Get the BusyBlocks app
The apps load the same calendar as the website, so everything stays in sync. Sign in the same way you do in a browser.
macOS
Disk image for Apple Silicon Macs.
The app is signed but not notarised. If macOS says it is damaged, run xattr -cr /Applications/BusyBlocks.app once, then open it. If it only says the developer cannot be verified, right-click the app and choose Open.
Download .dmgWindows
Installer for Windows 10 and 11.
The installer is not code-signed. If SmartScreen warns, choose More info, then Run anyway.
Download .exeLinux
AppImage, runnable without installation.
Make it executable, then run it. No signing is needed for AppImage.
Download AppImageAndroid
APK, installed directly rather than through a store.
Allow your browser or file manager to install unknown apps, then open the downloaded APK.
Download .apkVersion 0.1.126. Every build loads the same calendar as the website.