Dynameter displays a measurement called PSR - the difference between the peak level and the loudness. Higher PSR readings are typically found with more dynamic recordings, whereas heavily limited or clipped material usually shows lower PSR values. Dynameter measures the PSR in realtime, and also displays a colour-coded history graph, giving you an intuitive snapshot view of the dynamic profile of your music.
Dynameter will feel very comfortable for users of the TT Meter - we've deliberately tuned the results to make sure they're as intuitive as possible. There are differences, though. The TT Meter uses plain RMS values for its "DR" readings, whereas Dynameter's PSR readings use the more sophisticated ITU loudness standard. For audio with a balanced frequency response, the results will often be similar.