Which are the best session replay tools that are also free?

I want to start a discussion within the G2 community on the best session replay tools to pick one. Below are the tops tools in the market. How has been your experience with these?

1. LogRocket: It combines session replay, product analytics, and error tracking.
2. SmartLook: It is an analytics solution for websites, iOS/Android apps, and various app frameworks.
3. Fullstory: It is a behavioral data and analytics platform that helps technology leaders and digital experience teams understand their digital story so they can make every interaction more human.