I want something that lets me plot graphs online. I've found this site http://itools.subhashbose.com/grapher/index.php but it won't let me customise the gaps on the axis

Example: X is fine, but Y is showing multiples of 47 instead of 50

wolfram alpha is a good srouce for plotting

have you tried using the docs.google spreadsheets?

I think xip might know if u wanna ask him