Mermaid Chart vs OpenCharts
| Mermaid Chart | OpenCharts | |
|---|---|---|
| Free plan | Yes | Yes |
| Free trial | Yes | No |
| Paid from | $12/mo | $9.99/mo |
| Open source | No | No |
| Platforms | api, extension, Web | api, macOS, Web, Windows |
| Free plan | Yes | Yes |
| Mermaid support | Yes | — |
| Real-time collaboration | Yes | — |
| Diagram import | Yes | — |
| Platform | web | — |
| Export formats | PNG, SVG, PDF, MMD | — |
Both are listed in Best AI Diagram Generators. On Freedom251, OpenCharts scores higher on our published basis.