Lua Cycle
Your cycle, understood
Lua Cycle is a beautifully designed period and ovulation tracker for iPhone — private, accurate, and built for how your body actually works.
Smart predictions
Predict your next period, ovulation, and fertile window using your real cycle data — not averages.
Symptom logging
Track cramps, mood, sleep, libido, flow, and more. Spot patterns you'd never notice on your own.
Private by design
Your data stays on your device. No accounts required. No selling of health data to advertisers.
Cycle syncing
Plan workouts, work, social life and nutrition with insights tailored to each phase of your cycle.
Beautifully calm
An interface designed to feel like a journal, not a medical chart. Soft, minimal, and never anxious.
Made for iOS
Native iPhone app with Health app sync, widgets, Lock Screen indicators, and Apple Watch support.
Built by people who use it
Lua Cycle started because the existing period trackers either felt like data brokers or like medical devices. We wanted something quieter — an app that respects your privacy and shows you the patterns that matter, in language that doesn't pretend.
Every prediction is based on your own cycle data. Nothing is shared without consent. You can export everything, delete everything, or just close the app and we'll forget the whole thing.
From the journal
Cycle syncing for energy & focus
How to align workouts, sleep, and work with each phase of your cycle.
First period guide
What to expect, what's normal, and what to track from day one.
How long do periods last?
Average duration, normal ranges, and when to talk to a doctor.
Period cramps: what actually helps
Evidence-based relief — heat, magnesium, movement, and beyond.
When am I most fertile?
Understanding ovulation, the fertile window, and signs of fertility.
Why is my period late?
Common causes from stress to PCOS, and when it warrants a doctor visit.
PCOS & irregular periods
What polycystic ovary syndrome means and how tracking helps.
PMDD vs PMS
Understanding the difference and what treatment options exist.
Insomnia before your period
Why sleep gets harder in the luteal phase — and what to try.
Workouts for each cycle phase
Match training intensity to your hormonal landscape.