# MSI vs OpenAPI Viewer

The clearest difference is in-app purchases: MSI at none against OpenAPI Viewer's 3. MSI also leads on iOS requirement (13.5 vs 18.1). On price, ads and device support there is nothing between them.

Both are free to download. OpenAPI Viewer sells 3 one-off in-app purchases. MSI asks for nothing beyond the download.

## The numbers

| Metric | MSI | OpenAPI Viewer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 2 weeks |
| Size | 30 MB | 13 MB |
| Requires iOS | **13.5** | 18.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Mastersystem](https://appshunter.io/developer/1592236080) | [Victor Manuel Puga Ruiz](https://appshunter.io/developer/1648773908) |

## What reviewers say

### MSI

[App page](https://appshunter.io/ios/app/msi-msvision/id6474287187)

**In-app purchases:** none


### OpenAPI Viewer

[App page](https://appshunter.io/ios/app/openapi-viewer/id6761346493)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $1.99 | one-time |
| Medium Tip | $4.99 | one-time |
| Large Tip | $9.99 | one-time |


## Frequently asked questions

### Is MSI free?

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

### Is OpenAPI Viewer free?

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

### Do MSI or OpenAPI Viewer have ads?

Neither MSI nor OpenAPI Viewer 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.*