For Android, Aegis. You can get it it on Play, on one of the numerous *-Droid sources or straight from GitHub with Obtanium.
Simple to use, open source, does encrypted exports which I regularly backup (along with Bitwarden and SimpleNotes exports) to one of these (Amazon link). It's perfect for me.
Moved to Raivo earlier this year and it’s great. Unfortunately it was just sold to a private company, so I’m looking for alternatives. From the replies here, might try 2FAs