Diagrams & Visualization · head-to-head
drawio vs mermaid-diagrams
Pick mermaid-diagrams when the diagram should live inside a Markdown file, review in a pull request, and change with the code around it. Pick drawio when someone will need to rearrange the diagram by hand — it emits native .drawio XML that opens in an editor, plus PNG, SVG and PDF export. The question is not which draws better; it is whether the artefact should be text in a repo or a file in an editor.
Pick drawio
The diagram is a deliverable someone non-technical will open, adjust, and re-export — or it needs a layout no text syntax can express.
Pick mermaid-diagrams
The diagram documents code, belongs in the repo, and should diff in a pull request like any other line of text.
Side by side
How they differ
| drawio | mermaid-diagrams | |
|---|---|---|
| Output artefact | Native .drawio XML, plus PNG / SVG / PDF export | Mermaid text, rendered where Mermaid is supported |
| Editable by hand afterwards | Yes — opens in the draw.io editor | Only by editing the text |
| Lives in the repo | As a separate file | Inline in Markdown — diffs in review |
| Layout control | Full, plus optional ELK auto-layout | Whatever the Mermaid renderer decides |
| Diagram types | Flowchart, ER, sequence, class, network, wireframe, mockup | Flowchart, sequence, class, state, ER, and more |
| Publisher | draw.io (JGraph) — vendor-official | Community |
| Extra tooling | Optional draw.io Desktop CLI for conversion and export | None |
Output artefact
- drawio
- Native .drawio XML, plus PNG / SVG / PDF export
- mermaid-diagrams
- Mermaid text, rendered where Mermaid is supported
Editable by hand afterwards
- drawio
- Yes — opens in the draw.io editor
- mermaid-diagrams
- Only by editing the text
Lives in the repo
- drawio
- As a separate file
- mermaid-diagrams
- Inline in Markdown — diffs in review
Layout control
- drawio
- Full, plus optional ELK auto-layout
- mermaid-diagrams
- Whatever the Mermaid renderer decides
Diagram types
- drawio
- Flowchart, ER, sequence, class, network, wireframe, mockup
- mermaid-diagrams
- Flowchart, sequence, class, state, ER, and more
Publisher
- drawio
- draw.io (JGraph) — vendor-official
- mermaid-diagrams
- Community
Extra tooling
- drawio
- Optional draw.io Desktop CLI for conversion and export
- mermaid-diagrams
- None
Open drawio or mermaid-diagrams for the composite score, license, and exact install commands, or browse the full Diagrams & Visualization category.
Verdict
The bottom line
For documentation that lives with code, Mermaid wins on the property that matters: it is text, so it reviews and diffs and never goes stale in a way nobody notices. For anything that leaves the repo — an architecture diagram in a deck, a wireframe a designer will adjust — drawio wins, because a diagram nobody can edit is a screenshot. A useful default is Mermaid inside the repo and drawio for anything with an audience outside it.
FAQ
Common questions
Should I use draw.io or Mermaid with an AI agent?
Mermaid if the diagram belongs next to the code and should diff in review. draw.io if a human will rearrange it later or you need PNG, SVG or PDF export. drawio can also convert Mermaid to an editable .drawio file, so starting in text and promoting later is a valid path.
Does the drawio skill need the draw.io app installed?
No. Without it, the skill still emits .drawio XML or an app.diagrams.net URL. With a local draw.io Desktop CLI present it adds Mermaid conversion, ELK auto-layout, and PNG/SVG/PDF export.
Is there an official Mermaid skill?
Not from the Mermaid project — it publishes no agent skill of its own. The Mermaid entries catalogued here are community-published, which is why draw.io is the only vendor-official diagramming skill in this category.
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