Easy to use
Great app and no data collection!
Response from developer
Thanks for your input. Hope you find it useful and fruitful.
Free
In-App Purchases
About
This app helps you identify your fertile window for conception through private data logging and transparent prediction engines. It visualizes your cycle data, including basal body temperature and cervical mucus, to show your most fertile days and predicted ovulation. Core features are free, with an optional subscription for advanced insights and history.
✓Log basal body temperature, cervical mucus, and test results
✓Visualize fertile window and predicted ovulation day
✓Transparent prediction engine with chart explanations
✓Private data storage with export and delete options
✓Optional subscription for full cycle history and insights
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What's New in Fertility Window Planner
1.0.1
August 30, 2026
• Your Pro subscription now stays put. A bug could switch Pro off for members who had already subscribed — that is fixed, and your subscription is restored automatically when the app opens. • Plan prices now show in your own local currency. • Saved cycle summaries open again — tap any summary in History to see the figures you captured. • Manage Subscription is now in Settings, and Restore Purchases is always available. • Fixed a rare start-up problem that could leave the app on a blank screen.
MoreSubscription plans
Fertility Planner Pro Monthly
Full history, cross-cycle insights & saved summaries.
$6.991 Month
7 Days trialUser reviews
Developer apps
FAQ
What is Fertility Window Planner?
Fertility Window Planner is a private health app designed to help users identify their fertile window for conception. It allows users to log various bodily signs and provides transparent predictions based on their data.
Does Fertility Window Planner have ads?
No, Fertility Window Planner is ad-free. The description explicitly states 'No ads, no data selling, no AI chatbot,' ensuring a private and uninterrupted user experience.
How accurate are Fertility Window Planner's predictions?
The app provides predictions with an 'honest confidence tier' for your fertile window, predicted ovulation day, and next period. It uses a transparent engine that shows its work, allowing users to understand how predictions are made.
What data can I log in Fertility Window Planner?
You can log basal body temperature (°F or °C), cervical mucus, ovulation-test results, flow, intercourse, and symptoms. Data entry is designed to be quick, with one tap per day, and is editable.
What are the benefits of the Pro subscription for Fertility Window Planner?
The optional Pro subscription unlocks full cycle history, cross-cycle chart overlay, personal pattern insights, and saved summaries. The core logging and current fertile window prediction remain free.
How much does Fertility Window Planner Pro cost?
Fertility Window Planner Pro offers monthly and annual subscription plans. The monthly option is $6.99, and the annual option is $39.99. Both plans include a 7-day free trial.
Can I cancel my Fertility Window Planner Pro subscription?
Yes, you can manage or cancel your subscription in your device's Settings. Auto-renewal must be canceled at least 24 hours before the current subscription period ends.
Is Fertility Window Planner available on all devices?
Based on the provided data, Fertility Window Planner is supported on iPhone and iPod. It is rated for ages 4 and up.