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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 636

  3. scalacheck scalacheck Public

    Property-based testing for Scala

    Scala 2k 393

  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 2.2k 574

  6. discipline discipline Public

    Flexible law checking for Scala

    Scala 337 61

Repositories

Showing 10 of 115 repositories
  • typelevel-nix Public

    Development tools for Typelevel projects

    typelevel/typelevel-nix's past year of commit activity
    Nix 134 Apache-2.0 11 5 3 Updated Sep 15, 2026
  • typelevel.github.com Public

    typelevel.org website

    typelevel/typelevel.github.com's past year of commit activity
    HTML 42 115 24 10 Updated Sep 15, 2026
  • fs2 Public

    Compositional, streaming I/O library for Scala

    typelevel/fs2's past year of commit activity
    Scala 2,453 636 103 (7 issues need help) 36 Updated Sep 15, 2026
  • cats-collections Public

    Data structures for pure functional programming in Scala

    typelevel/cats-collections's past year of commit activity
    Scala 563 108 15 (1 issue needs help) 13 Updated Sep 15, 2026
  • grackle Public

    Grackle: Functional GraphQL for the Typelevel stack

    typelevel/grackle's past year of commit activity
    Scala 189 Apache-2.0 32 22 5 Updated Sep 15, 2026
  • fs2-grpc Public

    gRPC implementation for FS2/cats-effect

    typelevel/fs2-grpc's past year of commit activity
    Scala 284 MIT 66 9 5 Updated Sep 15, 2026
  • fs2-kafka Public

    Functional Kafka Streams for Scala

    typelevel/fs2-kafka's past year of commit activity
    Scala 314 Apache-2.0 111 1 4 Updated Sep 15, 2026
  • vulcan Public

    Functional Avro for Scala

    typelevel/vulcan's past year of commit activity
    Scala 104 Apache-2.0 38 2 0 Updated Sep 15, 2026
  • cats Public

    Lightweight, modular, and extensible library for functional programming.

    typelevel/cats's past year of commit activity
    Scala 5,466 1,246 224 (7 issues need help) 61 Updated Sep 15, 2026
  • toolkit Public

    Quickstart your next app with the Typelevel Toolkit!

    typelevel/toolkit's past year of commit activity
    Scala 101 Apache-2.0 9 8 (1 issue needs help) 14 Updated Sep 15, 2026