One Markdown vs Merkdown
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
One Markdown
A fast and simple editor for plain text, Markdown, and Textbundle formats. It offers full Markdown display, image previews, math formula rendering, and extensive customization options for themes and fonts. Includes tools for syntax input, table generation, and document outlining.
- Supports CommonMark and GitHub Flavored Markdown
- Full Markdown document display
- Image and math formula previews
- Customizable themes and fonts
- Markdown syntax input menu and keyboard
- Outline and word count view
- Editor & Preview mode
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One Markdown is a simple and fast editor that supports plain text, Markdown and Textbundle. It has the following features: * Base on CommonMark syntax and GitHub Flavored Markdown (GFM) extended syntax, supporting TOC, tables, code blocks, math formulas, task lists, footnotes, etc. * Display the text of the Markdown document completely without any deletion. * Images can be displayed directly in the Editor, supporting jpg, png, gif, webP, HEIC and etc. * Math formulas, mermaid and Echarts drawings can be previewed in the editor. * You can set your favorite font or multiple fonts for writing. * You can choose from 11 light themes and 21 dark themes, and also support custom themes. * There is a menu to facilitate the input of Markdown syntax, and a special Markdown syntax keyboard is also provided in iOS. * Convenient tools for generating and formatting Markdown table syntax. * You can view the outline and word count of Markdown documents. * Markdown documents can be previewed and support Editor & Preview mode. Terms of Use: https://www.mweb.im/onemarkdown-terms.html Privacy Policy: https://www.mweb.im/onemarkdown-policy.html PS: The lightweight choice is One Markdown. If you need a complete and powerful app, please take a look at MWeb, I hope you like it!
Merkdown
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Merkdown is a clean, powerful Markdown editor with built-in Mermaid diagram support and AI-powered content generation. Write and preview Markdown in real time, create beautiful diagrams, and let AI help you generate content — all in one app. KEY FEATURES Markdown Editor Write Markdown with a clean, distraction-free editor. Switch between Edit and Preview tabs instantly. Autosave keeps your work safe. Mermaid Diagrams Create flowcharts, sequence diagrams, class diagrams, state diagrams, ER diagrams, Gantt charts, pie charts, mindmaps, timelines, and more — 14 diagram types rendered right in the preview. AI Content Generation Let AI write Markdown and Mermaid diagrams for you. Describe what you need, choose a diagram type, and generate content instantly. Powered by advanced AI technology. Share & Export Export your work as Markdown (.md), HTML (.html), or Image (.png). Share with anyone directly from the app. HIGHLIGHTS - Real-time Markdown preview - 14 Mermaid diagram types supported - AI-powered Markdown and diagram generation - Export as Markdown, HTML, or PNG image - Open .md files from other apps - Dark mode support - Autosave option - Available in 8 languages - Free to use (watch ads for AI coins) Write it down. Mermaid it out. Merkdown.
Screenshots
Verdict
The clearest difference is in-app purchases: Merkdown at none against One Markdown's 3. One Markdown's advantage is ads (none vs shown) and update cadence (monthly vs every 3 months). On price there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. One Markdown sells 3 in-app purchases, starting at $3.99 per year. Merkdown asks for nothing beyond the download.
One Markdown ships an update monthly, Merkdown every 3 months. The most recent releases landed on September 21, 2026 and September 13, 2026 respectively.
| Parameter | One Markdown | Merkdown |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (141 ratings) — better | — |
| Positive reviews | 81.9% of reviews | — |
| Number of ratings | 141 — better | — |
| Update frequency | Monthly — better | Every 3 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone |
| Requires iOS | 14.5 — better | 16.0 |
| Further details — not scored | ||
| Size | 50 MB | 33 MB |
| Age rating | 4+ | 17+ |
| Developer | 禄海 区 | HYUNWOO LEE |
In-app purchases
One Markdown
- One Markdown Yearly Subscribe$3.991 Year
- One Markdown for Mac$9.99
- One Markdown for iPhone/iPad$9.99
Merkdown
No in-app purchases









