Proto.io
Proto.io: A feature-rich prototyping tool with extensive sharing controls but no concurrent editing. Ranked #16 of 37 in UI Design Tools by our editors (7.8/10); pricing: Free plan · 15-day trial; best for teams needing many sharing controls.
At a glance
- Editor score7.8 / 10
- PricingFree plan · 15-day trial
- Best forTeams needing many sharing controls
- Free planYes
- Paid from$29/mo
- Facts checked21 Sep 2026
Where it wins
- Variables, reusable components, and design-system support
- Multiple preview modes, including offline mobile preview
- Detailed sharing links, comments, threads, and user-testing links
Where it doesn't
- Concurrent editing is unavailable
- The product is web-based rather than a desktop app
- Plan limits vary by users and active projects
Our verdict on Proto.io
Proto.io is a web-based UI prototyping platform for UX designers, product managers, entrepreneurs, marketers, students, and product teams. Its drag-and-drop editor supports interface construction with component libraries and templates, while interactive links, gestures, events, animations, variables, and reusable containers support more detailed prototype behavior. Projects can be previewed on the web or through iOS and Android Player apps.
Sharing is a notable strength. Proto.io supports public, password-protected, reviewer, snapshot, and live share links, along with comments, discussion threads, and user-testing links. Teams can export prototypes and UI assets to PDF, PNG, HTML, and other formats, and connect workflows with Figma, Sketch, Adobe XD, Adobe Photoshop, Jira, Confluence, Trello, Google Fonts, and Adobe Fonts. Offline mobile preview adds flexibility when reviewing prototypes away from a browser.
The free plan and 15-day free trial provide entry points for evaluation. Paid plans are organized by team size and project capacity: Freelancer includes 1 user and 5 active projects; Startup includes 2 users and 10 active projects; Agency includes 5 users and 15 active projects; and Corporate includes 10 users and 30 active projects. Each plan includes unlimited reviewers. Proto.io is a strong fit for teams that need sophisticated interactions and controlled sharing, but teams requiring concurrent editing should choose a tool that supports real-time collaboration.
Your product? Our editors can test Proto.io in depth and publish a review, labelled as paid · from $149/mo →
Proto.io pricing
All 6 Proto.io plans and prices →
Proto.io fact sheet
| Free plan | Yes |
|---|---|
| Paid from | $29/mo |
| Real-time collaboration | Not verified |
| Interactive prototyping | Yes |
| Design systems | Yes |
| Developer handoff | Not verified |
| Variables or design tokens | Yes |
| Desktop app | No |
| Prototype sharing | Yes |
| Free trial | 15 days · no card needed |
| Deployment | Cloud, Mobile |
| Platforms | Web, iOS, Android |
| Compliance & security | ISO 27001, GDPR, SSO/SAML |
| Support | Live chat, Tickets, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 9 integrations: Sketch, Figma, Adobe XD, Adobe Photoshop, Google Fonts, Adobe Fonts … |
| Pricing | Free plan · 15-day trial (source) |
| Website | proto.io |
| Facts checked | 21 Sep 2026 |
Proto.io integrations
Proto.io lists 9 integrations on its own site.
- Sketch
- Figma
- Adobe XD
- Adobe Photoshop
- Google Fonts
- Adobe Fonts
- Jira
- Confluence
- Trello
Alternatives to Proto.io
- PenpotA broad, collaborative UI design platform with cloud and self-hosted deployment.9.4
- MockplusA broad UI design suite with cross-platform access and a low-cost annual Pro tier.9.2
- Wondershare MockittA broad UI design suite for teams working across web, desktop, and shared workspaces.9.1
See all Proto.io alternatives →
Also Ranked In
Proto.io is ranked in 8 of our directories; the 6 strongest besides UI Design Tools.
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Proto.io is listed in our UI Design Tools directory. Add the badge to your site — it links back to this page.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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