AutoUML
AutoUML: A free web tool for generating, editing, importing, and exporting five UML diagram types. Ranked #24 of 32 in AI Diagram Generators by our editors (7.0/10); pricing: Free plan; best for free UML diagram generation.
At a glance
- Editor score7.0 / 10
- PricingFree plan
- Best forFree UML diagram generation
- Free planYes
- Paid fromFree
- Facts checked20 Sep 2026
Where it wins
- Generates five UML diagram types from natural-language descriptions
- Imports PlantUML scripts and supports interactive canvas editing
- Exports to PNG or PDF without requiring an account
Where it doesn't
- Access is limited to the web platform
- Exports are limited to PNG and PDF formats
- Its focus is UML rather than a broader diagram catalog
Our verdict on AutoUML
AutoUML is a web-based AI diagram generator for students, solo developers, and engineering teams. It turns natural-language descriptions into class, entity relationship, sequence, use case, and activity diagrams. The Free plan includes AI UML diagram generation, PlantUML import, interactive editing, PNG and PDF export, and access without an account or credit card. Users can generate diagrams through AutoUML’s free allowance or connect their own API key from Gemini, OpenAI, or Grok.
The main strength is its focused workflow from description to editable diagram. A user can begin with plain English, refine the result on the interactive canvas, or import and render an existing PlantUML script. That combination suits people who want AI assistance without giving up a script-based workflow. Support for five specific UML types keeps the product aligned with software design and documentation rather than general-purpose visual diagramming.
Pricing is straightforward because the available plan is Free, with no account required to start. Bring-your-own API key support adds compatibility with Google Gemini, OpenAI, and xAI Grok, while the service remains web-only and provides PNG and PDF exports. AutoUML is a strong fit for lightweight UML creation, classroom work, technical planning, and individual documentation. Teams seeking broader diagram coverage, additional export formats, or a wider platform footprint should choose a tool designed around those needs instead.
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AutoUML pricing
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AutoUML fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| AI diagram limit | Not verified |
| Mermaid support | Not verified |
| Real-time collaboration | Not verified |
| Diagram import | Yes |
| Platform | Web |
| Export formats | PNG, PDF |
| Deployment | Cloud |
| Platforms | Web |
| Support | Email, Docs |
| Built for | Solo, Small business, Mid-market (editorial estimate) |
| Integrations | 3 integrations: Google Gemini, OpenAI, xAI Grok |
| Pricing | Free plan (source) |
| Website | autouml.com |
| Facts checked | 20 Sep 2026 |
AutoUML integrations
AutoUML lists 3 integrations on its own site.
- Google Gemini
- OpenAI
- xAI Grok
Alternatives to AutoUML
- OpenFlowKitA flexible free diagramming workspace for technical teams that prefer editable, portable outputs.9.4
- EraserA broad diagram workspace combining AI, diagram-as-code, collaboration, and integrations.9.3
- ArchwayA broad architecture diagram generator with AI input, collaboration, APIs, and self-hosting.9.2
See all AutoUML alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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