# Ovulation Date Calculator vs MoonFlow

The clearest difference is in-app purchases: Ovulation Date Calculator at none against MoonFlow's 3. Ovulation Date Calculator also leads on update cadence (every 3 days vs fortnightly). MoonFlow's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. MoonFlow sells 3 in-app purchases, starting at $3.99 per month. Ovulation Date Calculator asks for nothing beyond the download.

Ovulation Date Calculator ships an update every 3 days, MoonFlow fortnightly. Both last shipped on October 30, 2026.

## The numbers

| Metric | Ovulation Date Calculator | MoonFlow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/moonflow-period-tracker-cycle/id6756520833/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Fortnightly |
| Monetization | — | Freemium |
| Size | 30 MB | 176 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Abdelkarem Bahy Abdelkarem](https://appshunter.io/developer/1848738097) | [Tarik Murat Islam](https://appshunter.io/developer/1861137277) |

## What reviewers say

### Ovulation Date Calculator

[App page](https://appshunter.io/ios/app/ovulation-date-calculator/id6754885156)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### MoonFlow

[App page](https://appshunter.io/ios/app/moonflow-period-tracker-cycle/id6756520833)

This app helps you track your menstrual cycle, ovulation, and pregnancy with a focus on privacy. It offers accurate predictions, daily logging of symptoms, and a pregnancy mode. All your data is stored locally on your device, ensuring it's never shared or sold.

**Highlights:** Accurate period and ovulation predictions, Daily symptom and mood logging, Pregnancy mode with week-by-week development, 100% offline data storage, App lock with PIN or biometrics, Stealth mode for calculator disguise, Data export to file

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $3.99 | per month |
| Annual Premium | $29.99 | per year |
| Lifetime Access | $79.99 | one-time |


## Frequently asked questions

### Is Ovulation Date Calculator free?

Ovulation Date Calculator is free to download, with no in-app purchases.

### Is MoonFlow free?

MoonFlow is free to download, with in-app purchases available.

### Do Ovulation Date Calculator or MoonFlow have ads?

Ovulation Date Calculator shows ads; MoonFlow does not.

### Which is updated more often, Ovulation Date Calculator or MoonFlow?

Ovulation Date Calculator ships an update every 3 days, and MoonFlow fortnightly. Most recently, Ovulation Date Calculator was updated on October 30, 2026 and MoonFlow on October 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*