I like that Mockoon is open source and free, so I don't need to sign up for an account and re-login many times. The app is not overloaded and seems pretty responsive, so it doesn't slow down my work. It's fast and doesn't have the annoying logouts and lags that I experienced with other tools. Review collected by and hosted on G2.com.

Maybe small parts of UI can be improved, like better tooltips. Maybe improving documentation may help too Review collected by and hosted on G2.com.