If proprietary app is better and more robust I am willing to try it and assess it myself.
“Authenticator key (TOTP) storage is available to all accounts. TOTP code generation requires premium or membership to a paid organization (families, teams, or enterprise).”
It’s $10/y and a steal for that excellent software. I pay it and self host it just to support them.
I’m aware. So is Bitwarden if you don’t use their web vault, which KeepassXC does not have. Keepass can use a cloud drive to sync multiple devices whereas Bitwarden requires a self hosted instance to sync. Personally I would rather trust my own hosted instance over that of a cloud provider. But that all depends on your threat model and who you’re willing to trust. Having used both I personally prefer self hosted Bitwarden.
This!
Keepassxc is cross-platform, free and open-source. It has also options for iOS and Android.