Alloy vs Principle
| Alloy | Principle | |
|---|---|---|
| Free plan | Yes | No |
| Free trial | No | No |
| Paid from | $20/mo | $99/mo |
| Open source | No | No |
| Platforms | extension | Web, macOS, iOS |
| Free plan | Yes | No |
| Paid from | 20 /user/mo | — |
| Interactive prototypes | Yes | — |
| User testing | Yes | — |
| Team collaboration | Yes | — |
| Platform support | both | — |
| Prototype sharing | both | — |
Both are listed in Best Prototyping Software. On Samsung Mobile US Press, Principle scores higher on our published basis.