# Happy Stack Equilibrium vs Mathris

The clearest difference is in-app purchases: Happy Stack Equilibrium at none against Mathris's 3. Happy Stack Equilibrium also leads on ads (none vs shown) and iOS requirement (10.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. Mathris sells 3 one-off in-app purchases. Happy Stack Equilibrium asks for nothing beyond the download.

## The numbers

| Metric | Happy Stack Equilibrium | Mathris |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Every 3 days |
| Size | 91 MB | 177 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Francesc Navarro Machio](https://appshunter.io/developer/488794379) | [Sadik Zabun](https://appshunter.io/developer/1896603144) |

## What reviewers say

### Happy Stack Equilibrium

[App page](https://appshunter.io/ios/app/happy-stack-equilibrium/id1519015365)

**Features:** macOS Compatibility

**In-app purchases:** none


### Mathris

[App page](https://appshunter.io/ios/app/mathris-math-puzzle-game/id6778136048)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hearts | $0.99 | one-time |
| Smart pack | $0.99 | one-time |
| Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is Happy Stack Equilibrium free?

Happy Stack Equilibrium is free to download, with no in-app purchases.

### Is Mathris free?

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

### Do Happy Stack Equilibrium or Mathris have ads?

Mathris shows ads; Happy Stack Equilibrium does not.

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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.*