I created CurlHub as a replacement for the original Runscope traffic inspector, which I loved, but is no longer available.
The biggest difference between the CurlHub and Runscope traffic inspectors, is that CurlHub saves the requests to your browser's localstorage, where Runscope saved them in one of their databases.
This means for CurlHub to log your requests, your browser has to be open.
The decision was made to use localstorage, due to GDPR. Storing random API response data, was not something I wanted to deal with.