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Typelevel

We do functional programming together!
README.md

Typelevel is an ecosystem of projects and a community of people united to foster an inclusive, welcoming, and safe environment around functional programming in Scala. Also find us on...

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  1. cats cats Public

    Lightweight, modular, and extensible library for functional programming.

    Scala 5.4k 1.2k

  2. fs2 fs2 Public

    Compositional, streaming I/O library for Scala

    Scala 2.4k 622

  3. scalacheck scalacheck Public

    Property-based testing for Scala

    Scala 2k 400

  4. spire spire Public

    Powerful new number types and numeric abstractions for Scala.

    Scala 1.8k 240

  5. cats-effect cats-effect Public

    The pure asynchronous runtime for Scala

    Scala 2.2k 565

  6. discipline discipline Public

    Flexible law checking for Scala

    Scala 334 58

Repositories

Showing 10 of 110 repositories
  • natchez Public

    functional tracing for cats

    typelevel/natchez’s past year of commit activity
    Scala 338 MIT 77 16 12 Updated Jan 28, 2026
  • otel4s Public

    An OpenTelemetry library for Scala based on Cats-Effect

    typelevel/otel4s’s past year of commit activity
    Scala 204 Apache-2.0 45 14 (2 issues need help) 6 Updated Jan 28, 2026
  • log4cats-natchez Public

    log4cats backend that provides a Logger[F] given a Trace[F] from Natchez

    typelevel/log4cats-natchez’s past year of commit activity
    Scala 1 Apache-2.0 2 0 8 Updated Jan 28, 2026
  • idna4s Public

    Cross-platform Scala implementation of Internationalized Domain Names in Applications

    typelevel/idna4s’s past year of commit activity
    Scala 7 MIT 4 6 6 Updated Jan 28, 2026
  • twiddles Public

    Micro-library for building effectful protocols

    typelevel/twiddles’s past year of commit activity
    Scala 69 BSD-3-Clause 4 1 0 Updated Jan 27, 2026
  • doobie Public

    Functional JDBC layer for Scala.

    typelevel/doobie’s past year of commit activity
    Scala 2,209 MIT 377 125 5 Updated Jan 27, 2026
  • vault Public

    Type-safe, persistent storage for values of arbitrary types

    typelevel/vault’s past year of commit activity
    Scala 82 MIT 20 1 0 Updated Jan 27, 2026
  • keypool Public

    A Keyed Pool Implementation for Scala

    typelevel/keypool’s past year of commit activity
    Scala 39 MIT 16 8 8 Updated Jan 27, 2026
  • mouse Public

    A small companion to cats

    typelevel/mouse’s past year of commit activity
    Scala 376 MIT 66 4 4 Updated Jan 27, 2026
  • skunk Public

    A data access library for Scala + Postgres.

    typelevel/skunk’s past year of commit activity
    Scala 1,639 MIT 166 77 (2 issues need help) 9 Updated Jan 27, 2026
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Sponsors

  • @yoshinorin
  • @a-nigredo
  • @DavidGregory084
  • @lhns
  • @BalmungSan
  • @b-vennes
  • @lorandszakacs
  • @andrew-selvia
  • Private Sponsor