CycleOne is a privacy-first menstrual cycle tracker built for users who value data sovereignty above all else. In an era of subscription fatigue and growing privacy concerns, CycleOne takes a stand: your health data is yours alone. WHY CYCLEONE? No Subscription. Ever. Pay once, use forever. Unlike competitors charging $40-$100 per year, CycleOne costs $2.99 one time. No recurring fees, no premium tiers, no locked features. Total Privacy. Zero Compromise. Your data never leaves your device. CycleOne has no network entitlements, no cloud sync, no accounts, and no third-party analytics. Not even we can access your data because it never leaves your phone. Open Source Transparency. CycleOne is GPL-3.0 licensed. Every line of code is publicly auditable. No hidden data collection, no secret trackers. CORE FEATURES Advanced Cycle Prediction - Intelligent period start date and duration predictions - Automatic ovulation and fertile window calculation - Irregularity alerts for cycle variance awareness Comprehensive Logging - Flow intensity tracking (spotting to heavy) - Symptom database: physical, emotional, digestive - Mood and energy level tracking - Personal notes with each entry Beautiful Native Experience - Native iOS calendar with UICalendarView - 5 custom accent color themes - Smooth animations and premium UI - Dark mode support - No emojis, professional aesthetic Data Export - Export your complete history to CSV - Plain text format, no proprietary lock-in - Share with healthcare providers easily Local Notifications - Period reminders (1-5 days before) - Fertile window alerts - All notifications scheduled locally on device WHO IS CYCLEONE FOR? CycleOne is designed for anyone who: - Wants to own their health data - Refuses to pay monthly for basic tracking - Values privacy after Roe v. Wade - Prefers simple, focused tools - Needs reliable cycle predictions without cloud risks PRIVACY COMMITMENT CycleOne was built from the ground up to be safe: - No Cloud Sync: Your data never leaves your device - No Accounts: No email, no password, no login required - No Analytics: Zero third-party tracking or telemetry - No Network Entitlements: The app does not request internet access - Data Sovereignty: Export your entire history anytime LANGUAGES English, Filipino, Japanese, Simplified Chinese, Traditional Chinese, Korean TECHNICAL DETAILS - Built with Swift 5.9 and SwiftUI - Core Data for local persistence - Native iOS 16+ design - No third-party dependencies - 100% test coverage CycleOne is not a medical device and does not provide medical advice. Predictions are estimates based on your logged data. Your cycle. Your data. Your privacy.
