If safety is your primary concern though, stick with just the command line client, which is a Bash script most HN-readers will be able to follow to the letter. It in turn uses GnuPG.
The lack of integration then with the rest of the OS is actually a security benefit.
It stores your data locally, is suprisingly easy to use and relies on battle tested GPG.
From the website: "The community has even produced a cross-platform GUI client, an Android app, an iOS app, a Firefox plugin, a Windows client, a pretty Python QML app, a nice Go GUI app, an interactive console UI, Alfred integration (1) (2) (3), a dmenu script, OS X integration, git credential integration, and even an emacs package."
[1] https://www.passwordstore.org/