IQfasting runs entirely in your browser. Closing the tab and reopening it later picks up where you left off. There is no signup wall, no analytics that identify you, no record of your fast on a server somewhere. When you want a copy, you can export the whole dataset to a JSON file from the Track tab.

Many use intermittent fasting to simplify eating, support metabolic health, and feel sharper through the day. Research suggests benefits around insulin sensitivity, cellular cleanup, and inflammation when fasting is paired with nutritious meals and good sleep — though individual results vary widely.

Intermittent fasting (typically 12–18 hours daily) is widely considered sustainable for healthy adults. Prolonged fasts (24h+) trigger deeper changes like increased autophagy and ketone production, but they also carry more risk and benefit from professional guidance, especially after the first day.

Hydrate well. Salt your water lightly on longer fasts to support electrolytes. Sleep enough. Move, but don't grind. Break fasts gently — small, mineral-rich foods first, then build back up. Listen to your body louder than any timer.

If you are pregnant or breastfeeding, under 18, underweight, have diabetes or an eating-disorder history, or take medication that depends on food, talk to a clinician before fasting. There is no badge of honor in pushing through real warning signs.

The Longevity protocol page walks through one full multi-day fast with checklists, charts, and PubMed references. The Track tab lets you compare cycles over time. We're adding clarity, Ramadan, athletic, and weight-loss tracks next.