Wolfram|Alpha – Best App for Finding Answers

When Wolfram|Alpha described its software as "the ultimate tool for schoolwork and research," they weren't kidding. Simply type a query, and Wolfram|Alpha's computational knowledge engine will generate the answer using data from outside sources. The software began as a resource for math and physics students, but it has now expanded to include chemistry, biology, engineering, economics, and statistics.

The student edition of the Pro version explains how it arrived at the answer, making it ideal for learning how to tackle difficult issues. It also comes with the Wolfram Problem Generator, which provides an endless supply of automatically graded practice questions and worksheets.

Website: www.wolframalpha.com

Price of Full Version: $4.75 per month (billed annually)
Devices & Extensions: Android, iOS, Kindle Fire, Web-based