Cysharp/R3

Health v2 · maintenance only

Adoption not part of the score

3969 stars · 182 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

R3 is a modern reimplementation of Reactive Extensions (Rx) for .NET, succeeding dotnet/reactive and UniRx with a redesigned core focused on in-memory event messaging. It supports many platforms including Unity, Godot, Avalonia, WPF, WinForms, WinUI3, MAUI, Blazor, and more, with frame-based operations and improved performance.

Use cases

• handle event streams in C# applications
• replace UniRx in Unity game projects
• reactive UI bindings in WPF or Avalonia
• frame-based timing operations in game engines
• modern Rx alternative for .NET with better performance
• compose observable event pipelines without scheduler overhead

When to choose

• building games or apps on .NET platforms needing reactive event handling
• migrating from UniRx or dotnet/reactive to a modern, faster Rx
• you need frame-based operations in Unity or Godot
• you want Rx aligned with modern C# features

When to avoid

• you need backpressure and distributed reactive streams - use IAsyncEnumerable, Channels, or Reactive Streams instead
• single asynchronous operations - use async/await directly
• projects locked to the classic System.Reactive API surface

Facets

library · maturity active

middleware concurrency developer-tools developer-tools cross-platform backend dotnet cross-platform game-engine windows reactive-extensions rx unirx csharp event-streams linq-to-events game-engine observables game-development web-server

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