Where i can get good option payoff calculator at free of cost

i need to get payoff calculator for various price ranges.i should be able to eidt the pricess and generate the payoff calculator and the one is nest plus is not allowing me to edit the prices. i want put my own price and see all the scenorios.

For free I do not have much idea but one can make it on their own in excel.If you go through some videos on youtube one can get decent start on proceeding further.