Based on our record, Usability Testing Exchange seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on Reddit, HackerNews and some other platforms. They can help you identify which product is more popular and what people think of it.
You could also try a user testing site to see if there are obvious problems in the sign up flow you are missing. You can pay for one like usertesting.com or you can trade tests with https://usability.testing.exchange. - Source: Reddit / 6 months ago
UserTest.io - User testing made simple. High-quality, affordable user testing solutions from real users, here in the UK. Improve your usability!
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Userbrain - You want to improve the usability of your website? See how real people use your website for the first time, find out what works, and what needs to be improved.
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Teston - Teston is an easy, fast and localized user-testing service.