redbadger/crux

Health v2 · maintenance only

Adoption not part of the score

2705 stars · 113 forks observed · 2026-08-28

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

Crux is a Rust framework for cross-platform app development that shares business logic in a single Rust core across iOS, Android, and web. Native shells (SwiftUI, Jetpack Compose, React, etc.) provide the UI, with generated type-safe interfaces and managed, testable effects between core and shell.

Use cases

• build a mobile app with shared Rust business logic
• share app behavior across iOS, Android, and web
• write fast user journey tests without a device or emulator
• keep UI thin in SwiftUI or Jetpack Compose while logic lives in Rust
• generate type-safe Swift, Kotlin, and TypeScript bindings from Rust types
• make side effects explicit and testable in app architecture

When to choose

• you want one Rust core powering apps on multiple platforms
• your team values testability and strict separation of logic, UI, and effects
• you prefer native UI toolkits over a fully Rust-rendered UI
• you need cross-language type safety at the core/shell boundary

When to avoid

• you need a stable 1.0 API — Crux is pre-1.0 with occasional breaking changes
• you want a fully Rust UI across platforms rather than thin native shells
• your team has no Rust expertise
• you're building a simple single-platform app where a shared core adds overhead

Facets

framework · maturity active

mobile-framework web-framework serialization testing sdk mobile-development web-development cross-platform developer-tools rust cross-platform jvm shared-core ffi swiftui jetpack-compose react type-generation elm-architecture side-effect-management ios android web-server swift typescript

Member repositories

For agents

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