# OpenAPI Viewer vs BDUI Go

The clearest difference is in-app purchases: BDUI Go at none against OpenAPI Viewer's 3. BDUI Go also leads on iOS requirement (15.0 vs 18.1). On price, update cadence, ads and device support there is nothing between them.

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

OpenAPI Viewer ships an update every 3 weeks, BDUI Go every 2 weeks. The most recent releases landed on November 5, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | OpenAPI Viewer | BDUI Go |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Size | 15 MB | 62 MB |
| Requires iOS | 18.1 | **15.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Victor Manuel Puga Ruiz](https://appshunter.io/developer/1648773908) | [Yuriy Zhelannov](https://appshunter.io/developer/6796796590) |

## 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 |


### BDUI Go

[App page](https://appshunter.io/ios/app/bdui-go/id6796796588)

**In-app purchases:** none


## Frequently asked questions

### Is OpenAPI Viewer free?

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

### Is BDUI Go free?

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

### Do OpenAPI Viewer or BDUI Go have ads?

Neither OpenAPI Viewer nor BDUI Go shows ads.

### Which is updated more often, OpenAPI Viewer or BDUI Go?

OpenAPI Viewer ships an update every 3 weeks, and BDUI Go every 2 weeks. Most recently, OpenAPI Viewer was updated on November 5, 2026 and BDUI Go on November 1, 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.*