Bitwarden Authenticator is a standalone app that is available for everyone, even non-Bitwarden customers.
In its current release, Bitwarden Authenticator generates time-based one-time passwords (TOTP) for users who want to add an extra layer of 2FA security to their logins.
There is a comprehensive roadmap planned with additional functionality.
Available for iOS and Android
As long as you can access the keys, you can swap authenticator apps.
I tried a few until I landed in Aegis, and I have two on my desktop that I’m trying out as well. Just get something that allows exporting the keys and there will be a path to switching apps.