Runestone Text Editor vs Simple Sequence Diagram AI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Runestone Text Editor
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.
- 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
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A plain text editor with syntax highlighting, line numbers, search and replace, page guide, and much more. It's like TextEdit but more powerful and optimised for iPhone and iPad. Runestone is made by a single person with a love for text editors and a vision of building the most lightweight text editor for iPhone and iPad that still has the core features for editing code. Features: - Syntax highlighting of many languages including HTML, JavaScript, JSON, Markdown, Swift, Python, PHP, YAML, and many more. - Select one of the twelve standard themes including popular themes like Tomorrow, Dracula, Solarized, and One Dark Pro. - Innovative find and replace for searching and modifying text while still viewing your file. - Choose font and font size, including support for custom fonts imported using another third-party app. - Show the line and column the cursor is located on. - Uses the standard document browser for an experience similar to the Files app. - Quickly navigate to a specific line. - Automatically close opening brackets and quotes. - Multiple windows on the iPad. - Format code using Prettier.js. Supported languages include CSS,HTML, JavaScript, JSON, PHP and more. - Choose text encoding between popular encodings like UTF-8, UTF-16, ISO Latin 1, and many more. - Enable or disable autocorrection, autocapitalization, and smart punctuation. - Set default file extension of new files. - Open files in Runestone from the Share Sheet. - Print documents. Premium features: - Choose between eight app icons. - Show line numbers. - Highlight the selected line. - Increase line height and letter spacing. - Disable line wrapping to allow horizontal scrolling. - Show tabs, spaces, and line breaks using a selected symbol. - Enable page guide at a specific column to easily tell when lines are getting too long. - Add vertical and horizontal overscroll. - Remember the selected language per file. - Save file extensions and filenames that should always be treated as plain text files. - Enable soft tabs and choose the width of the tab character. - Specify whether pressing the tab key should insert a tab or indent the line. - Adjust the scaling of Markdown headings and disable highlighting of code blocks in Markdown. Runestone was built on the open-source framework with the same name. Find more information on the Runestone framework at github.com/simonbs/runestone
Simple Sequence Diagram AI
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This app allows you to easily create sequence diagrams. Simply describe the content you want to visualize, and the latest AI technology will automatically generate the diagram for you. Visualizing with sequence diagrams is crucial for organizing complex ideas. It helps ensure that all stakeholders understand the content, making it valuable in various scenarios. However, creating such diagrams manually can be time-consuming. With this app, you can generate sequence diagrams quickly and efficiently. Even with a rough outline, the app will automatically generate a sequence diagram, and you can make detailed adjustments as needed. It is used in various situations such as: - Visualizing API communication flows in software development - Managing user registration, authentication, and service usage flows - Structuring the flow of data transmission and responses in web services - Managing and visualizing customer support inquiry processes - Designing email and notification system workflows - Visualizing interactions between microservices - Structuring complex approval workflows in business processes - Tracking user interactions in e-commerce systems - Visualizing order to delivery processes in supply chains Please try it out whenever you need to create a sequence diagram. [Features] - Intuitive operability Ease of use is the most important factor. It runs smoothly, and you can intuitively edit your maps. - Ready to use You can use it immediately without registering an account. - Multi-device support It supports Google Drive integration, allowing seamless editing across multiple devices. - Export and Share You can export and share your Flowchart, and even edit them on a PC. - Import Exported files can be imported and edited. - Text-based editing Edit your sequence diagrams directly using Mermaid notation. - Dark theme support Since it supports a dark theme, it is also ideal for use at night.
Screenshots
Verdict
The clearest difference is chart position: Runestone Text Editor at #50 against Simple Sequence Diagram AI's unranked. On price, update cadence, 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
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 23, 2026 and September 9, 2026 respectively.
| Parameter | Runestone Text Editor | Simple Sequence Diagram AI |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (2K ratings) — better | — |
| Positive reviews | 76.1% of reviews | — |
| Number of ratings | 2K — better | — |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Best chart rank | #50 — better | — |
| Devices | iPhone, iPad, iPod, Vision Pro — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 64 MB | 68 MB |
| Age rating | 4+ | 4+ |
| Developer | Simon B. Støvring | YUKI TANAIKE |
Bugs and requests
Runestone Text Editor
Reported bugs
6 issues- Disappearing files
- Difficulty pasting text
- Scroll position not saved
- Hangs on startup
- Trouble opening large files
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- Issues after iOS updates
Requested features
6 requests- Markdown preview
- Code folding
- Syntax highlighting for more languages
- Ability to run/execute code
- Multiple file/window support
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- Improved undo/redo functionality
Simple Sequence Diagram AI
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Runestone Text Editor
- Premium$9.99
Simple Sequence Diagram AI
- Simple Sequence Flow Pro (Monthly)$4.991 Month
- Simple Sequence Flow Pro (Annual)$44.991 Year
Questions
Is Runestone Text Editor free?
Is Simple Sequence Diagram AI free?
Do Runestone Text Editor or Simple Sequence Diagram AI have ads?
Which is updated more often, Runestone Text Editor or Simple Sequence Diagram AI?
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