# OpenAPI Viewer vs Vato IDE

The clearest difference is in-app purchases: Vato IDE at none against OpenAPI Viewer's 3. Vato IDE also leads on iOS requirement (16.4 vs 18.1). OpenAPI Viewer's advantage is update cadence (every 2 weeks vs every 2 months). 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. Vato IDE asks for nothing beyond the download.

OpenAPI Viewer ships an update every 2 weeks, Vato IDE every 2 months. The most recent releases landed on September 18, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | OpenAPI Viewer | Vato IDE |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Size | 13 MB | 39 MB |
| Requires iOS | 18.1 | **16.4** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Victor Manuel Puga Ruiz](https://appshunter.io/developer/1648773908) | [Noah d'hondt](https://appshunter.io/developer/1895874866) |

## What reviewers say

### 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 |


### Vato IDE

[App page](https://appshunter.io/ios/app/vato-ide/id6764676692)

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

**In-app purchases:** none


## Frequently asked questions

### Is OpenAPI Viewer free?

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

### Is Vato IDE free?

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

### Do OpenAPI Viewer or Vato IDE have ads?

Neither OpenAPI Viewer nor Vato IDE shows ads.

### Which is updated more often, OpenAPI Viewer or Vato IDE?

OpenAPI Viewer ships an update every 2 weeks, and Vato IDE every 2 months. Most recently, OpenAPI Viewer was updated on September 18, 2026 and Vato IDE on September 16, 2026.

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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.*