# PrivyMermaid: AI Diagram — Generate, Fix & Edit Diagrams

> Offline, privacy-focused editor for generating and editing Mermaid diagrams. (iPhone/iPad app by GUOYU WANG.)

- Source: https://appshunter.io/ios/app/privymermaid-ai-diagram/id6758518978 (this page in markdown: same URL + `.md`)
- Developer: [GUOYU WANG](https://appshunter.io/developer/1873302677)
- Category: Developer Tools, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.0 · 38 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2026-02-05
- Data updated: 2026-09-02
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/privymermaid-ai-diagram/id6758518978/reviews.md

## What is PrivyMermaid?

PrivyMermaid is a privacy-focused diagram editor for developers, technical writers, and teams who work with Mermaid and D2. Create, import, edit, organize, preview, and export diagrams on your iPhone or iPad.

The Mermaid and D2 renderers are bundled in the app, so you can keep working without an internet connection. Your diagrams stay on your device by default; no diagram source is sent to a rendering service.

Key Features:
Mermaid + D2, fully offline

Two diagram languages: Create and preview Mermaid or D2 diagrams, including flowcharts, sequence diagrams, Gantt charts, architecture diagrams, and more.
Local rendering: Visualize diagrams without an internet connection. The rendering engines run in the app, not on a diagram server.
Import and export: Work with Mermaid (.mmd) and D2 (.d2) source files, then export SVG, PNG, PDF, or GIF.

Projects and templates

Organize your work: Keep diagrams in native projects and switch between documents quickly.
Built-in templates: Start from ready-made diagram examples, clearly labeled for Mermaid or D2.
Live preview and themes: See manual edits immediately and choose a Mermaid or D2 theme plus your preferred preview background.

Privacy on your terms
Local by default: Diagrams are stored locally and no account is required for offline editing.
Optional Diagram Cloud sync: If you choose to sign in, diagrams can sync to your Diagram Cloud account. Your local copy remains available offline.

Why PrivyMermaid?
Keep technical documentation close at hand without depending on a browser tab or a hosted rendering service. PrivyMermaid is a lightweight, private way to diagram on the go.

Note: For AI-assisted Mermaid and D2 generation, questions, and fixes using your local LLM, check out PrivyMermaid Pro (in-app: tap the Pro tab or open the Pro panel; or download the separate PrivyMermaid Pro app).

## Key features

- 100% Private & Offline diagram editing
- Instant offline diagram rendering
- No cloud sync for enhanced data privacy
- Live preview of diagram changes
- Multiple theme selections
- Full Mermaid syntax support

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| native macOS version | $9.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/privymermaid-ai-diagram/id6758518978/reviews.md

### 4/5 — Good Idea, but missing one crucial feature

*2026-07-18*

I had to delete the app because it was missing one crucial feature. However, I’m still leaving 4 stars since the app in the current state is built well and that missing feature could be implemented very easily in future.

The missing feature is: *allow users to zoom in and move preview canvas around*. Ideally, you would also allow to move nodes around, but I understand that this could be a bit more difficult to implement.

My diagrams were a bit complicated and big, so the entire canvas zoomed out too much, making things unreadable.

## Frequently asked questions about PrivyMermaid

### Does PrivyMermaid have ads?

No, PrivyMermaid is completely ad-free, allowing for an uninterrupted user experience.

### What devices does PrivyMermaid support?

PrivyMermaid is available on macOS, iPhone, and iPad, providing flexibility for users across different Apple platforms.

### How often is PrivyMermaid updated?

The latest version is 0.7.3, and the app was last updated on July 19, 2026, indicating active development and maintenance.

### What is the age rating for PrivyMermaid?

PrivyMermaid has an age rating of 4+, making it suitable for a wide range of users, including younger developers and students.

### Can I generate diagrams with AI in PrivyMermaid?

The free version of PrivyMermaid offers standard live preview for manual edits. For AI-assisted diagram generation and refactoring using local LLMs, the Pro version is available.

### What types of diagrams can I create with PrivyMermaid?

PrivyMermaid supports full standard Mermaid syntax, including Flowcharts, Sequence diagrams, Gantt charts, and more, allowing for diverse diagram creation.

### Is PrivyMermaid suitable for proprietary systems?

Yes, PrivyMermaid is designed for security-conscious users and works completely offline, ensuring that sensitive architecture diagrams and proprietary system information never leave your device.

