Principle vs ProtoPie
Principle
principleformac.com
ProtoPie
protopie.ioSide by side
| Figure | Principle | ProtoPie |
|---|---|---|
| Price from | — | $25/mo |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | Yes | Yes |
| iOS | Yes | Yes |
| Android | — | Yes |
| API | — | Yes |
| Self-hosted | — | Yes |
| Plans published | 0 | 4 |
| Spec score · Interface Design Tools | 5.7 (#26) | 8.7 (#8) |
Plans
In their own words
Principle
Principle has no write-up on Specifiction yet; its figures are above.
ProtoPie
ProtoPie is a high-fidelity platform for creating and testing interactive digital prototypes. Studio for macOS and Windows supports logic, variables, formulas, multi-touch gestures, text input, media playback, voice, camera access, and device sensors such as gyroscopes and compasses. Plugins import designs from Figma, Sketch, and Adobe XD. Prototypes can connect phones, tablets, TVs, and wearables, with interactions synchronized across devices. The product ecosystem includes Studio, Player for mobile devices, Cloud for sharing, and Connect for connected experiences. Player is available for iOS, iPadOS, Android, and HarmonyOS. The Free plan includes two prototypes saved in Cloud, up to eight scenes per prototype, and 50MB of Cloud storage. ProtoPie lists Basic at $25 a month billed yearly, and Pro at $47 a month billed yearly. Free-plan limitations include no local file saving, share links, Handoff, or Team Libraries. Prototypes export only as.pie files, not PDF, JPEG, or HTML code.