Sibling posts have pretty much answered it already. If you want to really overgeneralize it, it blew my mind a mere few weeks ago when I finally came to the rea

Sibling posts have pretty much answered it already. If you want to really overgeneralize it, it blew my mind a mere few weeks ago when I finally came to the realization after all these years that TOTP is nothing more than an initial seed value, as one half, combined with the current time as the other seed half. I had a huge jackie chan meme moment at that point. Then I realized that, all along, my password manager has a feature to store TOTP, and there is not even a strict need to use all these authenticator apps. (Of course, as someone who strives to exercise some security mindfulness, I reckon it undermines much of the overall point of TOTP to keep it within the same datastore as your account password.)