# Omni Viewer App vs OnePreview

The clearest difference is in-app purchases: OnePreview at none against Omni Viewer App's 1. Omni Viewer App's advantage is iOS requirement (15.5 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Omni Viewer App sells 1 one-off in-app purchase. OnePreview asks for nothing beyond the download.

Omni Viewer App ships an update every 6 days, OnePreview weekly. Both last shipped on November 9, 2026.

## The numbers

| Metric | Omni Viewer App | OnePreview |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/onepreview-file-viewer/id6760284919/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 days** | Weekly |
| Monetization | — | Free |
| Size | 96 MB | 9 MB |
| Requires iOS | **15.5** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [kwoun ukjin](https://appshunter.io/developer/1637005386) | [培克 罗](https://appshunter.io/developer/1516557687) |

## What reviewers say

### Omni Viewer App

[App page](https://appshunter.io/ios/app/omni-viewer-app/id6759875642)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee Tip | $0.99 | one-time |


### OnePreview

[App page](https://appshunter.io/ios/app/onepreview-file-viewer/id6760284919)

View and export various file types like Markdown, code, and archives locally on your device. Create PDF reports from Markdown files with advanced rendering options. Inspect data and code without direct editing.

**Highlights:** Preview Markdown with code highlighting, Render Mermaid diagrams and KaTeX formulas, Export Markdown to A4 PDF reports, Inspect SQLite databases and ZIP archives, Supports over 20 file formats, Local-first, no account required

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases:** none


## Frequently asked questions

### Is Omni Viewer App free?

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

### Is OnePreview free?

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

### Do Omni Viewer App or OnePreview have ads?

Neither Omni Viewer App nor OnePreview shows ads.

### Which is updated more often, Omni Viewer App or OnePreview?

Omni Viewer App ships an update every 6 days, and OnePreview weekly. Most recently, Omni Viewer App was updated on November 9, 2026 and OnePreview on November 9, 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.*