Tutorials

Build a Session counter on macOS in six lessons, from your first window to events, state, layout, navigation, and a tested app.

• 1. Open your first window

  Install Day and open a localized native window on macOS with AppKit.

• 2. Handle a button click

  Connect a native button to a callback and show a localized response.

• 3. Update state

  Store a count in a signal and bind a localized label to it.

• 4. Arrange the controls

  Combine rows and columns, add spacing, and reset the session counter.

• 5. Navigate between pages

  Add counter and summary sections while keeping shared state above both pages.

• 6. Finish and test the app

  Complete the session counter and verify counting, reset, navigation, and shared state with a dayscript.

• Optional: Try another platform

  Run the completed app with Qt on macOS, then choose another desktop or mobile target.

• AI-assisted development

  Connect Codex or Claude Code to Day, verify changes in a running app, and save tests for CI.