# MermaidEditor — Write diagram on all devices

> Mermaid-js diagram and chart editor for Apple devices. (iPhone/iPad app by 基伟 徐.)

- Source: https://appshunter.io/ios/app/mermaideditor/id1581312955 (this page in markdown: same URL + `.md`)
- Developer: [基伟 徐](https://appshunter.io/developer/391905315)
- Category: Developer Tools, Productivity
- Price: $3.99
- Rating: 2.30/5 from 10 App Store ratings · 29 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.0 · 125 MB
- Languages: American English
- Released: 2021-08-15
- Data updated: 2026-08-26
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/mermaideditor/id1581312955/reviews.md

## What is MermaidEditor?

MermaidEditor is a diagram and chart editor, powered by mermaid-js. And MermaidEditor supports iPhone, iPad and Mac, with one app you can edit diagram everywhere on any device.

MermaidEditor supports mermaid-js syntax highlighting and code completion, so it can help writing diagram and chart clearly, easily and quickly.

You can also easily export charts as PNG images or SVG files from the editor, or share image to other people with system actions.

√ All Platforms

- Both Mobile and Desktop platforms supported, you can edit diagram documents on iPhone, iPad or Mac
- Document browser based app, easily edit files on device and sync document between devices
- Multiple windows ready, it makes the editor more powerful on iPadOS
- Keyboard shortcuts ready on iPadOS with keyboard connected

√ Powerful Editor

- Syntax Highlighting for mermaid-js grammar
- Auto Completion in editor helps typing keywords quickly
- Code Snippets likes parallel block in sequence diagram makes life easier
- Instant Parsing Error indicator for locating syntax error

√ Instant Preview

- Auto Generated Preview when typing in editor
- Zoom and Pan to move preview for checking diagram's detail
- With Scroll wheel it can be easily zoom diagram on macOS

√ Integrated Extensions

- Thumbnail support, every .mmd file will has its own thumbnail when saving file
- QuickLook Preview extension helps you preview mermaid document in Files app on iPhone or iPad and Finder on macOS

√ Sharing

- Save diagram document as its source with .mmd extension
- Export diagram to PNG image or SVG file with one click

For mermaid-js grammar, please visit https://mermaid-js.github.io/mermaid/ for documentation.

## Key features

- Mermaid-js syntax highlighting
- Code completion
- Instant preview
- Export to PNG/SVG
- Cross-device editing
- QuickLook preview extension

## Chart rankings

- #122 in Top Paid · Developer Tools (US App Store)

## Recent user reviews (10 of 29)

All indexed reviews: https://appshunter.io/ios/app/mermaideditor/id1581312955/reviews.md

### 1/5 — Doesn't work

*2026-07-10, version 1.8.2*

Wouldn't even display a simple class diagram. Broken...

### 1/5 — It’s a pity

*2025-09-07*

Doesn’t work at all

### 1/5 — Doesn’t actually work

*2025-08-24, version 1.8.2*

No support for flow diagrams and I suspect an old mermaid library. Please fix

### 5/5 — Works great but you need a trick

*2025-08-07, version 1.8.1*

Design the diagram in AI like DeepSeek.  Copy the code. Open mermaid documents. Press and hold and press paste. Test.txt is created. Press and hold rename to name.mmd. Select use mmd and not text. Open and it works. Use this in your prompt to AI chat:  **Mermaid Rules for My Editor**  
1. **Types**: Only `flowchart TD/LR`, `erDiagram`, `mindmap`  
2. **Syntax**:  
   - No `#`, `---`, `\n`, emojis, or Unicode  
   - Labels: `"quoted"` only  
3. **Style**:  
   - Max 2 `classDef` (e.g., `fill:#f9f9f9,stroke:#333`)  
4. **File Handling**:  
   - Paste raw → Save as `.txt` → Rename to `.mmd`

### 1/5 — Doesn't work

*2025-05-29, version 1.8.1*

Tried two diagrams that work elsewhere
didn't work.
likely old mermaid lib. No refund. V lame

### 1/5 — Doesn’t open Mermaid files.

*2025-02-22, version 1.8.1*

The irony of this app being called Mermaid Editor but not actually being able to gracefully open files with the .mermaid extension is laughable.

### 2/5 — Trackpad Support Needs Improvement

*2025-02-17*

I can’t scroll with a two-finger swipe on the trackpad, which makes it pretty inconvenient to use.

### 1/5 — ペーストできない

*2025-01-29*

ペーストできないアプリなんて使えない

### 3/5 — Integration beschraenkt

*2025-01-22*

Kann leider nur .mmd Dateien öffnen und keine .mermaid. Laut Versionsverlauf sollte es auch ein quicklook plugin geben, aber das scheint nicht zu funktionieren.
Entgegen einer anderen Rezension kann man Dateien öffnen und speichern.

### 1/5 — That's a bad program. They're scammers too

*2024-12-19, version 1.8.1*

This program is very poor. The operators are scammers and dishonest.

## Frequently asked questions about MermaidEditor

### What devices does MermaidEditor support?

MermaidEditor is available for Mac, iPhone, and iPad. It leverages document browser capabilities for seamless editing across these platforms.

### How does MermaidEditor help with writing diagrams?

MermaidEditor offers syntax highlighting and code completion specifically for mermaid-js grammar, making it easier and faster to write clear diagrams.

### Can I export my diagrams from MermaidEditor?

Yes, you can easily export your charts as PNG images or SVG files with a single click directly from the editor.

### What is the pricing for MermaidEditor?

MermaidEditor is a paid application, priced at $3.99. There are no in-app purchases or ads.

### How often is MermaidEditor updated?

The app was last updated on August 10, 2025, indicating active development. The current version is 1.8.2.

### What is the user sentiment for MermaidEditor?

MermaidEditor has an average rating of 2.3 stars from 10 ratings, suggesting mixed user satisfaction.

### Is MermaidEditor suitable for younger users?

MermaidEditor has an age rating of 4+, making it generally appropriate for younger users, though its functionality is geared towards technical diagram creation.

### Does MermaidEditor have a preview feature?

Yes, MermaidEditor provides an instant preview that auto-generates as you type. You can zoom and pan the preview to inspect diagram details.

## Version history (last 5 releases)

### 1.8.2 — 2025-08-10

- Updated mermaidjs to 1.8.2

### 1.8.1 — 2024-05-25

Updated mermaid.js to v10.9.1

### 1.8.0 — 2023-07-28

- Added code block folding feature to the text editor

### 1.7.0 — 2023-07-10

- mermaid updated to v10.2.4
- Added templates for Git, Mindmap, Guadrant, Requirement diagrams

### 1.6.0 — 2023-05-23

- Update mermaid to v10.1.0

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## More apps by 基伟 徐

- [PPI Guru - Calc PPI Easily](https://appshunter.io/ios/app/ppi-guru-calc-ppi-easily/id1514324923)
- [Power JSON Editor Mobile](https://appshunter.io/ios/app/power-json-editor-mobile/id1557433043)

All apps by 基伟 徐: https://appshunter.io/developer/391905315

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*