The cycle tracker built for two — she tracks, he stays in sync. Your data never leaves your own iCloud. No account, no ads, no trackers.
NerdCycle is the cycle tracker designed for two — track your period, fertility, and daily wellness, and share it with your partner. No accounts. No data collection. Everything stays on your iPhone and your private iCloud.
WHY NERDCYCLE
• Built for couples — share your cycle data with your partner so they can see what phase you're in and how to be supportive
• Privacy first — no analytics, no third-party tracking, no servers in the loop
• Beautiful pixel-perfect design with light and dark modes
• 7-day free trial. Yearly subscription or one-time lifetime purchase
CYCLE TRACKING
• Period predictions with confidence indicators
• Fertile window and ovulation forecasting
• Phase-aware insights for menstrual, follicular, ovulation, and luteal phases
• Cycle regularity score and prediction accuracy stats
• Daily tips tailored to your current phase
DAILY LOG
• Mood, flow, energy, sleep, symptoms
• Custom symptoms — add your own
• Water intake, exercise, basal body temperature (BBT)
• Cervical mucus (when you're trying to conceive)
• Quick notes for every day
PARTNER MODE
• Invite your partner with a private iCloud share — just send one link
• They see your phase, alert level, and partner-specific guidance
• Conversation tips, support kit, and "do today" suggestions tailored to her phase
• Stop sharing anytime in Settings
INSIGHTS & CHARTS
• Cycle length history and trend
• Mood and sleep correlations
• Top symptoms by phase
• Energy and sex drive patterns
• BBT chart with ovulation shift detection
• Monthly summary reports
APPLE INTEGRATIONS
• Apple Health: optional — writes period days and BBT, reads sleep, water, exercise and temperature
• Home screen widgets for quick cycle check
• Live Activity on Lock Screen and Dynamic Island
• Notifications for upcoming period, fertile window, and partner phase changes
EXPORT YOUR DATA
• CSV export for your records
• PDF doctor report for clinic visits
• Delete everything anytime in Settings
PRICING
NerdCycle is free to download with a 7-day free trial. After the trial, choose one of two options:
• Yearly Subscription — $9.99 per year, auto-renewable
• Lifetime — $29.99 one-time purchase
Subscriptions auto-renew unless cancelled at least 24 hours before the period ends. Manage or cancel in iOS Settings → Apple ID → Subscriptions.
Privacy Policy: https://vladoivankovic.com/NerdCycle/privacy.php
Terms of Use: https://vladoivankovic.com/NerdCycle/terms.php
NerdCycle is not a medical device. Predictions are estimates — always consult a healthcare professional for medical decisions.
Ratings & Reviews
This app hasn’t received enough ratings or reviews to display an overview.
• Your result first: setup now shows your cycle today, your next period and your fertile window before anything else. Don't know your last period date? Say so — and a pregnancy can start from the due date.
• In Settings → Data & Privacy, you can import past periods from a Flo data export. The file is read on your iPhone only.
• Everything in your language: symptoms, Insights, the doctor report, widgets, the Live Activity and the Apple Watch.
• "Sync now" in Apple Health settings now also brings in sleep, water and exercise added later.
• Exercise from Apple Health shows its exact minutes in your log.
• Text no longer gets cut off on smaller iPhones and Apple Watch sizes.
• Fixed: exporting the doctor report or your data opened an empty screen. The report is now easy to read in dark mode too, and CSV dates match the app.
• Clearer Insights charts, and a tab bar that fits every language.
• Fixed: partner mode could freeze on iPhone Pro Max models.
• Small fixes and improvements.
Version 1.7.1
The developer, VLADO IVANKOVIC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More