Welcome to oriont's newton fractal!
I test it using a GTX 970, and this program definitely gets the fan running. That means if you have a worse graphics card than mine, proceed with caution!
Using it is simple:
My math parser and differentiator are rushed pieces of garbage, so they only work with certain formats.
I probably haven't gotten all the (general) things that you can and can't do, so if you accidentally input an unrecognized equation and either the parser or the differentiator has an error, it will highlight the box in red and not do anything.
If this happens, just put in a different equation.
If the entire site crashes, just reload and don't use that equation, I guess.