Dantrolene

Lock timeouts make sense in an office or a café. At home, they just interrupt: the screen locks mid-movie or mid-paragraph and asks for a password it asked an hour ago. Dantrolene watches which WiFi network you're on — on the network you've designated as home, the idle screen lock never fires; on any other network, locking behaves exactly as configured. The screen still dims and goes dark after your usual timeout — it looks like normal display sleep, and any activity brings it back instantly, with no password prompt. Leave home and the protection is automatically back on the next lock cycle. Set it once from the menu bar and forget it. Requires macOS 26 (Tahoe) or later. Free and open source (MIT) on GitHub; a sandboxed convenience build is available on the Mac App Store.