# ReactKit/ReactKit

Swift Reactive Programming.

Repository: https://github.com/ReactKit/ReactKit
Canonical: https://ross.abutalabs.com/products/reactkit
Language: Swift
License: MIT
License Family: permissive
Last push: 2015-09-23T05:36:44+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": 4356, "days_push": 3997, "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 1190, forks 40 (observed 2026-08-28T04:03:56.046785+00:00)

## What it is
ReactKit is a Swift framework for reactive programming, providing stream-based bindings for Key-Value Observing, NSNotification, and target-action events. It lets developers compose and bind event streams declaratively, e.g. linking text field changes to button state.

## Use cases
- bind UI events to state reactively in Swift
- observe property changes via KVO with streams
- combine multiple text field inputs to enable a button
- transform NSNotification streams with map operators
- replace delegate-based event handling with stream bindings

## When to choose
- building an older Swift 2.x iOS/macOS app that wants lightweight FRP without heavy dependencies

## When to avoid
- starting a new Swift project - the library is unmaintained since 2015 and incompatible with modern Swift
- you need Combine, RxSwift, or async/await-based reactive patterns
- you need long-term support or recent iOS platform features

## Facets
- artifact type: library
- maturity: abandoned
- function: state-management, ui-components
- domain: mobile-development
- platform: -
- tags: reactive-programming, kvo, streams, functional-reactive-programming, swift, ios, macos

## Member repositories
- ReactKit/ReactKit (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:56.046785+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 2026-08-30T06:23:00.220916+00:00, confidence not recorded.
  - readme: https://github.com/ReactKit/ReactKit (fetched 2026-08-28T04:03:56.046785+00:00, sha c0c0c4dd7b43)
- Data as of 2026-08-30T08:39:29.467469+00:00.