I used to use "pass" like others here, but did not like the Android experience.
*edited to add: and we use the 1Password team account at my day job -- and are satisfied customers. I'm sure other products work well too -- just my one data point.
afaict, the 1password cli app is just a client for their API and has no offline mode, so if I can't reach 1password's servers, I can't access any of my secrets.
I believe the browser addons do not share this shortcoming, though.