One app for calls and contacts. Nothing else touches it.

Your dialer and your address book were never meant to be two apps.

Google ships a Phone app and a Contacts app. Fossify does too. So does almost everyone else — two separate apps, two separate permission prompts, and a contact list that has to sync between them to work at all. Phone drops that split entirely: the dialer, the call log and the full contact list live in one app, so adding a number, naming it and calling it happen without switching screens.

It also runs completely offline. No account, no cloud contact sync, nothing phoning home to Google or anyone else — your contacts and call history stay on the device they're stored on, which is the whole point if you're trying to degoogle a phone rather than just rearrange which company holds the same data.