Install

Calendrop runs on macOS 14 or later on a Mac with Apple silicon.

Download

Download Calendrop-0.5.0-macos-arm64.zip
Calendrop v0.5.0. Earlier versions are in the release history.

1. Unzip the download.
2. Move Calendrop.app into the Applications folder.
3. Open it. Calendrop lives in the menu bar; it has no Dock icon.

Allow the first launch

Calendrop is signed by its developer but not notarized by Apple, so the first time you open it macOS refuses with a message that it cannot check the app for malicious software. To allow it:

1. Close the message.
2. Open System Settings › Privacy & Security and scroll down to Security. There is a line saying Calendrop was blocked.
3. Click Open Anyway and confirm with your password or Touch ID.
4. Click Open in the message that follows.

This is needed once per installed copy. After an update, macOS may ask once more.

Homebrew

brew install --cask calendrop-app/tap/calendrop

Update it with brew upgrade --cask calendrop. If macOS refuses to open it, allow it as above.

Updating

Quit Calendrop from its menu, replace Calendrop.app in Applications with the new one, and open it again. Your accounts and settings stay. The first time the new version reads your sign-in, macOS asks for Keychain access again; see Keychain asks again after each update.

Uninstall

1. Open Settings › Accounts and remove each account. This deletes its sign-in token from this Mac’s Keychain. Removing an account removes it from every Mac that shares your settings; to leave the others alone, delete the tokens instead: open Keychain Access and delete the items named Calendrop (your address).
2. Quit Calendrop and move Calendrop.app to the Trash.
3. To delete your settings too, delete the Calendrop folder in iCloud Drive, or ~/Library/Application Support/Calendrop/ if you do not use iCloud Drive. Its preferences are in ~/Library/Preferences/com.lambdalisue.calendrop.plist.
4. To withdraw Calendrop’s access on Google’s side as well, remove it at Google Account › Third-party apps & services.