Side by side
AutoUML vs diagram.ch
Both stand on ai diagram generators. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Web
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.
Visit AutoUML
Free plan Web
diagram.ch offers a direct route from a description to an editable Mermaid diagram, with image and source-code exports. Keep the rate limit and data-handling cautions in mind when choosing it.
Visit diagram.chThe facts
| AutoUML | diagram.ch | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Web | Web |
| Lowest paid plan | Free or on request | Free or on request |
| Plans published | 1 | 1 |
| Maker | Not published | Not published |
| Website | autouml.com | diagram.ch |
| On ai diagram generators | #12 of 32 | #16 of 32 |
AutoUML: 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.
diagram.ch: what it does well
- Supports five diagram categories, including mind maps.
- Generates Mermaid syntax from plain-language descriptions.
- Exports diagrams as SVG or PNG.
- No account is required.
- Can revise through prompts or compatible Mermaid editors.
What to know first
- Free generation has a lightweight rate limit.
- The site advises against entering highly sensitive information.
- Temporary infrastructure logs may be created.
Alternatives to AutoUML Alternatives to diagram.ch The whole list