Principle vs Proto.io
Principle
principle.app
Proto.io
proto.ioSide by side
| Figure | Principle | Proto.io |
|---|---|---|
| Price from | $99/mo | $29/mo |
| Free plan | — | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| macOS | Yes | — |
| iOS | Yes | Yes |
| Android | — | Yes |
| Self-hosted | Yes | — |
| Plans published | 4 | 7 |
| Spec score · Prototyping tools | 7.9 (#17) | 8.6 (#11) |
| Spec score · Web Design Software | 7.9 (#26) | 8.3 (#15) |
| Spec score · UI design tools | 7.8 (#26) | 8.2 (#18) |
| Spec score · Prototyping Software | 7.9 (#22) | 8.3 (#15) |
| Spec score · UI/UX Design Tools | 7.9 (#20) | 8.2 (#16) |
| Spec score · Ui Ux Designing Software | 7.9 (#17) | 8.3 (#10) |
| Spec score · Game UI Design Software | 7.8 (#26) | 8.2 (#16) |
| Free plan | No | Yes |
Plans
Principle
- Principle license$129 a month
- License renewal$99 a month
- License renewal$99, paid once
- Principle license$129, paid once
Proto.io
- Free planPrice not published
- Freelancer$29 a month
- Startup$49 a month
- Agency$99 a month
- Corporate$199 a month
- EnterprisePrice not published
- Free AccountFree
In their own words
Proto.io
Proto.io is a web-based, no-code tool for building interactive prototypes for iOS, Android, and web. It includes native iOS and Android apps, more than 250 UI components that mimic native behavior, and over 1,000 customizable templates. Its library lists more than 6,000 icons, stock images, and sound effects. Prototypes can use over 80 events and over 40 actions, including nested and multidirectional scrolling, as well as 18 built-in screen transitions. Users can share links and snapshots or export to PDF, PNG, and HTML. The free plan is limited to one user, one active project, five prototype screens, and 10 MB of storage; it allows single-click sharing but no additional reviewers. A 15-day trial is listed. Freelancer costs $29 a month, billed monthly; annual billing is listed at $24 per month. Other listed monthly plans are Startup at $49.00 USD, Agency at $99.00 USD, and Corporate at $199.00 USD. Enterprise pricing is tailored. Paid plans include 256-bit SSL encryption.