Live on your line.
Leptin is the calm companion for the lifestyle between eating and fasting — fast with confidence, eat with intention, and move with your body, not against it.
Or get the app
Leptin is the calm companion for the lifestyle between eating and fasting — fast with confidence, eat with intention, and move with your body, not against it.
Or get the app
Sixteen hours fasting, eight to eat — your line, drawn daily.
Leptin is more than a fasting timer. It coordinates when you eat, what you eat, and how you move — one adaptive plan that bends when real life intervenes.
Track your fasts through 8 metabolic phases, from post-meal to deep ketosis. Know what's happening in your body at every hour — and what to do about it.
Break your fast with intention. Clear guidance on what to reach for, what to skip, and simple meal templates that carry your fast's gains forward.
Movement matched to your fasting state — gentle walks deep into a fast, energizing sessions when you're fueled. Never the wrong workout at the wrong hour.
Your AI coach explains what's happening in your body, answers questions, and offers calm, evidence-informed guidance — never judgment.
Weekly and monthly patterns: average fast length, streaks, and the natural metabolic rhythm hiding in your own history.
Take Leptin with you. The iOS and Android apps keep your timer, your coach, and your line in your pocket.
Your body moves through distinct metabolic zones as the hours pass. Leptin names each one, explains it, and tells you what fits it.
Three steps between you and your first guided fast
Sign up free and tell us about your goals — we'll shape the plan around your life, not the other way round.
Begin the timer and we'll walk you through every phase — what's happening, how it may feel, and what to do next.
Use the Coach, watch your patterns, and settle into the eating-and-fasting rhythm that actually fits your life.
Leptin is built calm on purpose: no shame, no streaks-guilt, no hardcore diet culture. We explain what your body is doing and suggest what fits — evidence-informed, always respecting that you know your body best.
Your first fast can start tonight — we'll walk you through every hour of it.
Get Started FreeDownload Leptin for iPhone and Android