Freedom251 › AI Diagram Generators
diagram.ch
What diagram.ch is
diagram.ch is a web service that turns plain-language descriptions of processes, ideas, systems, or workflows into editable diagrams. Its AI chooses a format and generates Mermaid syntax; supported formats include flowcharts, process diagrams, mind maps, sequence diagrams, and system or software architecture diagrams. Users can download results as SVG or PNG, or copy the Mermaid source code. To revise a diagram, they can change the original description and regenerate it, or edit the copied code in a compatible Mermaid editor. No account is required. The Free plan is listed as free and allows several diagrams, subject to a lightweight rate limit intended to limit abuse. Prompts and generated diagrams are processed for the request and are not intentionally stored in a product database. User text is sent securely to the AI service, though temporary infrastructure logs may be created for security and reliability. The site advises against submitting passwords, health data, financial details, or other highly sensitive information.
Who it suits
It suits people who want to turn a written description into an editable diagram and export it as an image or Mermaid code. It may also fit users who prefer not to create an account, provided they avoid entering highly sensitive information.
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.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | Several diagrams · lightweight rate limit · no account required | Free |
As diagram.ch lists them, read 8 Oct 2026. The maker's own page has the final word.
Verdict
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.
Facts from diagram.ch's own pages
- Account
- The service does not require an account. · diagram.ch, 8 Oct 2026
- Data handling
- User text is sent securely to the AI service to produce Mermaid code, and temporary infrastructure logs may be created for security and reliability. · diagram.ch, 8 Oct 2026
- Diagram types
- The MVP supports flowcharts, process diagrams, mind maps, sequence diagrams, and system or software architecture diagrams. · diagram.ch, 8 Oct 2026
- Editing
- Users can edit the original description and regenerate, or edit copied Mermaid code in a compatible Mermaid editor. · diagram.ch, 8 Oct 2026
- Exports
- Users can download diagrams as SVG or PNG, or copy the Mermaid source code. · diagram.ch, 8 Oct 2026
- Generation
- The AI selects a diagram format and creates Mermaid syntax from the user's description. · diagram.ch, 8 Oct 2026
- Prompt storage
- Prompts and generated diagrams are processed for the request and are not intentionally saved in a product database. · diagram.ch, 8 Oct 2026
- Purpose
- diagram.ch turns plain-language descriptions of processes, ideas, systems, or workflows into editable diagrams. · diagram.ch, 8 Oct 2026
- Sensitive data
- The site advises users not to enter passwords, health data, financial details, or other highly sensitive information. · diagram.ch, 8 Oct 2026
- Usage limit
- Free generation is subject to a lightweight rate limit intended to protect the service from abuse. · diagram.ch, 8 Oct 2026
Where diagram.ch stands on Freedom251
- AI Diagram Generators#16 of 32