Swetrix - Ultimate open-source analytics to satisfy all your needs.

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!

Google Analytics - Improve your website to increase conversions, improve the user experience, and make more money using Google Analytics. Measure, understand and quantify engagement on your site with customized and in-depth reports.

Userbrain - Easy, fast, and affordable user testing for websites and prototypes.

Simple Analytics - The privacy-first Google Analytics alternative located in Europe.

userinput.io - Get on-demand feedback for your app, website or idea. Learn how to improve by hearing real opinions.