# Fast vs Inverse Variation

The clearest difference is in-app purchases: Inverse Variation at none against Fast's 3. Inverse Variation also leads on ads (none vs shown) and iOS requirement (12.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. Fast sells 3 in-app purchases, starting at $4.99 per 7 days. Inverse Variation asks for nothing beyond the download.

## The numbers

| Metric | Fast | Inverse Variation |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | — |
| Size | 25 MB | 30 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Atech Consultancy Ltd](https://appshunter.io/developer/1818884485) | [Science Education Institute](https://appshunter.io/developer/1439710468) |

## What reviewers say

### Fast

[App page](https://appshunter.io/ios/app/fast-speak-moldovan-language/id6737729573)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Access | $4.99 | per 7 days |
| Yearly Access | $29.99 | per year |
| Lifetime Access | $39.99 | one-time |


### Inverse Variation

[App page](https://appshunter.io/ios/app/inverse-variation/id6742364340)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Fast free?

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

### Is Inverse Variation free?

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

### Do Fast or Inverse Variation have ads?

Fast shows ads; Inverse Variation 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.*