AI Diagram Maker
7.2#4 in ai diagram generatorsFrom $10 a monthFree planWebAPIExtension
VisitAI Diagram Maker vs OnUML
What both publish
| Fact | AI Diagram Maker | OnUML |
|---|---|---|
| Credit limits | Each credit represents 1,000 tokens, credits reset monthly on the billing-cycle date, and users who run out currently must wait for the reset. | Purchased AI credits expire 6 months after issuance and do not unlock diagram, project, or workspace capacity. |
| Integrations | The MCP server works with Cursor, Claude Desktop, Claude Code, and other MCP-compatible clients. | Its remote MCP server connects to coding agents including Codex, Claude Code, Cursor, and OpenClaw. |
| MCP access | The MCP server uses API keys from an AI Diagram Maker account, which users can rotate or revoke in settings. | The MCP server follows the signed-in account’s workspace permissions and supports reading and updating Mermaid, PlantUML, and OnUML mind maps; Draw.io is not supported through MCP. |
| Product | AI Diagram Maker creates software architecture and flow diagrams through a conversational interface. | OnUML is an AI diagram generator and online UML editor for Mermaid, PlantUML, Draw.io, and mind maps. |
AI Diagram Maker plans
- BasicFree
- Plus$10 a month
- Max$20 a month
OnUML plans
- FreeFree
- Starter$4.90, paid once
- Pro$8 a month
- Popular$9.90, paid once
- Pro Pack$19.90, paid once
Pick AI Diagram Maker if…
It is aimed at developers who want to visualize software architecture and workflows within development workflows. The range of import sources and MCP integrations may suit users who work with those inputs or clients.
Pick OnUML if…
OnUML suits people who want to create or edit supported diagrams in a browser, including through code or AI prompts. Its MCP server may also suit users of the listed coding agents who want diagram access within workspace permissions.