Both Isochronic tones and Binaural beats are powerful in releasing stress & anxiety symptoms. The difference between the two is in the sampling used.
Binaural beats require a headphone as each beat (pulse) is played differently to each ear. The combined effect creates a brainwave entrainment environment that induces a sense of calm and a feeling of release from stress & anxiety.
In comparison, Isochronic tones use a single tone manually engineered into a holistic brainwave pattern. The result is a more powerful mind-body experience that does not require a headphone.
Source
Isochronic Tones, Binaural Beats & Brainwave Entrainment - Powerful MP3 Downloads