I overall think this a very valuable resource as a teaching tool because it helps with visualization which can be so important for graphing. Additionally, students can add multiple coordinates and graphs and see how different variables interact.
I think this is a great teaching tool its super intuitive to use and makes seeing equations and graphs very simple. The user interface is easy to follow and there is no guess work, you put in your equation and you get you graph and it simply does what it needs to and doesn't make it difficult.