Archway vs OnUML
Archway
archdiagram.devOnUML
onuml.comSide by side
| Figure | Archway | OnUML |
|---|---|---|
| Price from | $12/mo | $8/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 5 | 5 |
| Spec score · AI Diagram Generators | 8.5 (#7) | 7.7 (#20) |
| Support | Pro includes priority support, Team Pro includes a priority support SLA, and Enterprise includes dedicated support. | The site lists [email protected] as its contact email. |
Plans
Archway
- FREEFree
- PRO$12 a month
- TEAM$35 a month
- TEAM_PRO$40 a month
- ENTERPRISEPriced on request
OnUML
- FreeFree
- Starter$4.90, paid once
- Pro$8 a month
- Popular$9.90, paid once
- Pro Pack$19.90, paid once
In their own words
OnUML
OnUML is a web-based AI diagram generator and UML editor for Mermaid, PlantUML, Draw.io and mind maps. It creates diagrams from natural-language prompts and supported image inputs, then supports visual or code editing with a real-time preview. A one-click repair tool addresses Mermaid and PlantUML syntax errors. Users can save multiple code versions, restore earlier content and organize diagrams by project. PNG and SVG export and shareable links are supported. Its remote MCP server connects with coding agents including Codex, Claude Code, Cursor and OpenClaw. MCP follows workspace permissions and can read or update Mermaid, PlantUML and OnUML mind maps; Draw.io is excluded. It checks for newer edits before updates and stops if an overwrite would occur. The Free plan costs nothing, billed forever, with two diagrams per project, ten cloud projects per workspace, two workspaces and ten free model requests daily. Paid choices include 4.90 USD and 9.90 USD one-time plans, a 19.90 USD one-time Pro Pack and Pro at $8 a month.