OnUML vs OpenCharts
| OnUML | OpenCharts | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | No |
| Paid from | — | $9.99/mo |
| Open source | No | No |
| Platforms | Web | api, macOS, Web, Windows |
| Free plan | Yes | Yes |
| Mermaid support | Yes | — |
| Platform | web | — |
| Export formats | PNG, SVG | — |
Both are listed in Best AI Diagram Generators. On The Geeks Club, OpenCharts scores higher on our published basis.