Fast smarter. Know what's happening inside your body.

Intermittent fasting is generally safe for healthy adults. For extended fasts beyond 24 hours, QoFast provides structured preparation and refeeding guidance to help you fast safely. Always consult your doctor before starting a new fasting regimen, especially if you have underlying health conditions.

QoFast is the only app built specifically for both intermittent and extended fasting with a full prep-fast-refeed cycle. Our 13 body milestones show you exactly what's happening physiologically during your fast, and extended fasting mode guides you through preparation and refeeding phases.

Yes — QoFast is one of the few apps designed specifically for extended fasts of 3, 5, or 7 days. Premium includes structured preparation phases, fasting guidance, and step-by-step refeeding plans to break your fast safely.

QoFast tracks 13 physiological milestones during your fast: blood sugar changes, entering fasting mode, glycogen depletion, fat burning acceleration, ketosis, ketone body rise, growth hormone increase, autophagy, lowest insulin, immune regeneration, and more. Each milestone includes an explanation of what's happening in your body.

Yes. The fasting timer works completely offline — it calculates your progress from a saved start time, so it survives app kills, device restarts, and airplane mode. Your data syncs when you're back online.

Of course. There are no contracts or commitments. You can cancel your Premium subscription anytime, and you'll keep access until the end of your billing period.