I've been using Bitwarden's clients (browser extension, mobile apps, desktop apps) with a self-hosted vaultwarden [1] server. It's marginally free if you are already self-hosting other stuff. I'm hosting it on a raspberry pi 4b at home and exposing it to public Internet through Cloudflare zero trust (also free). Had no problems so far.
[1] https://github.com/dani-garcia/vaultwarden, note that it's different from Bitwarden's official server (https://bitwarden.com/help/install-on-premise-linux/), uses less CPU/memory, and enables premium features like TOTP for free.