The going rate for graphing calculator’s still isn’t cheap, making a sidestep of a purchase that much more appealing. The PI83 Graphing Calculator app ($.99, iPhone) was created to mimic the features of the standard Texas graphing calculators. Perform standard functions – tables, coordinates, notations or graphs – while using the iPhone’s touchscreen to pan or zoom in and out of your work. As a bonus, the PI83 app even comes with a built-in anti-cheating policy for exam time. A timestamp is tagged to each screenshot taken while open and close times are logged to ensure the user didn’t navigate away to look up an answer.
More on Time.com: 20 Back-to-School Gadgets
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