# Fertitest vs HeyStack

The clearest difference is update cadence: HeyStack at every 3 weeks against Fertitest's every 5 months. Fertitest's advantage is iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Fertitest ships an update every 5 months, HeyStack every 3 weeks. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Fertitest | HeyStack |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Size | 38 MB | 31 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [LEMKEN](https://appshunter.io/developer/966173259) | [Flowgistics](https://appshunter.io/developer/1754347759) |

## What reviewers say

### Fertitest

[App page](https://appshunter.io/ios/app/fertitest-lemken/id1530155441)

**Features:** macOS Compatibility

**In-app purchases:** none


### HeyStack

[App page](https://appshunter.io/ios/app/heystack/id6742833445)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fertitest free?

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

### Is HeyStack free?

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

### Do Fertitest or HeyStack have ads?

Neither Fertitest nor HeyStack shows ads.

### Which is updated more often, Fertitest or HeyStack?

Fertitest ships an update every 5 months, and HeyStack every 3 weeks. Most recently, Fertitest was updated on October 7, 2026 and HeyStack on October 2, 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.*