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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 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 2.3k 586

  6. discipline discipline Public

    Flexible law checking for Scala

    Scala 338 60

Repositories

Showing 10 of 117 repositories
  • fs2 Public

    Compositional, streaming I/O library for Scala

    typelevel/fs2's past year of commit activity
    Scala 2,456 633 107 (7 issues need help) 45 Updated Nov 5, 2026
  • twiddles Public

    Micro-library for building effectful protocols

    typelevel/twiddles's past year of commit activity
    Scala 70 BSD-3-Clause 4 0 1 Updated Nov 4, 2026
  • 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) 27 Updated Nov 4, 2026
  • steward Public

    Runs Scala Steward for Typelevel projects

    typelevel/steward's past year of commit activity
    6 15 0 2 Updated Nov 4, 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 4, 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 4, 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 4, 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) 3 Updated Nov 4, 2026
  • jawn Public

    Jawn is for parsing jay-sawn (JSON)

    typelevel/jawn's past year of commit activity
    Scala 436 73 12 5 Updated Nov 4, 2026
  • 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 4, 2026