# MarkChart vs Simple Sequence Diagram AI

The clearest difference is iOS requirement: Simple Sequence Diagram AI at 15.6 against MarkChart's 18.2. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. MarkChart sells 1 one-off in-app purchase and Simple Sequence Diagram AI sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

MarkChart ships an update every 3 weeks, Simple Sequence Diagram AI every 2 weeks. Both last shipped on October 27, 2026.

## The numbers

| Metric | MarkChart | Simple Sequence Diagram AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (14 ratings)](https://appshunter.io/ios/app/markchart-mermaid-editor/id6475648822/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 72.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 56 MB | 55 MB |
| Requires iOS | 18.2 | **15.6** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alexandre Colucci](https://appshunter.io/developer/1478787437) | [YUKI TANAIKE](https://appshunter.io/developer/478558546) |

## What reviewers say

### MarkChart

[App page](https://appshunter.io/ios/app/markchart-mermaid-editor/id6475648822)

This app allows you to easily create and preview diagrams using a Markdown-inspired text syntax. It offers templates for various diagram types and supports automatic updates when used with external editors. Export your creations to common image formats.

**Highlights:** Mermaid diagram editing, Real-time preview, Built-in templates, Automatic updates, Export to PDF, PNG, SVG, Syntax highlighting, Dark Mode support

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MarkChart Pro | $12.99 | one-time |


### Simple Sequence Diagram AI

[App page](https://appshunter.io/ios/app/simple-sequence-diagram-ai/id6711357061)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Simple Sequence Flow Pro (Monthly) | $4.99 | per month |
| Simple Sequence Flow Pro (Annual) | $44.99 | per year |


## Frequently asked questions

### Is MarkChart free?

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

### Is Simple Sequence Diagram AI free?

Simple Sequence Diagram AI is free to download, with in-app purchases available.

### Do MarkChart or Simple Sequence Diagram AI have ads?

Neither MarkChart nor Simple Sequence Diagram AI shows ads.

### Which is updated more often, MarkChart or Simple Sequence Diagram AI?

MarkChart ships an update every 3 weeks, and Simple Sequence Diagram AI every 2 weeks. Most recently, MarkChart was updated on October 27, 2026 and Simple Sequence Diagram AI on October 27, 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.*