The best alternatives to Collaborative Testing by Supra are Microsoft Azure, Proto.io, and Stage. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Collaborative Testing by Supra?
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Stage is a browser-based editor for creating app wireframes. Visualize your ideas in minutes with ready-made blocks. Use a library of mobile patterns to kickstart ideation process. Share your project and export it to a design tool with a single click.
Appliku automagically sets up your server and runs your web apps from GitHub or GitLab. Set up in under 5 minutes, click to deploy. Think of Appliku as your personal DevOps.