monix/monix

Health v2 · maintenance only

Adoption not part of the score

1928 stars · 243 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Monix is a high-performance Scala and Scala.js library for composing asynchronous, event-based programs, offering data types like Observable, Task, Coeval, and Iterant. It is a Typelevel project that implements ReactiveX with functional programming principles, back-pressure support, and Reactive Streams compatibility, and was one of the parents of Cats Effect.

Use cases

• compose asynchronous event-based programs in Scala
• build reactive streaming pipelines with back-pressure
• replace Scala Future with a principled Task for effect management
• handle resource acquisition and release safely in async code
• stream data pull-based with Iterant
• write code that runs on both JVM and JavaScript via Scala.js
• manage concurrency with purely functional primitives like MVar and Circuit Breaker

When to choose

• you need ReactiveX-style observables in Scala with strong FP foundations
• you want Reactive Streams compatibility and back-pressure out of the box
• you are on the Typelevel stack (Cats, Cats Effect 2.x) and need Task/Observable abstractions
• you need cross-compilation between JVM and Scala.js

When to avoid

• you are starting a new project on Cats Effect 3.x, where fs2 and CE3 idioms are the standard
• you only need simple futures without effect abstractions
• you want a library with rapid ongoing development, as Monix is largely in maintenance mode

Facets

library · maturity maintenance

concurrency streaming developer-tools backend cross-platform jvm cross-platform reactive-streams cats-effect typelevel observable task backpressure scala-js functional-programming reactive-programming javascript

Member repositories

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