# OnePreview vs Marklens

OnePreview and Marklens both sit at 5.0 stars, but that hides the real split: 100% of OnePreview's written reviews are positive against 0% of Marklens's. OnePreview also leads on update cadence (weekly vs monthly). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for OnePreview against 5.0 for Marklens. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews are what separate them: 100% of OnePreview's written reviews are positive against 0% of Marklens's.

OnePreview ships an update weekly, Marklens monthly. The most recent releases landed on October 18, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | OnePreview | Marklens |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/onepreview-file-viewer/id6760284919/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/marklens-markdown-reader/id6775853573/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Monthly |
| Monetization | Free | Free |
| Size | 9 MB | 4 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone, iPad, Mac | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [培克 罗](https://appshunter.io/developer/1516557687) | [Donald Jackson](https://appshunter.io/developer/6775853575) |

## What reviewers say

### OnePreview

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

This app allows you to preview and interact with various developer file formats, including Markdown, code, databases, and archives, directly on your iPhone and iPad. It offers local processing for speed and privacy, with features like PDF export and structured data inspection.

**Highlights:** Markdown and MDX rendering, JSON, YAML, XML, CSV, TSV, TOML, ENV parsing, SQLite database inspection, Source code and log viewing, ZIP and TAR.GZ archive content preview, Mermaid diagrams and KaTeX math rendering, A4 PDF export for Markdown files

**Features:** Vision Pro support

**In-app purchases:** none


### Marklens

[App page](https://appshunter.io/ios/app/marklens-markdown-reader/id6775853573)

This app is a fast, native Markdown viewer for macOS, iPadOS, and iPhone. It renders .md files instantly with beautiful typography, themes, syntax highlighting, and diagrams. Designed for reading, it offers a private and friction-free experience.

**Highlights:** Instant Markdown rendering, Syntax highlighting for 30+ languages, Mermaid diagram support, GitHub-Flavored Markdown, Light and dark themes, Export to PDF, Quick Look preview on macOS

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is OnePreview free?

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

### Is Marklens free?

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

### Which has better reviews, OnePreview or Marklens?

OnePreview and Marklens are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do OnePreview or Marklens have ads?

Neither OnePreview nor Marklens shows ads.

### Which is updated more often, OnePreview or Marklens?

OnePreview ships an update weekly, and Marklens monthly. Most recently, OnePreview was updated on October 18, 2026 and Marklens on October 7, 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.*