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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

Find us on...

🌐 typelevel.org 💬 Discord 🦋 Bluesky 🐘 Mastodon 📺 YouTube 🌟 Luma 👔 LinkedIn 🩷 GitHub Sponsors

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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 2.2k 580

  6. discipline discipline Public

    Flexible law checking for Scala

    Scala 338 60

Repositories

Showing 10 of 115 repositories
  • feral Public

    Feral cats are homeless, feral functions are serverless

    typelevel/feral's past year of commit activity
    Scala 195 Apache-2.0 52 31 (4 issues need help) 46 Updated Oct 5, 2026
  • scalacheck Public

    Property-based testing for Scala

    typelevel/scalacheck's past year of commit activity
    Scala 1,964 BSD-3-Clause 392 56 (1 issue needs help) 19 Updated Oct 5, 2026
  • typelevel.g8 Public

    A typelevel.g8 based on sbt-typelevel

    typelevel/typelevel.g8's past year of commit activity
    Scala 14 6 8 5 Updated Oct 5, 2026
  • .github Public

    a ✨special ✨ repository for project defaults and organization readme

    typelevel/.github's past year of commit activity
    1 6 0 0 Updated Oct 5, 2026
  • typelevel.github.com Public

    typelevel.org website

    typelevel/typelevel.github.com's past year of commit activity
    HTML 42 113 23 12 Updated Oct 5, 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 Oct 5, 2026
  • mouse Public

    A small companion to cats

    typelevel/mouse's past year of commit activity
    Scala 376 MIT 66 4 3 Updated Oct 4, 2026
  • vulcan Public

    Functional Avro for Scala

    typelevel/vulcan's past year of commit activity
    Scala 104 Apache-2.0 38 2 0 Updated Oct 4, 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) 4 Updated Oct 4, 2026
  • fs2-kafka Public

    Functional Kafka Streams for Scala

    typelevel/fs2-kafka's past year of commit activity
    Scala 316 Apache-2.0 112 1 0 Updated Oct 2, 2026

Sponsors

  • @stasimus
  • @antoniojimeneznieto
  • @vladimir-popov
  • @rtyley
  • @yoshinorin
  • @a-nigredo
  • @DavidGregory084
  • @lhns
  • @BalmungSan
  • @lorandszakacs
  • Private Sponsor

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