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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 635

  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 577

  6. discipline discipline Public

    Flexible law checking for Scala

    Scala 337 61

Repositories

Showing 10 of 115 repositories
  • skunk Public

    A data access library for Scala + Postgres.

    typelevel/skunk's past year of commit activity
    Scala 1,667 MIT 175 75 (2 issues need help) 15 Updated Sep 25, 2026
  • otel4s-experimental Public

    A companion project for exploring experimental features in otel4s

    typelevel/otel4s-experimental's past year of commit activity
    Scala 8 Apache-2.0 3 1 4 Updated Sep 25, 2026
  • otel4s-sdk Public

    Implementation of the otel4s SDK modules in Scala from scratch

    typelevel/otel4s-sdk's past year of commit activity
    Scala 6 Apache-2.0 3 6 (1 issue needs help) 2 Updated Sep 25, 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 7 Updated Sep 25, 2026
  • feral Public

    Feral cats are homeless, feral functions are serverless

    typelevel/feral's past year of commit activity
    Scala 195 Apache-2.0 53 31 (4 issues need help) 47 Updated Sep 24, 2026
  • natchez-http4s Public

    Glorious integration layer for Natchez and Http4s.

    typelevel/natchez-http4s's past year of commit activity
    Scala 50 MIT 18 4 12 Updated Sep 23, 2026
  • fs2-kafka Public

    Functional Kafka Streams for Scala

    typelevel/fs2-kafka's past year of commit activity
    Scala 315 Apache-2.0 111 1 3 Updated Sep 23, 2026
  • cats Public

    Lightweight, modular, and extensible library for functional programming.

    typelevel/cats's past year of commit activity
    Scala 5,468 1,245 223 (6 issues need help) 55 Updated Sep 22, 2026
  • typelevel-nix Public

    Development tools for Typelevel projects

    typelevel/typelevel-nix's past year of commit activity
    Nix 134 Apache-2.0 11 5 4 Updated Sep 22, 2026
  • jawn-fs2 Public

    Integration between jawn and fs2

    typelevel/jawn-fs2's past year of commit activity
    Scala 40 18 1 4 Updated Sep 22, 2026