In this present era Anemia is global health problem, Anemia is a very big issue for present era. The World Health Organization (WHO) estimates that some two billion people are anemic. As per the medical science there is lots of way to detect the Anemia, but most of the approaches are based on Invasive approach. The problem with Invasive approach is require the physical contact with the device so, In this paper we discuss about the previous existing Invasive and non- invasive approaches which are based on nails eyes and hemoglobin based. Here we also did the comparative analysis and based on the analysis we find the previous . existing issues and based on those issues we try to find the future scope on this area. Here we also did the implementation of those previous existing approaches. Here we use the python as a language for the implementation of existing approaches. In terms of result analysis, we use two parameters which are time complexity and accuracy.