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Typelevel

We do functional programming together!

Welcome to Typelevel!

We are an ecosystem of Scala-based projects and a community of people united to foster an inclusive, welcoming, and safe environment around functional programming. We work together to develop projects that apply functional programming to challenging problems relevant in industry. Our community culture embraces curiosity and mentoring and we don't shy away from experimenting with new and exciting ideas. Most of all, we love to make programming joyful and social.

Get involved!

🐣 Learn 🌱 Start Contributing 🧑‍🏫 Virtual Meetups 🤝 Code of Conduct

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🌐 typelevel.org 💬 Discord 🦋 Bluesky 🐘 Mastodon 📺 YouTube 🌟 Luma 👔 LinkedIn 🩷 GitHub Sponsors

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  1. cats cats Public

    Lightweight, modular, and extensible library for functional programming.

    Scala 5.5k 1.2k

  2. fs2 fs2 Public

    Compositional, streaming I/O library for Scala

    Scala 2.5k 633

  3. scalacheck scalacheck Public

    Property-based testing for Scala

    Scala 2k 392

  4. spire spire Public

    Powerful new number types and numeric abstractions for Scala.

    Scala 1.8k 239

  5. cats-effect cats-effect Public

    The pure asynchronous runtime for Scala

    Scala 2.3k 585

  6. discipline discipline Public

    Flexible law checking for Scala

    Scala 338 60

Repositories

Showing 10 of 117 repositories
  • cats-tagless Public

    Library of utilities for tagless final encoded algebras

    typelevel/cats-tagless's past year of commit activity
    Scala 321 Apache-2.0 42 9 (4 issues need help) 5 Updated Nov 4, 2026
  • twiddles Public

    Micro-library for building effectful protocols

    typelevel/twiddles's past year of commit activity
    Scala 70 BSD-3-Clause 3 0 10 Updated Nov 4, 2026
  • fs2 Public

    Compositional, streaming I/O library for Scala

    typelevel/fs2's past year of commit activity
    Scala 2,456 633 106 (7 issues need help) 48 Updated Nov 4, 2026
  • cats-mtl Public

    cats transformer type classes.

    typelevel/cats-mtl's past year of commit activity
    Scala 308 66 22 (2 issues need help) 6 Updated Nov 4, 2026
  • fs2-kafka Public

    Functional Kafka for Scala

    typelevel/fs2-kafka's past year of commit activity
    Scala 316 Apache-2.0 114 1 1 Updated Nov 3, 2026
  • typelevel.github.com Public

    typelevel.org website

    typelevel/typelevel.github.com's past year of commit activity
    HTML 42 113 21 11 Updated Nov 3, 2026
  • catapult Public
    typelevel/catapult's past year of commit activity
    Scala 16 Apache-2.0 5 5 (2 issues need help) 3 Updated Nov 3, 2026
  • vulcan Public

    Functional Avro for Scala

    typelevel/vulcan's past year of commit activity
    Scala 106 Apache-2.0 38 1 0 Updated Nov 3, 2026
  • malaga-workshop-2026 Public

    Collaborative project for the workshop at Typelevel Traverses Málaga in October 2026

    typelevel/malaga-workshop-2026's past year of commit activity
    Scala 0 MIT 7 0 0 Updated Nov 3, 2026
  • otel4s Public

    An OpenTelemetry library for Scala based on Cats-Effect

    typelevel/otel4s's past year of commit activity
    Scala 216 Apache-2.0 50 8 (3 issues need help) 0 Updated Nov 3, 2026

Sponsors

  • @stasimus
  • @antoniojimeneznieto
  • @vladimir-popov
  • @rtyley
  • @yoshinorin
  • @a-nigredo
  • @DavidGregory084
  • @lhns
  • @BalmungSan
  • @lorandszakacs
  • Private Sponsor

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