UML diagram tool
UML helps a team agree on structure before anyone writes code. AnnexShow puts a UML diagram tool in the browser, so you can lay out classes, actors and relationships with drag and drop and adjust them as the design evolves. Start from a template or a blank canvas, then set colors, fonts and shapes to keep the diagram readable and on brand. Vector output stays sharp in a spec or a slide. Share a public link for review, invite teammates to refine the model, and export to PNG, JPG, SVG or PDF when the design is ready to document.
How it works
- Open a UML template or start from a blank canvas.
- Add classes, actors and components with drag and drop.
- Connect relationships and refine labels and styling.
- Share a link for review and export to PNG, SVG or PDF.
Frequently asked questions
- Is the UML diagram tool free to use?
- Yes. The free plan includes core editing and a limited number of projects, with no credit card required to start. Pro is €5.90/month or €59/year.
- What UML elements can I add?
- Place classes, actors and components, draw relationships, and arrange shapes with drag and drop.
- Can I share a diagram with my team?
- Send a public share link, or invite teammates to collaborate before you export to PNG, SVG or PDF.
At a glance: plans
| Feature | Free | Pro |
|---|---|---|
| Price | 0 € | €5.90 per month or €59 per year |
| Projects | 2 | unlimited |
| Export formats | PNG, JPG, SVG, PDF | PNG, JPG, SVG, PDF, PPTX, GIF, MP4 |
| API | no | yes |
Sources
- AnnexShow pricing (current plans and prices)
- AnnexShow API specification (OpenAPI)
- OMG: Unified Modeling Language (UML) 2.5.1