iPhone · Health & Fitness
What are your actual chances?
Most fertility apps track your cycle. Fertility Forecaster answers the question underneath it — your real per-cycle probability of conceiving, a way to feel what that probability means, and an honest projection of the months ahead.
No account. No subscription. No network calls of any kind.
Example estimate
What it does
Three things, done properly
No streaks, no daily logging, no notifications asking how you feel today.
An honest monthly number
Starting from your age and sharpened by anything else you choose to share — how long you've been trying, your cycles, your health, your partner. Every question is optional.
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.
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.
Why it's different
It won't flatter you, and it won't frighten you
Fertility is a field thick with folklore. The app's job is to say what the research actually supports, including when that's unwelcome and when it's reassuring.
- The estimate falls the longer you've been trying — and the app explains why that's ordinary statistics, not a diagnosis.
- Low AMH barely moves your number, because it turns out to be a poor predictor of natural conception.
- Timing with ovulation tests counts in your favour, instead of being penalised as low monthly frequency.
- A clear workup is treated as real information, not a blank answer.
- Every factor is shown with its effect size, so you can see what's driving the result.
Shows its working
Age sets a baseline from published cohort fecundability data.
Your answers adjust it by their reported fecundability ratios.
Cycles already spent trying update the estimate as evidence.
Projections age you as they run, cycle by cycle.
The in-app How this works sheet names the sources and states plainly what the model cannot see.
Privacy
The strongest privacy promise is having no server
Reproductive health data is about as sensitive as personal information gets. So the app doesn't transmit any.
No account, ever
Nothing to sign up for, no email required, no profile held anywhere. Open the app and use it.
No network calls
The app makes no requests at all. Your answers cannot be intercepted in transit because they are never in transit.
No analytics or tracking
No advertising, attribution, crash reporting, or third-party SDK of any kind. The App Store label reads Data Not Collected.
Delete means delete
Reset clears your answers. Deleting the app removes its storage. We hold no copy, because we never had one.
It produces population-level statistical estimates from published research. It is not a diagnosis, not a medical device, and not a prediction about you specifically. It cannot see anything a clinician would find. Please talk to a doctor about your own situation — especially if you have been trying for a year, or six months if you are over 35.