No sign-up, no email verification, no waiting for cloud sync. Open Gastify, log the amount, done — your data stays on your iPhone, not on a server.
There's no sign-up or login. Open the app and start using it.
Everything is stored locally on the device. You can lock access with Face ID or Touch ID.
Only the amount is required. Category, note and receipt are optional, so it never slows you down mid-day.