Moles are one of the most common human skin condition and melanoma is a malignant skin cancer that can raise from moles. The recognition of any alteration in shape, color and size can be useful for prevention of melanoma. We present an informative and easy to use application that can help general people, physicians and health care professionals to learn the ABCD rule, a well-known mnemonic rule that can help to differentiate the melanoma from the benign mole.