MermaidEditor vs Slint Viewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MermaidEditor
Create and edit diagrams and charts using mermaid-js syntax with real-time preview. Export your creations as PNG or SVG files and share them across all your Apple devices.
- Mermaid-js syntax highlighting
- Code completion
- Instant preview
- Export to PNG/SVG
- Cross-device editing
- QuickLook preview extension
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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.
Slint Viewer
This developer tool allows you to preview Slint user interfaces directly on your iPhone or iPad. It connects to your code editor over a local network, displaying your .slint designs live as you make changes. Some programming experience is recommended for optimal use.
- Live UI preview on iOS
- Connects to code editor
- Real-time design updates
- Supports Slint toolkit
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Preview Slint user interfaces on your iPhone or iPad with just your computer and this app. Slint Viewer is a developer tool that connects to your code editor over the local network and shows your .slint designs live on the device as you save. Slint (slint.dev) is an open-source toolkit for building native user interfaces in Rust, C++, JavaScript, and Python. Note: this app is intended for developers using Slint; some programming experience is recommended.
Screenshots
Verdict
The clearest difference is review sentiment: Slint Viewer at 100% against MermaidEditor's 14%. Slint Viewer also leads on price (Free vs $3.99) and rating (5.0 vs 2.3). MermaidEditor's advantage is ratings volume (10 vs 1) and chart position (#111 vs unranked). On ads and in-app purchases 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
Slint Viewer is free to download; MermaidEditor costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Slint Viewer holds the better App Store score, 5.0 against 2.3. That said, the two scores are not equally well evidenced: MermaidEditor has 10 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 14% of MermaidEditor's written reviews are positive against 100% of Slint Viewer's.
MermaidEditor ships an update every 3 weeks, Slint Viewer every 6 weeks. The most recent releases landed on October 22, 2026 and October 14, 2026 respectively.
| Parameter | MermaidEditor | Slint Viewer |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 2.3 (10 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 13.8% of reviews | 100.0% of reviews — better |
| Number of ratings | 10 — better | 1 |
| Update frequency | Every 3 weeks — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Best chart rank | #111 — better | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 125 MB | 49 MB |
| Age rating | 4+ | 4+ |
| Developer | 基伟 徐 | SixtyFPS GmbH |
Customer experience
MermaidEditor
Slint Viewer
In-app purchases
MermaidEditor
No in-app purchases
Slint Viewer
No in-app purchases









