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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.

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🐣 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 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 577

  6. discipline discipline Public

    Flexible law checking for Scala

    Scala 337 61

Repositories

Showing 10 of 115 repositories
  • cats Public

    Lightweight, modular, and extensible library for functional programming.

    typelevel/cats's past year of commit activity
    Scala 5,467 1,245 224 (7 issues need help) 60 Updated Sep 20, 2026
  • fabric Public

    Object-Notation Abstraction for JSON, binary, HOCON, etc.

    typelevel/fabric's past year of commit activity
    Scala 132 MIT 5 0 14 Updated Sep 20, 2026
  • kittens Public

    Automatic type class derivation for Cats

    typelevel/kittens's past year of commit activity
    Scala 545 Apache-2.0 66 7 5 Updated Sep 20, 2026
  • simulacrum-scalafix Public

    Simulacrum as Scalafix rules

    typelevel/simulacrum-scalafix's past year of commit activity
    Scala 36 10 6 7 Updated Sep 20, 2026
  • natchez Public

    functional tracing for cats

    typelevel/natchez's past year of commit activity
    Scala 340 MIT 76 16 17 Updated Sep 19, 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 19, 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 2 Updated Sep 19, 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 19, 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) 1 Updated Sep 19, 2026
  • vault Public

    Type-safe, persistent storage for values of arbitrary types

    typelevel/vault's past year of commit activity
    Scala 84 MIT 20 1 4 Updated Sep 19, 2026