A simple index of coincidence calculator
The index of coincidence is an indicator used in cryptanalysis which makes it possible to evaluate the global distribution of letters in encrypted message for a given alphabet.
In simple terms, index of coincidence is a tool for measuring how statistically "rough" a text is, i.e. how far it departs from a uniform distribution in which all letters are equally likely.
The calculation can be done in the commandline via accessing code.py. You can calculate IoCs of messages upto a sentence in here(without new lines).
A web based solution is also available by opening the index.html in your browser. This can be used to calculate IoCs of multiple sentences and texts such as poems and stuff...