UMLGen
UMLGen: A fast, free way to generate and edit several UML diagram types in a browser. Ranked #22 of 26 in UML Modeling Software by our editors (6.8/10); pricing: Free plan; best for fast AI-generated UML diagrams.
At a glance
- Editor score6.8 / 10
- PricingFree plan
- Best forFast AI-generated UML diagrams
- Free planYes
- Paid fromFree
- UML diagram typesUse Case, Class, Sequence, Activity, Deployment, ER, EER
- Facts checked22 Sep 2026
Where it wins
- Generates seven diagram types from plain-English descriptions
- Free forever with no login or installation required
- Edits diagrams through descriptions and exports PNG images
Where it doesn't
- No verified code generation or reverse engineering
- No repositories or collaboration features
- Web-only access depends on a browser
Our verdict on UMLGen
UMLGen is a free, browser-based UML diagram generator for software developers, students, academics, and software architects. Users describe a system in plain English, and its AI parses the description to identify relationships and generate Use Case, Class, Sequence, Activity, Deployment, ER, or EER diagrams. It also includes a design-from-scratch editor, supports diagram changes through description edits, and exports diagrams as PNG images. The product runs in desktop, tablet, and mobile browsers, with no account or installation required.
The published Free plan costs 0 and is free forever. It includes text-to-diagram generation, a design-from-scratch editor, PNG export, and no-login access. That makes UMLGen a straightforward option for users who want to move from a system description to a visual model without committing to software installation or account setup. The broad diagram coverage is useful for early system design, classroom work, documentation drafts, and architecture discussions where PNG output is sufficient.
UMLGen is focused on fast diagram creation rather than a broader modeling repository or development workflow. The available product details do not include verified code generation, reverse engineering, repositories, or collaboration features, so teams needing shared model management or a connection between diagrams and source code should choose an alternative. UMLGen fits individuals and small working sessions that value quick, plain-English generation and simple editing. It is less suitable for organizations seeking a collaborative, code-connected UML environment or deeper lifecycle management.
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UMLGen fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| UML diagram types | Use Case, Class, Sequence, Activity, Deployment, ER, EER |
| Code generation | Not verified |
| Reverse engineering | Not verified |
| Team collaboration | Not verified |
| Deployment | Web |
| Supported platforms | Web browser; desktop, tablet, and mobile browsers |
| Model repository | Not verified |
| Deployment | Cloud |
| Platforms | Web |
| Support | Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan (source) |
| Website | umlgen.com |
| Facts checked | 22 Sep 2026 |
Alternatives to UMLGen
- IBM Engineering RhapsodyA broad engineering suite for teams connecting models, code, requirements, and verification.9.3
- Sparx Enterprise ArchitectA broad enterprise modeling suite with deep repositories, engineering and versioning features.8.9
- IBM Rational Software Architect DesignerA broad enterprise modeling platform for teams that need traceability and transformation workflows.8.9
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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