# OneOpen vs DBF Viewer

The clearest difference is in-app purchases: OneOpen at none against DBF Viewer's 2. DBF Viewer's advantage is device support (4 vs 2) and iOS requirement (15.0 vs 17.0). On price, update cadence and ads there is nothing between them.

Both are free to download. DBF Viewer sells 2 in-app purchases, starting at $6.99 per 7 days. OneOpen asks for nothing beyond the download.

OneOpen ships an update every 9 days, DBF Viewer every 6 days. The most recent releases landed on October 13, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | OneOpen | DBF Viewer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 6 days** |
| Size | 21 MB | 23 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Freedom Dimension (shenzhen) Technology Co., Ltd](https://appshunter.io/developer/6776064465) | [Rush Tools LLC](https://appshunter.io/developer/1896773547) |

## What reviewers say

### OneOpen

[App page](https://appshunter.io/ios/app/oneopen-file-viewer/id6792251542)

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

**In-app purchases:** none


### DBF Viewer

[App page](https://appshunter.io/ios/app/dbf-viewer/id6800510170)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Access | $6.99 | per 7 days |
| Annual Access | $69.99 | per year |


## Frequently asked questions

### Is OneOpen free?

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

### Is DBF Viewer free?

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

### Do OneOpen or DBF Viewer have ads?

Neither OneOpen nor DBF Viewer shows ads.

### Which is updated more often, OneOpen or DBF Viewer?

OneOpen ships an update every 9 days, and DBF Viewer every 6 days. Most recently, OneOpen was updated on October 13, 2026 and DBF Viewer on October 20, 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.*