Hi, yes, I understand - there are no extension or mobile clients available yet. Wanted to see if people would actually be interested in this kind of product before committing to that kind of development. Thank you for the feedback!
Forgot to mention; the application itself https://www.cryptex-vault.com/app is a PWA - meaning, android (chrome, firefox) or iOS (Safari) will let you install it and use it as a standalone application.