iPhone/Windows Phone: You have a lot of options for calculators on your phone, but Photomath does things differently. Just point your phone's camera at an equation, and PhotoMath automatically comes up with the solution.
Once PhotoMath reads an equation, it gives you the answer alongside a step by step guide to how it came up with the solution. It can take in arithmetic, fractions, powers and roots, and simple linear equations. In our tests, it worked incredibly well, and it's surprisingly snappy with its response. An Android version is in the works for early 2015.