# Mermaid Editor vs Preloop

The clearest difference is in-app purchases: Preloop at none against Mermaid Editor's 3. Preloop also leads on ads (none vs shown) and rating (5.0 vs 4.7). Mermaid Editor's advantage is update cadence (every 5 days vs every 3 months) and ratings volume (13 vs 1). On price, monetization model and device support there is nothing between them.

Both are free to download. Mermaid Editor sells 3 in-app purchases, starting at $2.99 per month. Preloop asks for nothing beyond the download.

Preloop holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Mermaid Editor has 13 ratings behind it against 1, so its average is the more settled of the two.

Mermaid Editor ships an update every 5 days, Preloop every 3 months. The most recent releases landed on November 9, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Mermaid Editor | Preloop |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (13 ratings)](https://appshunter.io/ios/app/mermaid-editor-mmchart-live/id6757735761/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/preloop/id6757803021/reviews)** |
| Number of ratings | **13** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 5 days** | Every 3 months |
| Monetization | Free | Free |
| Size | 40 MB | 4 MB |
| Requires iOS | **13.0** | 18.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [TERMUX LIMITED LIABILITY COMPANY](https://appshunter.io/developer/1849572138) | [Spacecode AI Inc](https://appshunter.io/developer/1854261683) |

## What reviewers say

### Mermaid Editor

[App page](https://appshunter.io/ios/app/mermaid-editor-mmchart-live/id6757735761)

Create and visualize complex diagrams on your mobile device with a powerful editor. Supports real-time previews, syntax highlighting, and a wide range of chart types. Export your work in various formats and manage files locally.

**Highlights:** Real-time live preview, Full syntax highlighting, Support for all chart types, Template gallery for learning, Powerful file management, Professional export options, Offline mode support

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mermaid Pro Monthly | $2.99 | per month |
| Mermaid Pro | $12.99 | per year |
| Mermaid Lifetime | $34.99 | one-time |


### Preloop

[App page](https://appshunter.io/ios/app/preloop/id6757803021)

This app acts as a human approval layer for AI agents, intercepting risky actions and routing them for your one-tap approval. It allows AI to handle routine tasks while you maintain control over critical decisions, ensuring compliance and an audit trail.

**Highlights:** Human approval for AI actions, Instant notifications with context, One-tap approve/decline, Audit trail for compliance, Risk-based policy enforcement, Works with Claude and Cursor

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Mermaid Editor free?

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

### Is Preloop free?

Preloop is free to download, with no in-app purchases.

### Which has better reviews, Mermaid Editor or Preloop?

Preloop is rated higher. Mermaid Editor averages 4.7 out of 5 from 13 ratings, while Preloop averages 5.0 from 1 ratings.

### Do Mermaid Editor or Preloop have ads?

Mermaid Editor shows ads; Preloop does not.

### Which is updated more often, Mermaid Editor or Preloop?

Mermaid Editor ships an update every 5 days, and Preloop every 3 months. Most recently, Mermaid Editor was updated on November 9, 2026 and Preloop on November 5, 2026.

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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.*