What are some alternatives?
When comparing userinput.io and UserTest.io, you can also consider the following products
Usability Testing Exchange - Free usability testing of, and feedback about, your website/app.
UserTesting.com - Usability testing has never been easier. Get videos of real people speaking their thoughts as they use websites, mobile apps, prototypes and more!
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.
Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.
UsabilityTools - Where UX meets Conversion. Unlock the Potential Behind Remote Research and Testing
UXTesting - Discover how your mobile users feel