Ask Rovo, Claude or ChatGPT to explain a system and you get a Mermaid or PlantUML diagram. Paste it into Confluence and the trouble starts: a small image you cannot zoom, a white box in dark mode, a render server that is down, and a PDF export that shows raw code where the picture should be.
It bites at the worst moment. The architecture review. The audit handover. The PDF a customer asked for.
Four things make diagram-as-code work in Confluence, whatever tool you pick:
- Render as SVG, not a fixed PNG, so it stays sharp at any width.
- Give big diagrams a zoom view. Sequence and ER diagrams outgrow a page column fast.
- Keep the diagram text with the diagram, so the next person can edit it rather than hunt for an exported image nobody can change.
- Test one export before the review, not during it.
Disclosure: I am the author. We built Crisp Diagrams at Katabarwa Labs around those four points after reading the critical reviews of every diagram app on the Marketplace. It renders Mermaid, PlantUML, D2, DBML and Excalidraw as SVG that fits the page, opens a full-screen pan and zoom view, follows Confluence dark mode, and imports mermaid.live and plantuml.com links. PlantUML runs in your browser, so no render server can take your diagrams down with it. Save a diagram in the editor and it is attached as an image, so PDF and Word exports show the picture instead of the source. It is free: no paid tier, no diagram limit, no account to create, and no trial that expires. Treat it as one option among whatever you evaluate.
Crisp Diagrams on the Atlassian Marketplace:
https://marketplace.atlassian.com/apps/3911881842/crisp-diagrams-mermaid-plantuml-excalidraw-for-confluence
Which diagram language do you use most in Confluence? Tell us and we will add starter templates for it.
