Free Confluence Diagram Plugin: Mermaid, Excalidraw & Graphviz
Need diagram tools for Confluence without paying for a large team? NGPILOT's three diagramming apps — Mermaid Plus, Excalidraw Plus, and Graphviz Charts — are all free for up to 10 users. This guide compares them so you can pick the right free diagram plugin for your Confluence.
Free diagram plugins for Confluence compared
| Feature | Mermaid Plus | Excalidraw Plus | Graphviz Charts |
|---|---|---|---|
| Free tier | Up to 10 users | Up to 10 users | Up to 10 users |
| Input method | Text / code | Visual canvas (drag & drop) | Text / DOT language |
| Diagram types | 26+ types | Freeform drawing | Directed/undirected graphs |
| Best for | Flowcharts, sequence, Gantt, class diagrams | Whiteboarding, wireframes, brainstorming | Network topologies, dependency trees |
| Live preview | Yes | Yes | Yes |
| Templates | Built-in library | 220+ shape packs | DOT snippets |
Mermaid Plus — free flowcharts, sequence & Gantt charts
Mermaid Plus for Confluence lets you write diagram code and renders it instantly. It supports 26+ diagram types including flowcharts, sequence diagrams, class diagrams, ER diagrams, Gantt charts, pie charts, mindmaps, and timelines.
Why it's great for free use:
- Text-based diagrams are fast to create and easy to maintain
- 26+ diagram types cover most documentation needs
- One-click templates get you started immediately
- Diagrams are versionable alongside your documentation
Read the full guide: Does Confluence support Mermaid?.
Excalidraw Plus — free whiteboarding & drawing
Excalidraw plus Whiteboards for Confluence provides a visual canvas with drag-and-drop shapes, freeform drawing, and 220+ shape libraries. It's like having a digital whiteboard in every Confluence page.
Why it's great for free use:
- Visual editor — no syntax to learn
- 220+ shape packs (AWS, Azure, UML, networking, wireframes)
- Perfect for brainstorming and quick sketches
- Also available for Jira: Excalidraw for Jira
Graphviz Charts — free network & dependency graphs
Graphviz Charts for Confluence uses the DOT language to generate directed and undirected graphs with automatic layout. It excels at complex node-and-edge diagrams.
Why it's great for free use:
- Automatic layout — no manual positioning needed
- Perfect for network topologies and dependency trees
- DOT language is simple and expressive
- Great for documenting infrastructure
Which free diagram plugin should you install?
- Need flowcharts and process diagrams? → Mermaid Plus
- Need whiteboarding and freeform drawing? → Excalidraw Plus
- Need network graphs and dependency trees? → Graphviz Charts
- Need all of the above? → Install all three — each is free for up to 10 users
All three apps are available on the Atlassian Marketplace with free trials.
Get started
Install free diagram plugins for Confluence: Browse all NGPILOT apps →