Skip to content


Let the Scala compiler work for you.

Let the Scala compiler work for you. We provide type classes, instances, conversions, testing, supplements to the standard library, and much more. Also find us on...


  1. cats Public

    Lightweight, modular, and extensible library for functional programming.

    Scala 4.8k 1.2k

  2. fs2 Public

    Compositional, streaming I/O library for Scala

    Scala 2.1k 545

  3. scalacheck Public

    Property-based testing for Scala

    Scala 1.8k 389

  4. spire Public

    Powerful new number types and numeric abstractions for Scala.

    Scala 1.7k 247

  5. cats-effect Public

    The pure asynchronous runtime for Scala

    Scala 1.6k 434

  6. discipline Public

    Flexible law checking for Scala

    Scala 318 49


Top languages


Most used topics