The best alternatives to Userbrain are Opentest, UserTesting, and Feedback Tools. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Userbrain?
AssemblyAI— Speech-to-Text API with superhuman accuracy
UserTesting is a platform for getting rapid customer feedback on almost any customer experience you can imagine, including websites, mobile apps, prototypes, and real world experiences.
Zigpoll is an embeddable polling widget that can live on any page within your website. It lets you easily collect feedback, emails, and sentiment from your visitors so you can make better business decisions.