# Runestone Text Editor vs Simple Sequence Diagram AI

The clearest difference is chart position: Runestone Text Editor at #40 against Simple Sequence Diagram AI's unranked. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Runestone Text Editor 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.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on September 26, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Runestone Text Editor | Simple Sequence Diagram AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (2K ratings)](https://appshunter.io/ios/app/runestone-text-editor/id1548193893/reviews)** | — |
| Number of ratings | **2K** | — |
| Positive reviews | 76.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#40** | — |
| Size | 64 MB | 68 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | **iPhone, iPad, iPod, Vision Pro** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Simon B. Støvring](https://appshunter.io/developer/423532907) | [YUKI TANAIKE](https://appshunter.io/developer/478558546) |

## What reviewers say

### Runestone Text Editor

[App page](https://appshunter.io/ios/app/runestone-text-editor/id1548193893)

**Currently charting:** #40 Top Free · Developer Tools, #64 Top Grossing · Developer Tools (US App Store)

A powerful plain text and code editor for iPhone and iPad. Offers syntax highlighting, line numbers, find and replace, and extensive customization options for developers and writers.

**Highlights:** Syntax highlighting for many languages, Customizable themes and fonts, Advanced find and replace, Line numbers and cursor location, Code formatting with Prettier.js, Multiple windows on iPad

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $9.99 | one-time |

**What reviewers like**

- 💎 Excellent text editor
- 🚀 Smooth and responsive
- 🎨 Customizable themes and appearance
- 🔒 Secure file storage and sync
- 👍 Clean and intuitive interface

**What reviewers complain about**

- 🐛 Occasional crashes or bugs
- 🔍 Difficulty navigating files/folders
- 📝 Limited functionality without premium
- 🔌 Performance issues on older devices
- 🔒 Difficulty accessing files in cloud storage

**Reported bugs**

- Disappearing files
- Difficulty pasting text
- Scroll position not saved
- Hangs on startup
- Trouble opening large files

**Requested features**

- Markdown preview
- Code folding
- Syntax highlighting for more languages
- Ability to run/execute code
- Multiple file/window support


### 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 Runestone Text Editor free?

Runestone Text Editor 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 Runestone Text Editor or Simple Sequence Diagram AI have ads?

Neither Runestone Text Editor nor Simple Sequence Diagram AI shows ads.

### Which is updated more often, Runestone Text Editor or Simple Sequence Diagram AI?

Runestone Text Editor ships an update every 2 weeks, and Simple Sequence Diagram AI every 2 weeks. Most recently, Runestone Text Editor was updated on September 26, 2026 and Simple Sequence Diagram AI on September 9, 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.*