Eva Cycle : Period Tracker

Eva Cycle is the privacy-first menstrual cycle tracker that keeps everything on your device — forever. No accounts. No cloud. No data collection. Your most personal health data stays exactly where it belongs: with you. SMART PREDICTIONS Eva Cycle uses a Bayesian statistical algorithm that learns from your own cycle history to predict: • Your next period start date (with confidence intervals) • Your estimated ovulation window • Daily conception probability The more you log, the smarter and more personalised your predictions become. DAILY LOGGING Track everything that matters to you: • Menstrual flow intensity (light, medium, heavy) • Mood (happy, calm, energetic, sad, irritable, anxious, tired) • Cervical mucus observations • Basal body temperature (BBT) • Pain levels • Intercourse & protection status • Free-form notes COMPLETE PRIVACY & SECURITY Eva Cycle was built from the ground up with privacy as the core feature — not an afterthought: • 100% offline — zero internet or server communication, ever • AES-256 encryption (SQLCipher) protects all your data on device • Biometric lock (Face ID / fingerprint) secures app access • One-tap emergency data wipe removes everything instantly • Encrypted backups with your own passphrase — we never see your key • No analytics, no tracking, no ads CALENDAR & HISTORY • Monthly and weekly calendar views • Full cycle history with statistics • See patterns and trends over time BACKED UP ON YOUR TERMS Export an encrypted backup file to your own storage at any time. Restore it on the same device or a new one using only your passphrase — no account required. ONE-TIME PURCHASE Eva Cycle is free to try for 60 days. After that, a single one-time purchase unlocks Eva Cycle Premium permanently — no recurring subscription, ever.