Freedom251 › AI Diagram Generators
AutoUML
What AutoUML is
AutoUML is a web tool that turns plain-English descriptions into editable UML diagrams without requiring an account. It generates Class, ER, Sequence, Use Case, and Activity diagrams; users can then drag, resize, rename, and reconnect elements. Diagrams can be exported as PNG or PDF without watermarks for use in documents, slides, Notion, or Confluence. Users can also paste PlantUML code for in-browser rendering, and that offline parser does not consume AI generation quota. The free plan costs nothing and includes a set of AI generations, with no account or credit card required. For more generations, users can bring a Gemini, OpenAI, or Grok API key. AutoUML says it adds no markup to those providers’ charges and keeps keys in browser local storage rather than its servers. Unlimited generations, diagram history, share links, and a priority AI model are listed as coming soon. The service is provided as-is, and generated diagrams may need review for accuracy and suitability.
Who it suits
AutoUML is aimed at university students, engineering teams, and solo developers who need UML diagrams from descriptions or PlantUML code. Its exports may help people placing diagrams in documents, slides, Notion, or Confluence.
What it does well
- No sign-up or credit card required.
- Generates five listed UML diagram types.
- Exports PNG and PDF without watermarks.
- PlantUML rendering does not use AI generation quota.
- Supports Gemini, OpenAI, and Grok API keys.
What to know first
- Free plan includes only a set of AI generations.
- Several premium features are listed as coming soon.
- Generated diagrams may need review for accuracy and suitability.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | A set of free AI generations · no account or credit card required · bring your own Gemini, OpenAI, or Grok API key for more generations | Free |
As autouml.com lists them, read 8 Oct 2026. The maker's own page has the final word.
Verdict
AutoUML provides a free way to create and adjust several UML diagram types in a browser. Review generated results for accuracy, and note that unlimited generations and other listed premium features are not yet available.
Facts from AutoUML's own pages
- AI providers
- The bring-your-own-key feature supports Gemini, OpenAI, and Grok; AutoUML says it adds no markup to provider charges. · autouml.com, 8 Oct 2026
- API key storage
- AutoUML says a user's API key is stored only in browser local storage and never touches its servers. · autouml.com, 8 Oct 2026
- Diagram types
- It generates Class, ER, Sequence, Use Case, and Activity diagrams. · autouml.com, 8 Oct 2026
- Editing
- Users can drag, resize, rename, and reconnect diagram elements. · autouml.com, 8 Oct 2026
- Exports
- Diagrams can be exported as PNG or PDF without watermarks. · autouml.com, 8 Oct 2026
- Integrations
- The site describes exporting diagrams for use in docs, slides, Notion, and Confluence. · autouml.com, 8 Oct 2026
- Intended users
- The site presents AutoUML for university students, engineering teams, and solo developers. · autouml.com, 8 Oct 2026
- PlantUML
- Users can paste PlantUML code for in-browser rendering, and the site says this offline parser does not use AI generation quota. · autouml.com, 8 Oct 2026
- Premium features
- Unlimited generations, diagram history, share links, and a priority AI model are listed as coming soon. · autouml.com, 8 Oct 2026
- Service caveat
- The terms say the service is provided as-is and generated diagrams may require review for accuracy and suitability. · autouml.com, 8 Oct 2026
- Support
- AutoUML lists [email protected] for contact and says it aims to respond within 24 hours. · autouml.com, 8 Oct 2026
- What it does
- AutoUML generates UML diagrams from plain-English descriptions, with no sign-up required. · autouml.com, 8 Oct 2026
Where AutoUML stands on Freedom251
- AI Diagram Generators#12 of 32