I was using this app until I created a new gpg key and OpenKeychain did not work because of this https://github.com/open-keychain/open-keychain/issues/2886. I then installed password store inside termux and I am using it as if I am using it from my PC. That works pretty well.
Since I switched to Wayland, I could not find an alternative for barrier that I used under X. After a lot of search I bumped into a project called rkvm. You can check it out. It is a bit more difficult to setup than barrier but it works pretty well for me.
The only bad thing is that both computers must run linux.
https://wiki.termux.com/wiki/Termux-clipboard-set