOps, Developer Tools, Machine Learning · YC page

  • Prismx25Active

    Abundant Intelligence for Everyone

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

  • Golfx25Active

    Agentic AI Security and Governance

    1 person · San Francisco, CA, USA · Developer Tools, Security, Infrastructure, AI · YC page

  • ParaQueryx25Active

    Managed GPU-accelerated Spark + SQL at 2x speed and half the cost

    1 person · New York City, NY, USA · Developer Tools, Analytics, Big Data, Enterprise Software · YC page

  • Blaxelx25Acquired

    The infrastructure for autonomous agents

    12 people · San Francisco, CA, USA · Developer Tools, Cloud Computing, Infrastructure, AI · YC page

  • BitPatrolx25Acquired

    AI-powered code security

    1 person · New York City, NY, USA · DevSecOps, Machine Learning, Cybersecurity · YC page

  • Percivalx25Inactive

    Accelerating data analysis for research

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

FAQ

How many developer tools companies are in YC Spring 2025 (X25)?+

27 launched companies in YC Spring 2025 carry a developer-tools or infrastructure tag in YC's directory (snapshot of 2026-10-20); 24 are active. Companies that have not launched publicly on YC's site yet are not counted.

What are the top tags in YC X25 dev tools?+

Developer Tools (20), AI (15), Infrastructure (8), Machine Learning (4), Cloud Computing (3). 3 of 27 are tagged open source.

Which YC X25 dev-tool companies are the largest?+

By team size on YC's directory: Sixtyfour, Naïve, cubic.

← Summer 2025Winter 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.