OnUML
6.6#18 in ai diagram generatorsFrom $8 a monthFree planWebAPI
VisitOnUML vs OpenCharts
OpenCharts
8.2#8 in ai presentation makersFrom $9.99 a monthFree planWebAPImacOSWindows
VisitWhat both publish
| Fact | OnUML | OpenCharts |
|---|---|---|
| Integrations | Its remote MCP server connects to coding agents including Codex, Claude Code, Cursor, and OpenClaw. | Listed connectors include Stripe, HubSpot, Slack, Google Sheets, Discord, Airtable, Calendly, Apollo, Typeform, Monday, Gmail, Notion, GitHub, Linear, and others. |
OnUML plans
- FreeFree
- Starter$4.90, paid once
- Pro$8 a month
- Popular$9.90, paid once
- Pro Pack$19.90, paid once
OpenCharts plans
- Free ForeverFree
- Starter$9.99 a month
- Pro$24.99 a month
- Teams$14.99 a month
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.
Pick OpenCharts if…
OpenCharts suits people who want AI-assisted tools for visual planning, presentations, notes, code, and automated agents. Its stated focus on healthcare, insurance, and regulated industries may appeal to teams in those fields.