Comparison

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.

Head to head
About

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.

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
Read full description

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

About

Simple Sequence Diagram AI

Features
Read full description

This app allows you to easily create sequence diagrams. Simply describe what you want to visualize, and the latest AI technology will automatically generate a sequence diagram for you. Visualizing information with sequence diagrams is useful for organizing complex processes and interactions. It helps stakeholders understand how systems and processes work, making sequence diagrams valuable in a wide range of situations. However, creating them manually can take time. With this app, you can create sequence diagrams quickly and efficiently. Even if you only provide a rough description of the sequence you want to create, the app can generate a diagram for you. You can also provide more detailed instructions and make adjustments as needed. It can be used in various situations such as: - Visualizing API communication flows in software development - Managing flows from user registration and authentication to service usage - Organizing data transmission and response processes in web services - Managing and visualizing customer support inquiry flows - Designing email and notification system workflows - Visualizing interactions between microservices - Organizing complex approval workflows in business processes - Visualizing user interaction flows in e-commerce systems - Visualizing the process from ordering to delivery in supply chains Please try it whenever you need to create a sequence diagram. [Features] - Intuitive operation Ease of use is important. The app runs smoothly and allows you to edit sequence diagrams intuitively. - Ready to use You can start using the app immediately without creating an account. - Cloud storage support Use cloud storage to save and edit your sequence diagram data across multiple devices. - Export and Share Export and share your sequence diagrams, or use the exported data in other environments. - Import Import exported sequence diagram files and continue editing them. - Text-based editing Edit your sequence diagrams directly using Mermaid notation. - Dark theme support The app supports a dark theme, making it comfortable to use even in low-light environments.

Screenshots

Runestone Text Editor4 screens
Simple Sequence Diagram AI4 screens

Verdict

The call

The clearest difference is chart position: Runestone Text Editor at #40 against Simple Sequence Diagram AI's #200. 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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 16, 2026 and October 12, 2026 respectively.

Scorecard1 real difference · 10 level
Runestone Text Editor versus Simple Sequence Diagram AI: the parameters behind the verdict, then further details
ParameterRunestone Text EditorSimple Sequence Diagram AI
PriceFreeFree
Rating4.7 (2K ratings) — better—
Positive reviews76.0% of reviews—
Number of ratings2K — better—
Update frequencyEvery 2 weeksEvery 2 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
Best chart rank#40 — better#200
DevicesiPhone, iPad, iPod, Vision Pro — betteriPhone, iPad, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size64 MB55 MB
Age rating4+4+
DeveloperSimon B. StøvringYUKI 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
Show 1 more
  • 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
Show 1 more
  • Improved undo/redo functionality

Simple Sequence Diagram AI

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Runestone Text Editor

One-time1
  • Premium$9.99
2 purchases

Simple Sequence Diagram AI

Subscriptions2
  • Simple Sequence Flow Pro (Monthly)$4.991 Month
  • Simple Sequence Flow Pro (Annual)$44.991 Year

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 October 16, 2026 and Simple Sequence Diagram AI on October 12, 2026.
Which is more popular, Runestone Text Editor or Simple Sequence Diagram AI?
Runestone Text Editor currently peaks at #40 in the App Store charts, and Simple Sequence Diagram AI at #200. Chart position reflects recent download velocity rather than total install base.

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