# ReactiveX/RxSwift

Reactive Programming in Swift

Repository: https://github.com/ReactiveX/RxSwift
Canonical: https://ross.abutalabs.com/products/rxswift
Language: Swift
License: MIT
License Family: permissive
Topics: swift, reactivex, reactive, ios, unidirectional, observer, functional, rxswift
Last push: 2026-08-15T09:20:08+00:00

## Health v2 (maintenance only)
Score: 85/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 97, release rhythm 60, longevity 100
- inputs: {"age_days": 4166, "days_push": 18, "days_rel": 184, "gap_med": 89, "n_releases_24m": 6}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 24648, forks 4153 (observed 2026-08-28T04:11:37.573211+00:00)

## What it is
RxSwift is the Swift-specific implementation of the Reactive Extensions (Rx) standard, providing Observable streams for composing asynchronous operations and event-driven data flows. It unifies KVO observation, async operations, and UI events under a single sequence abstraction with a Swift-first API.

## Use cases
- compose asynchronous operations in Swift
- handle UI events reactively in iOS apps
- unify KVO, delegates, and callbacks into observable streams
- build unidirectional data flow architectures in Swift
- transform and combine streams of data over time
- replace nested callbacks with declarative async code

## When to choose
- you're building iOS/macOS apps with complex asynchronous or event-driven logic
- you want a mature, battle-tested reactive programming library with a large community
- you need to unify diverse event sources (UI, network, KVO) into one abstraction
- you're already familiar with Rx from other languages like RxJava or RxJS

## When to avoid
- your app has simple async needs better served by Swift's built-in async/await and Combine
- you want to minimize third-party dependencies and binary size
- your team is unfamiliar with reactive programming and the learning curve isn't justified
- you're targeting platforms where Combine is available and sufficient

## Facets
- artifact type: library
- maturity: stable
- function: concurrency, state-management, developer-tools
- domain: mobile-development, cross-platform, programming-languages
- platform: -
- tags: reactive-programming, observables, functional-programming, reactivex, asynchronous, swift, ios, macos, linux

## Member repositories
- ReactiveX/RxSwift (main) score 85

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:37.573211+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 2026-08-29T16:56:10.879167+00:00, confidence not recorded.
  - readme: https://github.com/ReactiveX/RxSwift (fetched 2026-08-28T04:11:37.573211+00:00, sha abde7942a5c1)
- Data as of 2026-08-30T08:39:29.467469+00:00.