iPhone: search FlowState QSR in the App Store, or go to flowstateqsr.com/android and tap the App Store button.
Android: go to flowstateqsr.com/android and tap Download for Android. Your phone asks permission once before installing an app you downloaded yourself, and that page walks you through it. It takes about a minute.
Any device at all: FlowState runs in any browser. Go to flowstateqsr.com and sign in. On a phone your browser will offer to add it to the home screen, where it opens like the installed app.
Updates
The app tells you when a new version is ready. On iPhone it sends you to the App Store; on Android it brings you back to the download page to install the new file over the top. Your sign-in and everything in the app stay as they are.
Setting up a whole crew? Text them flowstateqsr.com/android. Everyone taps the same button on their own phone, and nobody needs an account with us just to download it.