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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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  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 584

  6. discipline discipline Public

    Flexible law checking for Scala

    Scala 338 60

Repositories

Showing 10 of 115 repositories
  • fs2-kafka Public

    Functional Kafka Streams for Scala

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

    Functional Avro for Scala

    typelevel/vulcan's past year of commit activity
    Scala 105 Apache-2.0 38 2 0 Updated Nov 1, 2026
  • mouse Public

    A small companion to cats

    typelevel/mouse's past year of commit activity
    Scala 376 MIT 66 4 3 Updated Nov 1, 2026
  • munit-cats-effect Public

    Integration library for MUnit & cats-effect

    typelevel/munit-cats-effect's past year of commit activity
    Scala 159 Apache-2.0 40 4 3 Updated Nov 1, 2026
  • cats Public

    Lightweight, modular, and extensible library for functional programming.

    typelevel/cats's past year of commit activity
    Scala 5,479 1,241 223 (6 issues need help) 54 Updated Oct 31, 2026
  • simulacrum-scalafix Public

    Simulacrum as Scalafix rules

    typelevel/simulacrum-scalafix's past year of commit activity
    Scala 36 10 6 7 Updated Oct 31, 2026
  • literally Public

    Compile time validation of literal values built from strings

    typelevel/literally's past year of commit activity
    Scala 113 Apache-2.0 6 1 3 Updated Oct 31, 2026
  • cats-time Public

    Cats Instances for Java Time

    typelevel/cats-time's past year of commit activity
    Scala 94 MIT 19 1 4 Updated Oct 31, 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) 5 Updated Oct 31, 2026
  • cats-effect-testing Public

    Integration between cats-effect and test frameworks

    typelevel/cats-effect-testing's past year of commit activity
    Scala 194 Apache-2.0 42 8 15 Updated Oct 31, 2026