You can use this application to connect to any LRS that uses Basic HTTP authentication. Once connected, you can inspect the stream of statements sent to the LRS by your Learning Activity Provider and verify that the statements are being reported correctly. You can also verify that activity states are being persisted to the LRS and actor/activity profiles are being stored properly.
Not sure what the Experience API is all about?
The Experience API is a brand new learning technology specification that opens up an entire world of experiences (online and offline). This API captures the activities that happen as part of a learning experience. A wide range of systems can now communicate with a simple vocabulary that captures this stream of activities.