# Ovulation Calc & Fertile Days — Cycle & Fertility Calendar

> Cycle & Fertility Calendar (iPhone/iPad app by Blas Prieto.)

- Source: https://appshunter.io/ios/app/ovulation-calc-and-fertile-days/id6759358803 (this page in markdown: same URL + `.md`)
- Developer: [Blas Prieto](https://appshunter.io/developer/1878084920)
- Category: Lifestyle
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 25 MB
- Languages: American English
- Released: 2026-02-25
- Data updated: 2026-05-14
- User reviews in markdown: https://appshunter.io/ios/app/ovulation-calc-and-fertile-days/id6759358803/reviews.md

## What is Ovulation Calc & Fertile Days?

Find your most fertile days in seconds - just enter your last period date and cycle length.

Ovulation Calc uses proven cycle-based methods to predict your ovulation date, fertile window, and next period. Whether you're trying to conceive or simply want to understand your cycle better, get clear answers without handing over your personal health data.

KEY FEATURES:

* Fertile Window Prediction - See your 6-day fertile window and peak ovulation day based on your unique cycle length
* 3-Month Calendar View - Color-coded calendar shows period, fertile, and ovulation days at a glance
* Flexible Cycle Length - Adjustable slider supports cycles from 21 to 45 days
* Current Cycle Day - Always know where you are in your cycle today
* Next Period Date - Plan ahead with your predicted next period start date

DESIGNED WITH PRIVACY IN MIND:

No account required. No data leaves your phone. No cloud sync, no social features, no tracking. Just a simple, offline calculator that respects your privacy.

Free to download. Works offline. No sign-up required.

IMPORTANT: This app is not medical advice. It is for educational and informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Ovulation predictions are estimates based on average cycle data. Always consult a healthcare provider for fertility and reproductive health decisions.

By Blas Apps - simple calculators that do one thing perfectly.


## Version history (last 5 releases)

### 1.0.7 — 2026-03-15

Improved App Store listing.

### 1.0.6 — 2026-03-05

Fixed interstitial ad loading. Improved stability and performance.

### 1.0.5 — 2026-03-04

Fixed a crash that could occur on app launch. Improved stability and performance.

### 1.0.4 — 2026-03-03

Fixed a crash that could occur on app launch. Improved stability.

### 1.0.3 — 2026-03-03

Bug fixes and performance improvements.

## More apps by Blas Prieto

- [Compound Calc: Savings](https://appshunter.io/ios/app/compound-calc-savings/id6759321374)
- [Auto Loan Calc: Car Payment](https://appshunter.io/ios/app/auto-loan-calc-car-payment/id6759358751)
- [Mulch Calculator & Estimator](https://appshunter.io/ios/app/mulch-calculator-and-estimator/id6759358826)
- [BTU Calculator: AC & HVAC](https://appshunter.io/ios/app/btu-calculator-ac-and-hvac/id6759358896)
- [Freelance Rate Calculator](https://appshunter.io/ios/app/freelance-rate-calculator/id6759358903)

All apps by Blas Prieto: https://appshunter.io/developer/1878084920

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-14.*