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Desmos

Desmos is the most popular and most powerful graphing calculator on the web. Their calculator is also scriptable!

Desmos docs

TypeScript​

I have authored types for Desmos that you can use:

npm install --save-dev @types/desmos

Selecting the zoom level​

Here's how to get the calculator initialized to a good viewport for your scene. First zoom/pan to your desired viewport, then run the following in the Developer Console:

var { mathCoordinates } = calculator.graphpaperBounds;
copy({
  bottom: mathCoordinates.bottom,
  left: mathCoordinates.left,
  right: mathCoordinates.right,
  top: mathCoordinates.top,
});

(This assumes you have calculator as a global variable). Paste these values into a call to GraphingCalculator.setMathBounds, like so:

calculator.setMathBounds({
  bottom: -0.7973141530854024,
  left: -1.8302562099415733,
  right: 3.129546539934864,
  top: 2.055297545454642,
});