# Subtractor vs MathStar Practice

The clearest difference is in-app purchases: Subtractor at none against MathStar Practice's 2. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. MathStar Practice sells 2 in-app purchases, starting at $2.99 per month. Subtractor asks for nothing beyond the download.

## The numbers

| Metric | Subtractor | MathStar Practice |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 days | — |
| Size | 0 MB | 3 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [David Kelen](https://appshunter.io/developer/1796712157) | [Dmytro Sydorov](https://appshunter.io/developer/1895702272) |

## What reviewers say

### Subtractor

[App page](https://appshunter.io/ios/app/subtractor-by-mather/id6742201502)

**Features:** macOS Compatibility

**In-app purchases:** none


### MathStar Practice

[App page](https://appshunter.io/ios/app/mathstar-practice/id6764249586)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MathStar Premium | $2.99 | per month |
| MathStar Premium Annual | $19.99 | per year |


## Frequently asked questions

### Is Subtractor free?

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

### Is MathStar Practice free?

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

### Do Subtractor or MathStar Practice have ads?

Neither Subtractor nor MathStar Practice shows ads.

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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.*