# Ovulation Estimator vs ZoeFlow

The clearest difference is in-app purchases: Ovulation Estimator at none against ZoeFlow's 2. ZoeFlow's advantage is update cadence (every 8 days vs every 6 months) and iOS requirement (15.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. ZoeFlow sells 2 in-app purchases, starting at $1.99 per month. Ovulation Estimator asks for nothing beyond the download.

Ovulation Estimator ships an update every 6 months, ZoeFlow every 8 days. The most recent releases landed on October 16, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Ovulation Estimator | ZoeFlow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ovulation-estimator/id529437218/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 8 days** |
| Monetization | Free | — |
| Size | 6 MB | 124 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Malay Patel](https://appshunter.io/developer/510333524) | [BLOOM IT TECH](https://appshunter.io/developer/1887770888) |

## What reviewers say

### Ovulation Estimator

[App page](https://appshunter.io/ios/app/ovulation-estimator/id529437218)

This health tool helps you estimate your ovulation date. Simply enter your last menstrual period and cycle length to predict your most fertile days. It's designed for women tracking their reproductive health.

**Highlights:** Ovulation date calculation, Last menstrual period input, Period cycle length input, Fertile window prediction, Health and fitness tracking

**Features:** macOS Compatibility

**In-app purchases:** none


### ZoeFlow

[App page](https://appshunter.io/ios/app/zoeflow-period-tracker/id6761095101)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Yearly | $12.99 | per year |


## Frequently asked questions

### Is Ovulation Estimator free?

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

### Is ZoeFlow free?

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

### Do Ovulation Estimator or ZoeFlow have ads?

Neither Ovulation Estimator nor ZoeFlow shows ads.

### Which is updated more often, Ovulation Estimator or ZoeFlow?

Ovulation Estimator ships an update every 6 months, and ZoeFlow every 8 days. Most recently, Ovulation Estimator was updated on October 16, 2026 and ZoeFlow on October 25, 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.*