1. Download Crossway.zip and unzip it (double-click).
2. Drag Crossway.app into your /Applications folder.
3. Open it. Crossway lives in the menu bar, so you won't see a dock icon.
4. Grant the two permissions it asks for in System Settings → Privacy & Security: Accessibility (to take over ⌘Tab and raise the window you pick) and Screen Recording (for the window previews).
5. Choose the final Startup options. Launch at login starts on; Auto-update stays off unless you choose it. Once both permissions are granted, Crossway finishes setting up on its own.

Requires macOS 14 to 27. Runs on Apple Silicon and Intel.