# Direct_Square_Variation vs Protein Viewer Pro

The clearest difference is iOS requirement: Direct_Square_Variation at 12.0 against Protein Viewer Pro's 15.6. 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.

## The numbers

| Metric | Direct_Square_Variation | Protein Viewer Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 2 weeks |
| Size | 25 MB | 27 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Science Education Institute](https://appshunter.io/developer/1439710468) | [Heebok Lee](https://appshunter.io/developer/1855773499) |

## What reviewers say

### Direct_Square_Variation

[App page](https://appshunter.io/ios/app/direct-square-variation/id6742364810)

**Features:** macOS Compatibility

**In-app purchases:** none


### Protein Viewer Pro

[App page](https://appshunter.io/ios/app/protein-viewer-pro/id6755710571)

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

**In-app purchases:** none


## Frequently asked questions

### Is Direct_Square_Variation free?

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

### Is Protein Viewer Pro free?

Protein Viewer Pro is free to download, with no in-app purchases.

### Do Direct_Square_Variation or Protein Viewer Pro have ads?

Neither Direct_Square_Variation nor Protein Viewer Pro 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.*