Simple Cycle. vs Luna

A period tracker built for women who refuse to send their cycle to the cloud. Local-only. No account. No subscription. Nothing leaves your phone. Ever. Open the app, log your day, close it. Open it again when you need to. The cycle stays here, predictions get smarter as you log, and nobody — not us, not Apple, not your phone carrier, not advertisers — sees a single byte of it. What you get: • Cycle calendar with period dots and a passive fertile-window indicator • Predictions that learn from your own logs — more cycles, sharper predictions • Quick logging — flow, cramps, mood, optional notes • Face ID / Touch ID app lock • One period reminder, one day before — or off • Full CSV export, anytime, no questions What you don't get: • No accounts. No login. Ever. • No iCloud sync. No Apple Health sync. No cross-device anything. • No ads. No analytics. No trackers. • No subscription. No upsells. No "premium tier." • No streaks, badges, or daily check-in nagging. • No symptom mining. No AI "cycle coach." The deal: Free for 7 days. Then $1.99, once — yours forever. No subscription. No price hike. The lowest one-time price on the App Store for a serious period tracker, and the only one that physically cannot leak your data because it's never connected to anything. The fertile-window indicator is estimated from cycle averages and is not a contraceptive — not for family planning. Built by Under5 — apps that respect your time, your privacy, and your wallet.

Luna is the period and fertility tracker that keeps your most personal health data exactly where it belongs — on your device. No accounts. No cloud sync. No data sharing. Just intelligent, private cycle tracking powered entirely by on-device machine learning. YOUR DATA NEVER LEAVES YOUR PHONE Luna was built from the ground up with privacy as the foundation. Every prediction, every insight, every log entry is processed and stored locally. We can't see your data because it never reaches us — not even anonymized. SMART PREDICTIONS, PRIVATELY POWERED Luna's on-device ML model learns your unique cycle patterns over time, delivering increasingly accurate predictions for: Period start and end dates Fertile windows and ovulation estimates PMS and symptom pattern recognition Cycle length trends and irregularities TRACK WHAT MATTERS TO YOU Daily symptom and mood logging Flow intensity and duration Basal body temperature (BBT) Cervical mucus and ovulation signs Intimacy and contraception notes DESIGNED FOR EVERY BODY Luna adapts to irregular cycles, post-hormonal transitions, perimenopause, and more. There's no "normal" cycle — Luna learns yours. BUILT FOR TRUST At a time when reproductive health data has never been more sensitive, Luna takes a firm stance: what happens on your phone stays on your phone. No account required to get started. No subscription needed to unlock your own data.