Most fasting apps were built for men. Circafast adapts to your cycle, your insulin sensitivity, and how you actually feel — no logging required.
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If you have PCOS, you've probably been told that intermittent fasting is great for insulin resistance — and it can be. But you've also probably tried 16:8 every single day and felt worse: more anxious, more inflamed, more irregular. That's not you failing at fasting. That's fasting failing you.
PCOS sits at the intersection of three issues that generic fasting apps completely ignore. First, insulin resistance — your cells need more insulin to take up glucose, so erratic eating windows that spike and crash blood sugar make things worse, not better. Second, cortisol dysregulation — fasting is a stressor. Done too aggressively (daily 18:6+, skipping the luteal phase entirely), it raises cortisol, which directly antagonizes progesterone and worsens androgen levels. Third, cycle irregularity — the whole point of cycle-synced fasting is adapting your window to your phase. But if your app assumes a textbook 28-day cycle and doesn't let you update it, it's giving you advice for a body you don't have.
The research on IF for PCOS is early but directional: shorter, consistent windows in the 14:10–16:8 range tend to help; aggressive or erratic protocols tend to hurt. The detail matters. Our guide on when NOT to fast →
Never pushes you past 16:8 during luteal — even if you feel fine. Luteal cortisol sensitivity is real, and the app knows it. Menstrual phase defaults to 14:10 max. You can always go shorter; the AI won't push you longer.
Your body, your call. If the AI suggests something that doesn't feel right, tap "Skip AI Today" and set your own window. Full manual mode available in settings — disable AI coaching entirely and just use the schedule tracker.
Rate energy, mood, and difficulty in 30 seconds. No calorie counting, no food journals, no macros. The AI adapts tomorrow's window from those three signals — nothing else required.
| Feature | Circafast | Zero | Fastic |
|---|---|---|---|
| Cycle-aware protocol | ✓ Yes | ✗ No | ✗ No |
| Zero food logging | ✓ Never required | ✗ Premium feature | ✗ Core feature |
| Manual override / AI off | ✓ Full manual mode | ✗ No | ✗ No |
| PCOS-aware phase caps | ✓ Built in | ✗ No | ✗ No |
"I built Circafast because I watched people with PCOS get handed a one-size-fits-all fasting protocol that ignored everything specific about their situation. The app that didn't exist was one that actually adapted — to your phase, your energy, your body's signals that day. So I built it."
100 founding spots. Live counter. When they're gone, the deal closes permanently.
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