Orange NMR has been updated, with more accurate 4J HH couplings prediction and improvements to the peaks table.

Orange NMR is an App to predict 13C and 1H NMR spectra: draw a structure to see its spectrum. The accuracy of the algorithm is about 1.9 ppm for 13C and 0.21 ppm for 1H (RMSD=3.4 and 0.31 ppm correspondingly).

There are an increasing number of spectroscopy application available for mobile devices.