Fastulo: Ring Timer

Fastulo is a fasting timer built around a single, clear idea: you should always know where you stand in your fast at a glance. At the center of the app is an animated ring that fills as your fasting window progresses. No charts to interpret, no numbers to mentally calculate — just a visual arc telling you how far you have come and how much remains. Set your fasting schedule once. Choose from common patterns or define your own fasting and eating windows. The ring starts counting the moment your fast begins. The app works entirely offline. No account, no sync, no server. Everything is stored on your device. Open it, check your ring, close it — that is the whole flow. Features include a PIN lock for privacy, haptic feedback during key moments, multiple view modes for your history, and a simple light/dark/system theme toggle. Date format is configurable between DD/MM/YYYY and MM/DD/YYYY to match your locale. The timer runs in the foreground. The ring is the interface. Nothing is hidden behind menus or cluttered with unnecessary options. If you fast regularly and want something that respects your time and attention, Fastulo is built for that.