This looks great. I've been using fooplot.com but Desmos is much more polished, so will consider switching.

Initial things I like:

- Latex representation

- Ability to save expressions

- Pretty UI

Initial issues:

- Keyboard shortcuts. I cannot jump to start/end of line.

- Copy/paste. I get something like this when copying an expression: "\sqrt{\left(x\right)}"

All in all: great job!