AutoUML vs Diagrams.so
AutoUML
autouml.com
Diagrams.so
diagrams.soSide by side
| Figure | AutoUML | Diagrams.so |
|---|---|---|
| Price from | Free | $10/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | — | Yes |
| Plans published | 1 | 3 |
| Spec score · AI Diagram Generators | 7.6 (#22) | 8.2 (#11) |
| Diagram types | It generates Class, ER, Sequence, Use Case, and Activity diagrams. | It generates flowcharts, sequence diagrams, ERDs and cloud infrastructure diagrams. |
| Integrations | The site describes exporting diagrams for use in docs, slides, Notion, and Confluence. | The product offers a REST API, MCP server, and Python and TypeScript SDKs, and names Claude, Cursor and VS Code as MCP clients. |
| Intended users | The site presents AutoUML for university students, engineering teams, and solo developers. | The maker describes the product as purpose-built for cloud architects, DevOps engineers and technical teams. |
| Support | AutoUML lists [email protected] for contact and says it aims to respond within 24 hours. | The Power plan includes priority support, and the About page lists [email protected] for questions, feedback and partnership inquiries. |
| What it does | AutoUML generates UML diagrams from plain-English descriptions, with no sign-up required. | Diagrams.so turns natural-language descriptions into editable architecture diagrams in native Draw.io format. |
Plans
In their own words
Diagrams.so
Diagrams.so turns written descriptions into editable architecture diagrams, saved in Draw.io format. It generates flowcharts, sequence diagrams, entity relationship diagrams and cloud infrastructure diagrams, with official AWS, Azure, Google Cloud Platform and Kubernetes icon libraries alongside network, database, security and general-purpose shapes. Opinionated Mode can suggest missing components; non-blocking warnings flag risks such as single-AZ deployments and publicly exposed resources. Diagrams export as.drawio XML, PNG or SVG, and.drawio files open in Draw.io, Confluence, VS Code and Notion. Users can import.drawio files on every plan and compare or restore versions using history. The product offers a REST API, MCP server, and Python and TypeScript SDKs, with Claude, Cursor and VS Code listed as MCP clients. Free includes five credits, requires a BYO LLM key and watermarks exports. Free-tier diagrams are public; private diagrams require Pro or Power. Pro costs $10 a year billed annually or $15/mo billed monthly; Power costs $16.67 a year billed annually or $25/mo billed monthly.