Train in sync with
your cycle & body

Yes, your data is encrypted, only you can see it, and we never sell it or use it for ads. You can delete any entry or your whole account anytime, and our privacy policy has the full details.

Yes. Phasly is a cycle-aware period tracker, and a fitness app. Most period-tracker apps only log your dates. Phasly turns your cycle into cycle-sync workouts that adapt to your phase and how you feel each day. So you get both, period tracking and personalised, phase-based training, in one app.

Not at all. Phasly runs ten cycle modes. Natural cycle, the pill / patch / ring, hormonal IUD (with or without periods), implant / injection, copper IUD, PMOS (PCOS), perimenopause (with or without a cycle), menopause, pregnancy and postpartum. So it works whether your cycle is regular, irregular, paused or changing.

Yes. Tell Phasly your method once and it follows the pattern you actually have. On the pill, patch or ring it plans around your pack week, including the break week. The withdrawal bleed is not treated as a period. With a hormonal IUD it follows your cycle if you still get periods, and your check-ins if you don't. With a copper IUD it follows your natural cycle with heavier periods in mind. On the implant or the shot it follows your adaptation stage, and on the shot your dose dates. Your daily check-in, your logged weights and your PRs shape every workout on top of that. More in our guide to cycle syncing on birth control. Phasly doesn't give advice on choosing or taking contraception.

Yes, if you want to. Weight tracking is optional and off until you turn it on in Profile. Weight, waist, hips and body fat each have their own switch. You log them with your 30-second check-in, in lb or kg and inches or cm, following your phone settings. Phasly keeps every day in your history, shows your 7-day average, your weekly and monthly change and your progress toward a goal if you set one, and puts each reading next to your cycle day. So a heavier morning before your period reads as water, not lost progress. Phoebe uses it for your training only when it matters for your goal, and she never sets calorie targets or diets.

We're careful here, because the science deserves honesty. There's a growing body of peer-reviewed research on how ovarian hormones (estrogen and progesterone) influence strength, recovery, energy, sleep and injury risk across the menstrual cycle. But the findings vary between individuals, and no one should overpromise a one-size-fits-all "cycle protocol." The largest review on cycle phase and performance says as much: its authors concluded that general guidelines cannot be formed, and recommended a personalised approach instead. So Phasly treats the research as a starting framework, not a rulebook, and personalises it to you.

No, and that's the whole point. Research is clear that your cycle phase is only one input: sleep, stress, training load and how you genuinely feel day to day all shape your energy and recovery just as much. So alongside your phase, Phasly tracks a quick daily check-in, energy, sleep, readiness, mood and symptoms, and adapts your plan to what your body is telling you right now, not just where you are in the month. The more you log, the more it learns your real, personal pattern. Two women on the same cycle day can get different plans, because they feel different.

Phasly starts with a 30-day free trial of Phasly Plus on the annual plan ($89.99/year), or $14.99/mo with no trial. Plus unlocks personalised workouts, the AI Coach, the hormone diagram, the private intimate calendar and pregnancy planning. Your cycle tracker stays free, even if you cancel. That covers the calendar, phases, daily check-in and cycle PDF reports, in all 10 cycle modes. The first 500 founding members get 10% off the annual plan, locked in for as long as you stay subscribed. Cancel anytime.

Yes. Cycle-synced workouts work in all 10 modes, not only a natural cycle. In menopause, training focuses on strength and bone. In pregnancy you get week-by-week guidance with conservative, pregnancy-safe training. Postpartum starts with recovery weeks and the pelvic floor, then a graded return, with breastfeeding-aware notes.

November 2026, on iOS and Android. Join the early access waitlist at phasly.app. Everyone on the list gets in first, before public launch, and the first 500 to join also get the founding-member discount.