2FA Authenticator source code Cloud backup Recomendable Device
Google Authenticator Not sure No No Android
OP, your review on the Google Authenticator as not to be trusted doesn't sit well with me. The simple reason being that I have been using the GA as my 2FA for three years now and I haven't had any issues with all the sites I have used it on. Periodically, I get texts of hackers trying to break into those accounts but without any success. So, I am asking "what is wrong with the GA?" If it has kept hackers off those accounts, it should be trusted. And I believe a lot of users with agree with me on this.
I didn't even know there are also some applications of Two Factor authentication available, so also only using google authenticator and so far its works well and didn't encounter problems except when I lost my phone in one exchange website I actually lock my account because I don't have the google authenticator and there are some websites that don't really offer a recovery or it is going to be a long process to recover it.
It's actually a bit unreliable since the authenticator is only on android and im not really sure if the google extension google authenticator is actually safe to use.