Get the app
Install it, add your supplements and that is it. No account, no sign-up, nothing to configure.
Android
Supli is in open beta on Google Play. Anyone can join.
The beta link goes live here in a few days.
Works on Android 7 and newer.
iPhone
The iOS version is being prepared for TestFlight.
Coming soon.
About your data
Supli keeps everything on this phone and nothing leaves it. If you switch phones, export a backup from Settings first.