# MermaidEditor vs Happy

The clearest difference is review sentiment: Happy at 72% against MermaidEditor's 14%. Happy also leads on price (Free vs $3.99) and rating (4.9 vs 2.3). MermaidEditor's advantage is in-app purchases (none vs 1). On ads, chart position, device support and iOS requirement there is nothing between them.

Happy is free to download; MermaidEditor costs $3.99 up front. Happy sells 1 in-app purchase, starting at $19.99 per month. MermaidEditor asks for nothing beyond the download.

Happy holds the better App Store score, 4.9 against 2.3. That said, the two scores are not equally well evidenced: Happy has 1K ratings behind it against 10, 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 72% of Happy's.

MermaidEditor ships an update every 3 weeks, Happy weekly. The most recent releases landed on October 13, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | MermaidEditor | Happy |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [2.3 (10 ratings)](https://appshunter.io/ios/app/mermaideditor/id1581312955/reviews) | **[4.9 (1K ratings)](https://appshunter.io/ios/app/happy-codex-and-claude-code-app/id6748571505/reviews)** |
| Number of ratings | 10 | **1K** |
| Positive reviews | 13.8% of reviews | **71.6% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | #114 | **#82** |
| Size | 125 MB | 98 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [基伟 徐](https://appshunter.io/developer/391905315) | [Bulka, LLC](https://appshunter.io/developer/1677403762) |

## What reviewers say

### MermaidEditor

[App page](https://appshunter.io/ios/app/mermaideditor/id1581312955)

**Currently charting:** #114 Top Paid · Developer Tools (US App Store)

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:** Vision Pro support

**In-app purchases:** none


### Happy

[App page](https://appshunter.io/ios/app/happy-codex-and-claude-code-app/id6748571505)

**Currently charting:** #82 Top Free · Developer Tools (US App Store)

This app provides a secure mobile interface for AI coding assistants, allowing you to continue sessions and monitor progress from anywhere. It features end-to-end encryption and a zero-knowledge architecture for ultimate privacy. Seamlessly switch between desktop and mobile for uninterrupted AI coding.

**Highlights:** Seamless desktop and mobile session continuation, Push notifications for AI tasks, Offline access to conversation history, End-to-end encryption for code privacy, Real-time streaming of AI responses, Zero-knowledge architecture

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Plus Monthly | $19.99 | per month |


## Frequently asked questions

### Is MermaidEditor free?

MermaidEditor costs $3.99, with no in-app purchases.

### Is Happy free?

Happy is free to download, with in-app purchases available.

### Which has better reviews, MermaidEditor or Happy?

Happy is rated higher. MermaidEditor averages 2.3 out of 5 from 10 ratings, while Happy averages 4.9 from 1K ratings.

### Do MermaidEditor or Happy have ads?

Neither MermaidEditor nor Happy shows ads.

### Which is updated more often, MermaidEditor or Happy?

MermaidEditor ships an update every 3 weeks, and Happy weekly. Most recently, MermaidEditor was updated on October 13, 2026 and Happy on October 14, 2026.

### Which is more popular, MermaidEditor or Happy?

MermaidEditor currently peaks at #114 in the App Store charts, and Happy at #82. Chart position reflects recent download velocity rather than total install base.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*