Completed the initial setup of [pass] on Macos Big Sur, this is after BitWarden locked me out half a day because apparently I had "network issues", but that seems highly doubtful.
Anyway that shook my faith in Bitwarden, so I searched for an alternative and I'm pretty happy with [pass]. It's simple, no-nonsense. In a nutshell it's front end for a git repo + gpg to handle encryption.
Bascially if your client side can reach/interact with a git repo and works with GPG (2.2 for Android/OpenKeyChain, see below.) we're in business.