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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 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 585

  6. discipline discipline Public

    Flexible law checking for Scala

    Scala 338 61

Repositories

Showing 10 of 117 repositories
  • cats-tagless Public

    Library of utilities for tagless final encoded algebras

    typelevel/cats-tagless's past year of commit activity
    Scala 321 Apache-2.0 42 9 (4 issues need help) 5 Updated Nov 9, 2026
  • weaver-test Public

    A test framework that runs everything in parallel.

    typelevel/weaver-test's past year of commit activity
    Scala 87 18 25 8 Updated Nov 9, 2026
  • cats-collections Public

    Data structures for pure functional programming in Scala

    typelevel/cats-collections's past year of commit activity
    Scala 564 108 15 (1 issue needs help) 12 Updated Nov 9, 2026
  • fs2-kafka-vulcan Public

    Functional Avro on Kafka for Scala

    typelevel/fs2-kafka-vulcan's past year of commit activity
    Scala 0 Apache-2.0 0 0 0 Updated Nov 9, 2026
  • jawn Public

    Jawn is for parsing jay-sawn (JSON)

    typelevel/jawn's past year of commit activity
    Scala 436 73 12 7 Updated Nov 9, 2026
  • fs2 Public

    Compositional, streaming I/O library for Scala

    typelevel/fs2's past year of commit activity
    Scala 2,456 633 106 (7 issues need help) 43 Updated Nov 9, 2026
  • grackle Public

    Grackle: Functional GraphQL for the Typelevel stack

    typelevel/grackle's past year of commit activity
    Scala 189 Apache-2.0 33 23 7 Updated Nov 9, 2026
  • fs2-kafka Public

    Functional Kafka for Scala

    typelevel/fs2-kafka's past year of commit activity
    Scala 316 Apache-2.0 114 1 0 Updated Nov 9, 2026
  • vulcan Public

    Functional Avro for Scala

    typelevel/vulcan's past year of commit activity
    Scala 107 Apache-2.0 38 1 0 Updated Nov 9, 2026
  • doobie Public

    Functional JDBC layer for Scala.

    typelevel/doobie's past year of commit activity
    Scala 2,226 MIT 376 126 9 Updated Nov 8, 2026