Meet graph.tk, a great utility if you forgot your graphing calculator

Website: graph.tk.

It does nothing more and nothing less than you’d expect it to. Simply put, it graphs functions of all different kinds!

The interface is beautiful not because it has a thousand buttons, but because it is so simple and straight to the point. Here’s what you see when you load up the website:

In case you're wondering what that function in the right hand top corner is, it's a derivative.

You can add almost an infinite number of functions, and toggle their display via the colored checkboxes. And this isn’t your ordinary Cartesian coordinate grapher; it can even handle polar functions and inequalities! The controls are very intuitive: use your scroll wheel to zoom in and out, and left-click + drag to pan around. There’s even a screenshot option built-in to the page so that you can take a picture of your beautiful graph! The equations are displayed as you would expect to find them in a mathematics textbook (with LaTeX), and for you tech geeks, it’s built with HTML5 and it’s open source.

The only caveats to this otherwise awesome web app are that you can’t find points of intersection or roots of a function so easily… but that’s where your high school/college algebra skills come in!

I would give this app an overall rating of 9/10 (10/10 if only it had tools to find intersections/roots), and I highly recommend it to anyone who needs a quick graphing calculator because they’re too lazy to go downstairs and get their backpack.

For more information, visit their about page.

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