FastJoy: Fasting Tracker

Track your fasting window the simple, private way. Pick a protocol, start the timer, build streaks. Offline, no account, no paywall on the core timer.

FastJoy is the simple, private way to track intermittent fasting. Pick a protocol, start the timer, and watch your fasting and eating windows in real time — no account, no paywall on the core timer, and everything stays on your device.

WHY FASTWINDOW

• Beautiful animated fasting timer with live elapsed time and progress ring
• Choose 16:8, 18:6, 20:4, OMAD or a custom fasting window
• Informational fasting stages as the hours add up (fat burning, ketosis, autophagy zone)
• Current streak, today's eating window and target end time at a glance
• Edit your start time anytime — perfect when you forget to hit start

TRACK EVERYTHING

• Full history of every fast with met-goal status
• GitHub-style consistency heatmap of your fasting days
• Weekly fasting hours and calendar overview

STATS & PROGRESS

• Average fast length, longest fast, completion rate and streaks
• Fast-duration trend chart and this-week-vs-last comparison
• Patterns by weekday and start time of day
• Optional weight log with a clean trend chart
• Dozens of achievements to keep you motivated

REMINDERS THAT HELP

• Get notified the moment your fasting goal is reached
• Optional "time to start fasting" and hydration reminders
• 100% local notifications — no servers, no tracking of your habits

PRIVATE BY DESIGN

• No sign-up, works fully offline
• Optional Face ID / Touch ID lock
• Export and import your data as JSON anytime
• Available in English, Spanish, French, Italian, German and Portuguese

FastJoy is a tracking aid only and does not provide medical or nutritional advice. Intermittent fasting is not suitable for everyone, including during pregnancy or with certain medical conditions. Consult a qualified healthcare professional before changing your eating patterns.

Start your first fast today and build a routine that lasts.