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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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  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 2.2k 580

  6. discipline discipline Public

    Flexible law checking for Scala

    Scala 338 60

Repositories

Showing 10 of 115 repositories
  • keypool Public

    A Keyed Pool Implementation for Scala

    typelevel/keypool's past year of commit activity
    Scala 39 MIT 19 8 8 Updated Oct 6, 2026
  • catapult Public
    typelevel/catapult's past year of commit activity
    Scala 16 Apache-2.0 5 5 (2 issues need help) 9 Updated Oct 6, 2026
  • otel4s-sdk Public

    Implementation of the otel4s SDK modules in Scala from scratch

    typelevel/otel4s-sdk's past year of commit activity
    Scala 7 Apache-2.0 3 6 (1 issue needs help) 5 Updated Oct 6, 2026
  • fs2-grpc Public

    gRPC implementation for FS2/cats-effect

    typelevel/fs2-grpc's past year of commit activity
    Scala 284 MIT 66 9 6 Updated Oct 6, 2026
  • otel4s Public

    An OpenTelemetry library for Scala based on Cats-Effect

    typelevel/otel4s's past year of commit activity
    Scala 215 Apache-2.0 49 7 (2 issues need help) 5 Updated Oct 6, 2026
  • fs2-netty Public

    What it says on the tin!

    typelevel/fs2-netty's past year of commit activity
    Scala 47 Apache-2.0 13 3 23 Updated Oct 6, 2026
  • typelevel.github.com Public

    typelevel.org website

    typelevel/typelevel.github.com's past year of commit activity
    HTML 42 113 23 12 Updated Oct 6, 2026
  • feral Public

    Feral cats are homeless, feral functions are serverless

    typelevel/feral's past year of commit activity
    Scala 195 Apache-2.0 52 31 (4 issues need help) 47 Updated Oct 6, 2026
  • scalacheck Public

    Property-based testing for Scala

    typelevel/scalacheck's past year of commit activity
    Scala 1,964 BSD-3-Clause 392 56 (1 issue needs help) 19 Updated Oct 5, 2026
  • typelevel.g8 Public

    A typelevel.g8 based on sbt-typelevel

    typelevel/typelevel.g8's past year of commit activity
    Scala 14 6 8 5 Updated Oct 5, 2026