FreeOTP (Authenticator)

★★★☆☆

Extremely bare-bones two-factor authentication app for iOS and Android, sponsored by Red Hat. It’s secure, works offline, and doesn’t depend on Google. Free and open source. You can add, rename, rearrange or remove accounts (ARRR!), but that’s about it.

Unfortunately, it doesn’t have a good way to import codes from another app, on the same device or another. And it doesn’t seem to recognize the multi-account QR codes Google Authenticator can export. (It does have its own encrypted backup/restore feature, at least.) If you already have a lot of 2FA codes, switching them one by one will be tedious.

Tuta recommended it in their latest Degoogling round-up, along with Aegis Authenticator, which made a much better impression with its solid import/export and the ability to organize accounts into groups.