Which to prefer for finding Tempo: Tempogram or Beatroot plugin?

[Apfelmatsch]

If I want to know in what tempo several parts of a piece of music are played, what should I use.

In the musicologist's guide to Sonic Visualizer they speak of either tapping by ones own or using Spectrograms. I suppose they are talking about the "Chronogram" feature in Mazurka Plugin, which is not supported on Macs, right?