Kvart (from Swedish "kvart", meaning "quarter") is a visual timer app built with a Rust Crux core and a native iOS (SwiftUI) shell. It does one thing and does it well: it helps you keep track of time in set intervals.
Kvart is available on the Apple App Store for iOS devices and can be downloaded for free.
Android version is planned for the near future.
App contains in-app purchases to unlock additional themes for a minimal one-time fee to support development.
Kvart combines a shared Rust core (using Crux) with a native iOS shell. The core owns all domain logic, state, and view projections; the shell stays thin with native views and capabilities.
- Rust with the
wasm32-unknown-unknowntarget (rustup target add wasm32-unknown-unknown) - just task runner
- xcodegen and cargo-swift v0.9.0
- Xcode with iOS Simulator — follow Apple's setup guide for your iOS development environment
./shared— Rust/Crux core (domain types, events, purehandle()logic, view models)./apple— iOS SwiftUI shell consuming the generated Swift bindings
From ./shared, validate and test the core:
just dev # fix → check → build → testFrom ./apple, generate bindings, build, and run on the iOS Simulator:
just generate # typegen → package → xcodegen
just build # xcodebuild for the Kvart schemeSee CLAUDE.md for the full core-first workflow and conventions.
Kvart is free and open source software, if you find it useful you could consider supporting its development:
