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.
Excalidraw is a free, open-source collaborative whiteboard tool that allows users to create and share diagrams, flowcharts, and other visual content in real-time. It is designed to be simple, intuitive, and highly customizable, making it a popular choice for teams and individuals looking for a flexible and collaborative drawing tool.
- Zero cost, fully free
- Self‑hosted for full data control
- Simple, readable syntax reduces learning curve
- Integrates easily with CI pipelines and GitHub
- Highly customizable and flexible
- Real-time collaboration features
- Simple and intuitive interface
- Free and open-source
- Limited to 2D diagram types
- No native desktop application, relies on web UI or CLI
- Advanced styling requires manual configuration
- Limited features compared to paid alternatives
- Can be slow with large diagrams
- Limited support options
More alternatives & similar tools
Alternatives to d2
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The Verdict
AI-generated from listing datad2 is ideal for developers needing scriptable, version‑controlled diagrams integrated into CI pipelines, while Excalidraw excels for real‑time collaborative sketching.
Key differences
- •d2 uses a markdown‑like text syntax; Excalidraw relies on a drag‑and‑drop visual UI.
- •d2 can be self‑hosted for full data control; Excalidraw is primarily cloud/SaaS.
- •Excalidraw offers real‑time multi‑user collaboration; d2 does not.
- •d2 integrates directly with CI/CD and GitHub Actions; Excalidraw’s integrations are limited to Slack and GitHub linking.
- •d2 focuses on 2D technical diagrams; Excalidraw supports free‑form whiteboarding and brainstorming.
Pricing & value
Both are free, but d2’s self‑hosting eliminates any hidden SaaS costs, offering pure zero‑cost deployment.
Ease of use / learning curve
Excalidraw’s intuitive drag‑and‑drop UI is easier for non‑technical users than d2’s text‑based syntax.
Features & depth
d2 provides scriptable diagram generation, CLI, theming, and CI integration, which Excalidraw lacks.
Integrations & ecosystem
d2 integrates with GitHub Actions and CI pipelines; Excalidraw only lists Slack and GitHub linking.
Collaboration
Excalidraw supports real‑time multi‑user editing and commenting; d2 has no native collaboration features.
Scalability
Self‑hosted d2 can be scaled with internal infrastructure; Excalidraw depends on its cloud service.
Support
Both offer email and GitHub Issues as support channels; no premium support listed for either.
Choose d2 if…
Developers needing automated, version‑controlled diagrams in codebases or CI pipelines.
Choose Excalidraw if…
Teams that require live, collaborative whiteboarding for brainstorming and informal diagramming.
Common questions
Can I host the tool on my own servers?
Yes for d2 (self‑hosted); Excalidraw is primarily cloud/SaaS.
Does the tool support real‑time multi‑user editing?
Only Excalidraw provides real‑time collaboration; d2 does not.
Is there any cost for advanced features or enterprise support?
Both are free with no paid tiers; support is limited to email and GitHub Issues.