umlet/umlet

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1603 stars · 317 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

UMLet is a free, open-source UML diagramming tool with a simple interface for quickly drawing UML diagrams using text-based element editing. It runs as a stand-alone Java application on Windows, macOS, and Linux, as an Eclipse plugin, a VS Code extension, and a browser-based web app called UMLetino.

Use cases

• draw UML diagrams quickly
• create sequence and activity diagrams from plain text
• export UML diagrams to pdf, svg, jpg, eps, or clipboard
• sketch UML diagrams without heavyweight modeling tools
• create custom UML elements and palettes
• diagram UML in the browser
• add UML diagramming to Eclipse or VS Code

When to choose

• you need fast, lightweight UML sketching rather than full round-trip modeling
• you prefer editing diagram elements via text/markup instead of pop-up dialogs
• you need a free cross-platform UML tool or a browser-based option
• you want to export diagrams to common formats like pdf and svg

When to avoid

• you need full UML 2.x compliance, code generation, or reverse engineering
• you need collaborative or versioned modeling in a team modeling suite
• you require non-UML diagram types like BPMN or network diagrams

Facets

application · maturity active

gui editor documentation graphics developer-tools documentation desktop-applications web-development cross-platform windows editor-plugin jvm uml diagramming uml-editor eclipse-plugin vscode-extension web-app umlletino sketching macos linux web-server

Member repositories

For agents

markdown · JSON · MCP: product_card(name="umlet/umlet")