What they say: “Get user insights into your digital tomorrow, today. UserZoom makes user research a standard practice in the design process, empowering businesses with the UX Insights they need through our research software and services."
Its capabilities include usability testing, interviews, surveys, live intercept, click testing, tree testing, card sorting, and participant recruiting.
Visit https://www.userzoom.com/ for more details and for setting up an account.
To get feedback on your Proto.io project, go to Share (either in the Editor or in the Dashboard under More > Manage Share links), create a new Share link (shared with everyone, not password protected), go to the ‘User Testing’ tab and copy the generated link to use in UserZoom.
You can then go to UserZoom and create your test using the above prototype URL.