Lock any Mac app with Touch ID. Messages, Photos, whatever you want private. One tap, done. https://appish.app/lockish

I kept handing my MacBook to mates and immediately thinking "please don't open Messages." macOS lets you lock the whole machine but there's no way to lock individual apps. I looked for a solution and nothing existed that wasn't clunky or subscription-based. So I built Lockish — pick the apps you want locked, authenticate with Touch ID to open them. That's it. I use it every day now, especially for Messages, Photos and banking apps. It's a one-time purchase, no subscriptions, and it just works quietly in the background.