toa (Theory of Acutes) is a mobile application of the Homoeopathy book ‘Theory of Acutes' by Dr Prafull Vijayakar M. D. (Hom). Dr. Vijayakar is a well known classical Hahnnemannian Homoeopath practicing in Mumbai, India for the last 35 years. He has started the Predictive school of Homoeopathy to promote right homoeopathy as given by Hahnnemann.