TuFA, Timed one-time-password (TOTP) application
Made with Angular 12 and Material.
Ready-to-use: https://tufa.cv.co.hu
(you can put to your homescreen on android)
Needs javascript and access to localStorage. Does not send any data to any server, everything is stored locally - which means, if you clear your browsing data or use in incognito, it will lose whatever tokens were added, so be aware.