D2 is a concise scripting language that lets you generate diagrams directly from plain text. It focuses on simplicity and readability, making it easy to embed visualizations in documentation and codebases. Designed for self‑hosted environments, D2 runs in the browser and can be integrated into CI pipelines, providing free, on‑premise diagram generation without vendor lock‑in.
PlantUML is a tool that allows users to generate diagrams from textual descriptions. It supports a wide range of diagram types, including sequence diagrams, class diagrams, and state diagrams. Users can write their diagram descriptions in a simple, human-readable syntax, and PlantUML will generate the corresponding diagram.
- Zero cost, fully free
- Self‑hosted for full data control
- Simple, readable syntax reduces learning curve
- Integrates easily with CI pipelines and GitHub
- Easy to use and learn, with a simple and intuitive syntax.
- Highly customizable, with extensive options for diagram appearance and layout.
- Supports a wide range of diagram types and formats.
- Free and open-source, with a large community of users and contributors.
- Limited to 2D diagram types
- No native desktop application, relies on web UI or CLI
- Advanced styling requires manual configuration
- Steep learning curve for advanced features and customization options.
- Limited support for certain diagram types and formats.
- Can be slow and resource-intensive for large and complex diagrams.
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The Verdict
AI-generated from listing dataBoth are free, open-source, self-hosted text-to-diagram tools for developers, but PlantUML offers a larger community (13,211 stars) and Java base, while D2 features modern live-browser rendering, built-in theming, and significantly more GitHub stars (24,756).
Key differences
- •D2 has 24,756 GitHub stars and is written in Go, whereas PlantUML has 13,211 stars and is written in Java.
- •D2 features instant browser rendering with live preview and built-in theming; PlantUML relies on IDE integrations like Eclipse and IntelliJ IDEA.
- •PlantUML supports EPS formats and a wide range of UML types, while D2 supports complex graph layouts like flowcharts, mind maps, and ERDs, but is limited to 2D.
- •D2 integrates natively with GitHub Actions and build scripts via CLI; PlantUML integrates specifically with Eclipse and IntelliJ IDEA.
- •D2 support uses Email and GitHub Issues, whereas PlantUML support uses Email and Documentation.
Pricing & value
Both PlantUML and D2 are completely free and open-source tools with self-hosted deployment options.
Ease of use / learning curve
Both feature simple text-based syntaxes, though PlantUML has a steep learning curve for advanced customization and D2 has a simple markdown-like syntax.
Features & depth
D2 offers instant browser rendering with live preview, built-in theming, and GitHub Actions integration.
Integrations & ecosystem
PlantUML integrates with popular IDEs like Eclipse and IntelliJ IDEA and boasts a large community with extensive documentation.
Collaboration
D2 supports self-hosted web editors for internal workflows and integrates with CI/CD pipelines and GitHub Actions.
Scalability
PlantUML can be slow and resource-intensive for large and complex diagrams, while D2's scaling limits are not specified beyond 2D limitations.
Support
Both provide Email support, with D2 offering GitHub Issues and PlantUML offering extensive documentation.
Security & privacy
Both tools are open-source and self-hosted, allowing users to host them on their own servers for data control.
Migration / lock-in
Not specified regarding data migration or proprietary lock-in for either tool.
Choose d2 if…
Developers seeking modern live browser previews, built-in theming, and seamless GitHub Actions or CI/CD integration.
Choose PlantUML if…
Developers embedded in Java ecosystems who need deep IDE integration with Eclipse or IntelliJ.
Common questions
Are both PlantUML and D2 free to use?
Yes, both PlantUML and D2 are free and open-source tools.
What are the primary programming languages for each tool?
PlantUML is written in Java, while D2 is written in Go.
How do the tools handle rendering and preview?
D2 provides instant browser rendering with a live preview that updates as you type, whereas PlantUML integrates with IDEs like Eclipse and IntelliJ IDEA and exports to PNG, SVG, and EPS.