Fertility Forecaster
Chance of conceiving, by age
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Your real chances of conceiving this cycle, and across the next twelve. Built from published research, honest about uncertainty, private by design. No cycle tracking.
Most fertility apps track your cycle. This one answers a different question: what are your actual chances?
Fertility Forecaster gives you a per-cycle probability of conceiving, a way to feel what that probability means, and an honest projection of how the next year or two might go.
WHAT YOU GET
A monthly number. Starting from your age, refined by anything else you choose to share — how long you've been trying, how regular your cycles are, your health, your partner. Every question is optional, and skipping one isn't a penalty.
A way to feel it. A percentage is easy to misread. Spin a wheel weighted to your exact odds. Count out a hundred people like you. Or play a year forward, cycle by cycle, and watch how differently it can go.
The longer view. Cumulative chances across the next 3, 6, 12 or 24 cycles, with the curve that shows how it flattens — and why that flattening isn't a verdict.
HOW IT'S DIFFERENT
It shows its working. A prominent "Method & medical sources" section explains the calculation and links to eight original studies and clinical guidelines.
It won't flatter you. The estimate falls the longer you've been trying, because that is what the evidence says. The app explains why that's ordinary Bayesian updating rather than bad news, and why plenty of couples in the slow tail still conceive.
It tells you where the research disagrees with the folklore. Low AMH, for instance, turns out to be a poor predictor of natural conception, and the app says so plainly instead of alarming you.
Timing is handled properly. If you use ovulation tests and concentrate sex into the fertile window, that counts in your favour — not against you for a low monthly average.
NO CYCLE TRACKING
Deliberately. There are excellent apps for logging periods and this isn't one of them. Nothing to log daily, no notifications, no streaks to keep.
PRIVATE BY DESIGN
No account, no sign-in, no network calls. Your answers live in this app's own storage and disappear when you delete it.
Fertility Forecaster gives population estimates, not a diagnosis or a prediction about you specifically. It cannot see anything a doctor would find. If you have been trying for a while, talk to one.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Dayton Thorpe, 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.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Dayton Thorpe
- Size
- 1.2 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Contains
Health or Wellness Topics
- Copyright
- © 2026 Dayton Thorpe