This! I’m using Strongbox on macOS and iOS and it’s just sooo good. It integrates with Apple’s AutoFill API and feels native - just like Apple’s Passwords app. But all the entries are in a KeePass database which I can sync via SyncThing, iCloud, Dropbox, whatever. And if the application should fail, I can use any other KeePass-compatible app or KeePass itself to get to my secrets.