Wolfram|Alpha for iOS is now available for free. To enter a custom query, you had to buy the full app. The app was limited, however, to queries executed through Siri and queries made using one of the example queries. Previously available was a free version called Wolfram|Alpha Viewer, which could be used to run queries. Until now, users had to buy the app to use it. Users are able to ask questions on a variety of topics, from solving homework equations to determining the airspeed velocity of an unladen swallow. Since then, it has been an indispensable tool for students, teachers and pro users around the world, often ranking among the top 10 reference apps in the App Store ®. Wolfram|Alpha for iOS first launched in 2010.
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