The app is useful for the researchers who need help in plotting the HRV chart and to know the frequency and time domain values while developing the device that gives the HRV signals through Bluetooth via UUID as mentioned in the app. The charting is neat with display of number of signal readings received per second so that you know how many signals were sent and how many are received by the app. The graph / plot / chart tells you about the signal signature and you can thus optimise your hardware. The chart gives you Stress level, NN50, SDNN, RMSSD, lf/hf ratio and many more parameters. It also give the probability of diseases analysed from the data