OpenPencil vs Proto.io
| OpenPencil | Proto.io | |
|---|---|---|
| Free plan | No | Yes |
| Free trial | No | Yes |
| Paid from | — | $29/mo |
| Open source | No | No |
| Platforms | Web, Windows, macOS, Linux, iOS, Android | Android, iOS, Web |
| Free plan | Yes | Yes |
| Real-time collaboration | Yes | — |
| Prototype capabilities | none | — |
| Design systems | Yes | Yes |
| Developer handoff | No | — |
| UI animation support | No | — |
| Primary platform | web_desktop | — |
Both are listed in Best Game UI Design Software. On Samsung Mobile US Press, Proto.io scores higher on our published basis.