Most fasting and fitness research was done on men. Phasely gives you guidance that finally matches how your body actually works — across every phase of your cycle.
Fasting apps tell you to do 16:8 every single day. Fitness apps hand you the same workouts all month long. Neither one knows what phase you're in — or that it changes everything about how you should eat, move, and rest.
Phasely was built by a designer who got tired of optimising her body around advice designed for a different one. It's grounded in the work of researchers who study women specifically.
"Work with your cycle, not against it."
Each phase has its own hormonal signature — and its own optimal way to fast, train, and eat. Tap through to see how the guidance changes.
Estrogen peaks at ovulation and a brief testosterone rise joins it. Energy and strength are at their highest — your strongest window of the whole month.
Not just a countdown. Phasely suggests the optimal fasting window for today's phase — and shifts it as your cycle moves. Longer in Peak, gentler in Reset. You start when it makes sense for your body, not when an algorithm says everyone should.
Ask anything about fasting, hormones, or movement. Every answer is grounded in 172 curated knowledge units drawn from six expert researchers — and every claim shows its source. When the experts disagree, the Coach tells you that too.
Your entire cycle at a glance, colour-coded by phase. Log periods, track predictions, and finally understand why some weeks feel effortless and others feel like swimming upstream — because they're genuinely different.
The Coach draws on six expert camps and peer-reviewed studies — and surfaces the genuine disagreements between them instead of pretending the science is settled.
Phasely shares educational guidance, not medical advice. The Coach routes anything safety-sensitive toward a qualified professional — by design.
The full app is free at launch. The AI Coach subscription tiers are coming soon — try all the core features now at no cost.
Free to download. Phase-aware fasting and fitness guidance from day one.