Comparison

MermaidEditor vs Slint Viewer

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Mermaid-js syntax highlighting
  • Code completion
  • Instant preview
  • Export to PNG/SVG
  • Cross-device editing
  • QuickLook preview extension
Features
Read full description

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.

About

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.

Highlights
  • Live UI preview on iOS
  • Connects to code editor
  • Real-time design updates
  • Supports Slint toolkit
Features
Read full description

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

MermaidEditor3 screens
Slint Viewer1 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard9 real differences · 2 level
MermaidEditor versus Slint Viewer: the parameters behind the verdict, then further details
ParameterMermaidEditorSlint Viewer
Price$3.99Free — better
Rating2.3 (10 ratings)5.0 (1 ratings) — better
Positive reviews13.8% of reviews100.0% of reviews — better
Number of ratings10 — better1
Update frequencyEvery 3 weeks — betterEvery 6 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank#111 — better—
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS14.0 — better16.6
Further details — not scored
Size125 MB49 MB
Age rating4+4+
Developer基伟 徐SixtyFPS GmbH

Customer experience

MermaidEditor

All ratings10 ratings
Positive30.0%
Neutral0.0%
Negative70.0%
Written reviews29 reviews
Positive13.8%
Neutral13.8%
Negative72.4%

Slint Viewer

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

MermaidEditor

No in-app purchases

None

Slint Viewer

No in-app purchases

Questions

Is MermaidEditor free?
MermaidEditor costs $3.99, with no in-app purchases.
Is Slint Viewer free?
Slint Viewer is free to download, with no in-app purchases.
Which has better reviews, MermaidEditor or Slint Viewer?
Slint Viewer is rated higher. MermaidEditor averages 2.3 out of 5 from 10 ratings, while Slint Viewer averages 5.0 from 1 ratings.
Do MermaidEditor or Slint Viewer have ads?
Neither MermaidEditor nor Slint Viewer shows ads.
Which is updated more often, MermaidEditor or Slint Viewer?
MermaidEditor ships an update every 3 weeks, and Slint Viewer every 6 weeks. Most recently, MermaidEditor was updated on October 22, 2026 and Slint Viewer on October 14, 2026.

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