# ReactiveX/RxKotlin

RxJava bindings for Kotlin

Repository: https://github.com/ReactiveX/RxKotlin
Canonical: https://ross.abutalabs.com/products/rxkotlin
Language: Kotlin
License: Apache-2.0
License Family: permissive
Topics: kotlin, rxjava
Last push: 2023-10-16T06:34:13+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4397, "days_push": 1052, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 7029, forks 456 (observed 2026-08-28T04:09:55.043786+00:00)

## What it is
RxKotlin is a lightweight library of Kotlin extension functions for RxJava, streamlining reactive programming on the JVM. It centralizes idiomatic Kotlin conveniences like toObservable() and named-argument subscribers for RxJava 3.x.

## Use cases
- convert collections and iterables into observables with idiomatic Kotlin
- reduce boilerplate when subscribing to RxJava streams
- use named arguments for onNext, onError, and onComplete handlers
- write reactive asynchronous code on the JVM or Android in Kotlin
- standardize RxJava usage conventions across a Kotlin codebase

## When to choose
- you use RxJava with Kotlin and want less boilerplate via extension functions
- you are building reactive Android or JVM applications in Kotlin
- you want a centralized, conservative set of Kotlin idioms for RxJava 3.x

## When to avoid
- you prefer Kotlin coroutines and Flow over RxJava-style reactive streams
- you need new features for RxJava 1.x or 2.x, which are end-of-life or in maintenance mode
- you are not using RxJava at all

## Facets
- artifact type: library
- maturity: maintenance
- function: concurrency, developer-tools
- domain: developer-tools, programming-languages
- platform: jvm
- tags: reactive-programming, rxjava, kotlin-extensions, observables, android

## Member repositories
- ReactiveX/RxKotlin (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:55.043786+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:40:35.678588+00:00, confidence not recorded.
  - readme: https://github.com/ReactiveX/RxKotlin (fetched 2026-08-28T04:09:55.043786+00:00, sha 2308e3443cb6)
- Data as of 2026-08-30T08:39:29.467469+00:00.