I am currently using Requestly in development. It saves me a lot of time taking note of bugs and anomalies or improvements to UX. By recording and visualizing mouse movements and clicks, you see exactly user actions and interaction. The console log is crucial for pinpointing problems. In a component-driven application (Angular in my case) it is an indispensable tool that pays itself in few days. A real treasure. I understand that Requestly further offers more functionalities about the APIs but I still had no time to explore them.