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D2lang vs Graphviz

D2lang and Graphviz both land on Worth it.

D2lang

d2lang.com

Worth it
Confidence: Medium

Buy if your team writes code and wants architecture diagrams that live in version control . it is free and well-regarded.

Read the full report

Graphviz

graphviz.org

Worth it
Confidence: Medium

Use it if you are a developer or docs team turning code and data into version-controlled diagrams . it is free, mature, and battle-tested.

Read the full report

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D2lang versus Graphviz
CompareD2langGraphviz
VerdictWorth itWorth it
Best forDev teams diagramming architecture in GitDocs-as-code and dev teams
Who it's not forNon-technical teams wanting drag-and-dropNon-technical teams wanting drag-and-drop flowcharts
PrivacyNo known public vulnerabilities found in the sources reviewed.⁵Mature open-source tool with periodic parser CVEs; distros patch quickly.
Support qualityNo support evidence in sourcesCommunity forums only, no vendor SLA
Public sentimentUsers on Reddit and Hacker News praise the diagram output quality while noting the DSL learning curve and the confusing D2 name.⁶Developers love it as a free, reliable diagram-from-code workhorse but grumble about layout control on complex graphs.13
Biggest gotchaNo paid tier means no vendor support . you rely on GitHub issues and community forums.⁴Third-party wrappers (WordPress plugin, NLTK integration) introduced their own XSS/RCE bugs

Pick D2lang when

  • Dev teams diagramming architecture in Git
  • Docs-as-code workflows
  • Engineers replacing PlantUML or Visio
  • Open-source self-hosters

When D2lang is not a fit

  • Non-technical teams wanting drag-and-drop
  • Anyone unwilling to learn diagram syntax
  • Buyers needing paid support SLAs
  • One-off diagrams where a whiteboard suffices

Pick Graphviz when

  • Docs-as-code and dev teams
  • Pipelines generating diagrams from data
  • Network and dependency maps
  • Devs who prefer text over drag-and-drop

When Graphviz is not a fit

  • Non-technical teams wanting drag-and-drop flowcharts
  • Anyone exploring large networks interactively
  • People needing bar, pie, or dashboard charts
  • Teams requiring vendor support SLAs

Sources

  1. D2 . GitHub repositorygithub.com
    official
  2. D2 Roadmapd2lang.com
    official
  3. D2 is non-profitd2lang.com
    official
  4. Sponsor D2d2lang.com
    official
  5. D2 product security paged2lang.com
    security
  6. Holy crap D2 diagrams are impressive . r/selfhostedreddit.com
    review
  7. D2: Declarative Diagramming . r/programmingreddit.com
    review
  8. D2 HN launch discussionnews.ycombinator.com
    review
  9. A complete guide to declarative diagramming with D2 . LogRocketblog.logrocket.com
    review
  10. Top 7 diagrams as code tools . IcePanelicepanel.medium.com
    news
  11. Graphviz official sitegraphviz.org
    official
  12. Graphviz Licensegraphviz.org
    official
  13. Graphviz Reviews . G2g2.com
    review
  14. Create diagrams with code using Graphviz . Redditreddit.com
    review
  15. Here's Why You Shouldn't Use Graphviz for DAGs . Mediummedium.com
    review
  16. Graphviz forum . child nodes interweavedforum.graphviz.org
    review