# OnePreview vs Open Docs

The clearest difference is update cadence: OnePreview at weekly against Open Docs's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

OnePreview ships an update weekly, Open Docs every 3 weeks. The most recent releases landed on November 9, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | OnePreview | Open Docs |
| --- | --- | --- |
| 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 | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Monetization | Free | — |
| Size | 9 MB | 50 MB |
| Requires iOS | **17.0** | 18.2 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [培克 罗](https://appshunter.io/developer/1516557687) | [Ho Dung](https://appshunter.io/developer/6805516667) |

## What reviewers say

### 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


### Open Docs

[App page](https://appshunter.io/ios/app/open-docs-document-viewer/id6806442426)

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

**In-app purchases:** none


## Frequently asked questions

### Is OnePreview free?

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

### Is Open Docs free?

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

### Do OnePreview or Open Docs have ads?

Neither OnePreview nor Open Docs shows ads.

### Which is updated more often, OnePreview or Open Docs?

OnePreview ships an update weekly, and Open Docs every 3 weeks. Most recently, OnePreview was updated on November 9, 2026 and Open Docs on November 6, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*