How do I save my Zwift username and password on macOS?

On Microsoft Windows, you can save your Zwift credentials (your username and password) into the "Internet Settings" keystore, but on Mac, things are different. 

Zwift on Mac, by-default, does not let you save your credentials anywhere that it can use when you launch the app, but David A. Desrosiers (aka "setuid") has written a detailed HOWTO that uses Automator on Mac to do just that!

HOWTO: Fully automated Zwift login on Mac OS X

Not only does it auto-log into Zwift for you with a double-click of the icon, but it also securely stores the password in the Mac OS X "Keychain", an encrypted key store that will protect those credentials for you! 

If you want to change the icon of the Automator script after you create it for Zwift, he's created a useful YouTube video that describes that process too!