Projects
Our projects cover a wide range of domains, from general functional programming to tooling.
case-insensitive
A case-insensitive string for Scala
js / jvm / native
catapult
A thin wrapper for the Launch Darkly Java server SDK using cats-effect and fs2
jvm
catbird
Cats instances for various Twitter Open Source Scala projects
jvm
Cats
A library intended to provide abstractions for functional programming in Scala, leveraging its unique features. Design goals are approachability, modularity, documentation and efficiency.
js / jvm / native
Cats Collections
Data structures that facilitate pure functional programming with cats
js / jvm / native
Cats-Effect
The IO Monad for Scala, plus type classes for general effect types.
js / jvm / native
Cats MTL
Monad transformers made easy
js / jvm / native
cats-parse
A parsing library for the cats ecosystem
js / jvm / native
Cats Tagless
A library of utilities for tagless final algebras
js / jvm / native
Cats-Time
Instances for Cats Typeclasses for Java 8 Time
js / jvm / native
discipline
Originally intended for internal use in spire, this library helps libraries declaring type classes to precisely state the laws which instances need to satisfy, and takes care of not checking derived laws multiple times.
js / jvm / native
doobie
A pure functional JDBC layer for Scala. It is not an ORM, nor is it a relational algebra; it just provides a principled way to construct programs (and higher-level libraries) that use JDBC.
jvm
fabric
Object-Notation Abstraction for JSON, binary, HOCON, etc.
js / jvm / native
Feral
Feral cats are homeless, feral functions are serverless
js / jvm
Frameless
Frameless is a library for working with Spark using more expressive types.
jvm
fs2-grpc
gRPC implementation for FS2/cats-effect
jvm
fs2
FS2 is a library for purely functional, effectful, and polymorphic stream processing library in the Scala programming language. Its design goals are compositionality, expressiveness, resource safety, and speed. The name is a modified acronym for Functional Streams for Scala (FSS, or FS2).
js / jvm / native
Grackle
Functional GraphQL server for the Typelevel stack
js / jvm / native
jawn-fs2
Integration of jawn and fs2 for streaming, incremental JSON parsing
js / jvm / native
keypool
A Keyed Pool Implementation for Scala
js / jvm / native
kind-projector
Plugin for nicer type-lambda syntax
jvm
Kittens
Automatic type class derivation
js / jvm / native
Laika
Site and e-book generator and customizable text markup transformer for sbt, Scala and Scala.js
js / jvm
literally
Compile time validation of literal values built from strings
js / jvm / native
log4cats
Logging Tools For Interaction with cats-effect
js / jvm / native
Mouse
Enrichments to standard library classes to ease functional programming
js / jvm / native
Natchez
functional tracing for cats
js / jvm / native
otel4s
An OpenTelemetry library based on cats-effect
js / jvm / native
ScalaCheck
ScalaCheck is a library for automated property-based testing. It contains generators for randomized test data and combinators for properties.
js / jvm / native
simulacrum
First-class syntax for type classes
js / jvm / native
Simulacrum Scalafix
Simulacrum as Scalafix rules
js / jvm
Skunk
A data access library for Scala + Postgres
js / jvm / native
spire
Spire is a numeric library for Scala which is intended to be generic, fast, and precise. Using features such as specialization, macros, type classes, and implicits, Spire works hard to defy conventional wisdom around performance and precision trade-offs.
js / jvm / native
Squants
The Scala API for Quantities, Units of Measure and Dimensional Analysis
js / jvm / native
Twiddles
Micro-library for building effectful protocols
js / jvm / native
typelevel.g8
A Giter8 template for sbt-typelevel
js / jvm
typelevel-nix
Development tools for Typelevel projects
js / jvm / native
vault
Type-safe, persistent storage for values of arbitrary types
js / jvm / native
