Jerboa should be the recommendation based on what you are looking for.
Open source, saw someone else mention they got it on whatever F-droid is, stable af (0 crashes on pixel5).
Bonuses, it has buttons, looks clean, runs smooth, swiping isn’t obsfucating UX/UI as it does expected things like going back. (wefwef is painful if you can’t get behind IOS UI chicanery)
RememBear is or not sure exactly what your response is regarding, sorry.
That said RememBear is technically less secure than an option where you host and manage your data yourself (provided you do it well!). But personally I think their method is sound enough for me.
Jerboa should be the recommendation based on what you are looking for.
Open source, saw someone else mention they got it on whatever F-droid is, stable af (0 crashes on pixel5).
Bonuses, it has buttons, looks clean, runs smooth, swiping isn’t obsfucating UX/UI as it does expected things like going back. (wefwef is painful if you can’t get behind IOS UI chicanery)