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
How so? They already have TOTP built-in to the app if you pay for premium, so this is just a free competitor to their own offering.
I’m guessing they’re trying to make it a “gateway” to getting people on Bitwarden. Start with the TOTP app, then use the password manager, then pay for premium. Or something like that.