Space DOT vs Merkdown
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Space DOT
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Space DOT 3.0 Features: - Templates for both DOT and Mermaid (Basic templates included. Additional templates can be purchased as in-app purchases.) - Code persistence: Switching between the code editor and the code generator will no longer wipe out your written code. - Layout adjustments: You can now choose for the code editor to appear on the top or bottom (iPhone & iPad), left or right (iPad only), full screen, or to be hidden. - You no longer have to generate code before tapping the render button. You can now simply tap the render button and it will first generate your code automatically. - The code generator tool now features a more compact layout, making it easier to enter information for multiple nodes. - Space DOT now outputs larger image files. Unleash the Power of Graphviz and Mermaid on Your iPhone and iPad. Space DOT version 3 transforms your mobile device into a powerful, professional-grade environment for creating and visualizing directed and undirected graphs using the industry-standard DOT and Mermaid languages. Perfect for engineers, data scientists, architects, and students, Space DOT is the ultimate tool for turning code into clear, elegant diagrams, all powered by an offline, high-performance WebAssembly engine. Offline Code Editor & Real-Time Preview Pure graphing Power: Write or paste your DOT or Mermaid language code in a distraction-free text editor. Instant Visualization: See your graph render in real-time. Hit "Render" to instantly generate high-quality SVG/PNG diagrams. High-Fidelity Rendering: Powered by an embedded, offline rendering engine engine, ensuring professional-grade layouts and accuracy. Interactive & Intelligent Graph Analysis Tap-to-Zoom: Tap any node in the rendered graph to instantly "zoom" into a neighborhood view, highlighting only its immediate neighbors and their connecting edges. This critical feature allows for fast, focused analysis of complex structures without re-rendering the entire graph. Fluid Gestures: Enjoy native iOS support for pinch-to-zoom and pan gestures on the graph preview. Automatic background saving ensures your DOT and Mermaid source files are always up to date. Import/Export: Easily import existing .dot or .gv files from the iOS file system. Share Anywhere: Export your finished graphs as crisp SVG or high-resolution PNG files directly to your preferred sharing service. Reference Dictionaries: Built-in, responsive, searchable libraries of DOT and Mermaid syntax, automatically switching, depending on which graphing language is selected. Code Generator Mode: Switch from the code editor to a user-friendly, form-based interface for DOT. Create nodes, edges, and attributes without writing a single line of codeβSpace DOT generates the DOT source for you. If you're not familiar with nodes and edges, you can now choose from a selection of templates for a variety of different graphing needs! Write the code. See the system. Whether you're mapping out network topology, sketching a system architecture, or studying algorithms, Space DOT provides the speed, reliability, and features you need to master graph visualization on the go.
Merkdown
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Merkdown is a clean, powerful Markdown editor with built-in Mermaid diagram support and AI-powered content generation. Write and preview Markdown in real time, create beautiful diagrams, and let AI help you generate content β all in one app. KEY FEATURES Markdown Editor Write Markdown with a clean, distraction-free editor. Switch between Edit and Preview tabs instantly. Autosave keeps your work safe. Mermaid Diagrams Create flowcharts, sequence diagrams, class diagrams, state diagrams, ER diagrams, Gantt charts, pie charts, mindmaps, timelines, and more β 14 diagram types rendered right in the preview. AI Content Generation Let AI write Markdown and Mermaid diagrams for you. Describe what you need, choose a diagram type, and generate content instantly. Powered by advanced AI technology. Share & Export Export your work as Markdown (.md), HTML (.html), or Image (.png). Share with anyone directly from the app. HIGHLIGHTS - Real-time Markdown preview - 14 Mermaid diagram types supported - AI-powered Markdown and diagram generation - Export as Markdown, HTML, or PNG image - Open .md files from other apps - Dark mode support - Autosave option - Available in 8 languages - Free to use (watch ads for AI coins) Write it down. Mermaid it out. Merkdown.
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Verdict
The clearest difference is in-app purchases: Merkdown at none against Space DOT's 6. Space DOT's advantage is update cadence (every 9 days vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Space DOT sells 6 one-off in-app purchases. Merkdown asks for nothing beyond the download.
Space DOT ships an update every 9 days, Merkdown every 3 months. The most recent releases landed on September 10, 2026 and September 13, 2026 respectively.
| Parameter | Space DOT | Merkdown |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 days β better | Every 3 months |
| Ads | Yes | Yes |
| In-app purchases | Yes | No β better |
| Devices | iPhone, iPad β better | iPhone |
| Requires iOS | 16.2 | 16.0 β better |
| Further details β not scored | ||
| Size | 16 MB | 33 MB |
| Age rating | 4+ | 17+ |
| Developer | Space Japan Studios | HYUNWOO LEE |
In-app purchases
Space DOT
- Remove Ads$0.99
- Technology Templates (Space DOT)$1.99
- Creativity Templates (Space DOT)$1.99
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- Business Templates (Space DOT)$1.99
- Duo-Pack$2.99
- Professional Suite (Space DOT)$2.99
Merkdown
No in-app purchases