## Version history (last 5 releases)

### 0.10.0 — 2026-08-26

Ten languages — The interface is now translated into English, Spanish, French, German, Brazilian Portuguese, Japanese, Korean, Simplified Chinese, Traditional Chinese, and Italian.
Translated template library — Every template category, name, and description is translated, so browsing for the right starting point works in your language too.

Per-app language picker — Settings ▸ Appearance ▸ Language lets you run PrivyMermaid in a language of its own, independently of the rest of your device. Choose System to follow your device setting.

Sensible language matching — Regional variants land where you would expect: Traditional Chinese for Taiwan, Hong Kong, and Macau, and Brazilian Portuguese for other Portuguese regions.

Your diagrams stay yours — Diagram source is never translated, and existing diagrams and projects keep working unchanged when you switch languages.

### 0.9.0 — 2026-08-12

PlantUML support — Create, import, preview, and export PlantUML diagrams alongside Mermaid and D2.

Graphviz support — Create, import, preview, and export Graphviz DOT diagrams alongside the other supported languages.

Four diagram languages in one app — Start a new diagram in Mermaid, D2, PlantUML, or Graphviz.

Expanded file imports — Open PlantUML files such as .puml, .plantuml, .pu, and .uml, plus Graphviz files such as .dot, .gv, and .graphviz.

Format-aware sharing and exports — Export PlantUML and Graphviz diagrams as SVG, PNG, PDF, or GIF, or share their source files in the matching format.

Improved source highlighting — PlantUML and Graphviz source now have language-aware syntax highlighting.

### 0.8.1 — 2026-08-08

D2 diagram support — Create, import, edit, preview, and export D2 files alongside Mermaid diagrams.
Projects and files — A new native Projects tab keeps diagrams organized in folders. Search files, rename or delete diagrams, create projects, and move files between projects or Ungrouped.
Diagram Cloud account — Sign in with a secure email link, GitHub, or Google. There are no keys or Supabase setup steps to configure.
Automatic cloud backup — After signing in, locally saved diagrams automatically sync to your Diagram Cloud Ungrouped project. Your local copy remains available if you are offline.
Better template browsing — Templates now show their intended use tags and whether they use Mermaid or D2.

### 0.8.0 — 2026-08-07

D2 diagram support — Create, import, edit, preview, and export D2 files alongside Mermaid diagrams.
Projects and files — A new native Projects tab keeps diagrams organized in folders. Search files, rename or delete diagrams, create projects, and move files between projects or Ungrouped.
Diagram Cloud account — Sign in with a secure email link, GitHub, or Google. There are no keys or Supabase setup steps to configure.
Automatic cloud backup — After signing in, locally saved diagrams automatically sync to your Diagram Cloud Ungrouped project. Your local copy remains available if you are offline.
Better template browsing — Templates now show their intended use tags and whether they use Mermaid or D2.

### 0.7.4 — 2026-07-26

- **Unlock Pro inside the app** — A one-time in-app purchase unlocks every Pro feature, and "Restore Purchases" brings them back on your other devices.
- **More AI backends (Pro)** — Once unlocked, connect to Ollama, LM Studio, or any custom OpenAI-compatible endpoint, with an optional API token stored securely in the device Keychain.
- **Ask with images (Pro)** — Attach screenshots or photos to your questions and chat about them with vision-capable models.
- **Nicer AI answers (Pro)** — Responses now render as formatted Markdown, with a collapsible "Thinking" section for reasoning models.
- **Refreshed chat (Pro)** — Your messages appear on the right as "You", with clearer, simplified messages when a server can't be reached.
- **Cleaner Settings & About** — Simplified privacy summary, a built-in Privacy Policy link, and a dedicated About screen.
- **Private and offline as always** — Diagrams stay on your device. No accounts, no tracking, no telemetry.

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## More apps by GUOYU WANG

- [FlightLedger](https://appshunter.io/ios/app/flightledger/id6758533176)
- [PrivyPDF: PDF Agent](https://appshunter.io/ios/app/privypdf-pdf-agent/id6758668283)
- [PrivyFeed: News Butler](https://appshunter.io/ios/app/privyfeed-news-butler/id6758854675)
- [PrivyMermaid Pro: AI Diagram](https://appshunter.io/ios/app/privymermaid-pro-ai-diagram/id6759026916)
- [Tenmo](https://appshunter.io/ios/app/tenmo/id6759307802)

All apps by GUOYU WANG: https://appshunter.io/developer/1873302677

## Related topics

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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 2026-09-02.*