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Run a deliberate long fast from 24 to 168 hours, with hour-by-hour stage content and milestone callouts.
The web app works on iPhone, Android, desktop, and tablet — same experience everywhere. Prefer a home-screen icon and native notifications on Android? Get the Android app instead.
The Extended Fasting Tracker runs sessions from 24 up to 168 hours (one to seven days). Quick-select presets are 48h, 60h, and 72h; the slider covers everything in between and beyond in hour increments. If you're already fasting when you open the app, Start in Past lets you backdate the start by up to the fast length minus one hour, so the timer matches real elapsed time.
You can only run one fast at a time — the Extended Fasting Tracker and the Intermittent Fasting Tracker are mutually exclusive. Starting an extended fast takes over the timer until you end or cancel it.
A large count-up timer, your target duration, and percent complete. Past roughly the first day, the screen also surfaces content from our fasting library: a short stage description, body-state notes, and milestone callouts for entering ketosis, autophagy, and deeper fat-burning phases. A motivator rotation cycles short prompts in to break up long viewing stretches.
Completed and cancelled extended fasts are saved to your history with duration and date range. There is no mid-fast resume — if a session ends, you start a new one. There is also no automatic daily restart: Extended is for deliberate one-off sessions, not a repeating loop.
Decide the length before you start and stick to it, so you are not negotiating with yourself at hour 30. Treat milestone content as orientation, not prescription. Break the fast with a controlled first meal rather than a reward meal, and return to normal tracking the next day.
Presets for the common durations, a slider for everything else up to seven days.
Start in Past lets you log the real start time, not when you happened to open the app.
Stage descriptions and callouts for ketosis, autophagy, and fat-burning milestones from the fasting library.
Completed fasts are saved. There is no mid-fast resume, so plan the length before you start.
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Extended Fasting Tracker
The web app works on every device, including iPhone. Android users can also install the native app from the Play Store.
For most healthy adults, yes. Start with 24 hours first, assess how your body responds, and extend from there. Consult a doctor if you have any underlying health conditions.
Glycogen stores become significantly depleted and your body increases reliance on fat for fuel. Many people report reduced hunger and improved mental clarity after the initial adjustment period.
Light movement like walking is fine. Avoid intense training during long fasts - your body is under significant metabolic stress and recovery capacity is reduced.
Use them sparingly and strategically - not as a weekly routine. Once or twice a month as a reset tool is a common approach.
No. Execution quality and recovery planning matter more than extreme duration. A clean 24-hour fast with a structured refeed beats a chaotic 60-hour fast every time.
Pre-plan your refeed meal before the fast begins. Keep it simple and measured. Return to normal tracking immediately after - treat the refeed as day one, not a reward.
Many people find longer fasts easier when they pay attention to electrolytes, especially as sessions get closer to 36 to 60 hours. The exact need varies by person, duration, climate, and activity level. What matters is that dizziness, weakness, and headaches are not something to romanticize as proof the fast is working.
Look at the whole pattern, not just the scale. If the fast gives you more control, cleaner eating afterward, and better adherence over the next several days, it is probably serving a purpose. If it leads to obsession, rebound eating, poor sleep, or repeated crashes, it is probably creating more friction than value.
It gives you context during a long session. A 30-hour fast can feel endless if you have no reference point. Seeing where you are in the timeline helps reduce vague mental strain and makes the session feel more structured and deliberate.
Muscle building during a deficit is limited but possible - especially for beginners. The main goal with protein during fasting is preservation, not growth. Adequate protein intake is the key variable.
Free intermittent fasting tracker — pick a window, run it with a live timer, and keep a rolling record of what you actually did.
Run a deliberate long fast from 24 to 168 hours, with hour-by-hour stage content and milestone callouts.
Free weight tracker — log daily, edit recent entries inline, and see 7, 30, or 180 days at a glance.
Free walking tracker — start a timer, pick your pace, and let pause/resume handle real-life interruptions.
Free calorie tracker — log meals once, save them to My Foods, and watch your daily remaining calories update live.
The structured challenge mode — set a goal weight, pick 30 to 180 days, and the app aggregates every food, walking, and weight entry into one timeline. Unlocked with sponsorship.