Graph Paper Press might be a bit more popular than Useberry. We know about 1 link to it since March 2021 and only 1 link to Useberry. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I've been looking at the variety of UT sites available for remote usability testing (useberry.com, maze.co, userzoom.com, UserTesting, userbrain.com, TryMyUI, userlytics.com, uxarmy, UXcam). Source: over 2 years ago
There is https://graphpaperpress.com/ I haven't used them for a while but they have good cred. Source: about 2 years ago
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