Reference

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Explore your world, find a quick fact, or dive down a Wikipedia rabbit hole with the official Wikipedia app for iOS. With more than 40 million articles across nearly 300 languages, your favorite free online encyclopedia is at your fingertips.

Learn more at our FAQ page:
https://www.mediawiki.org/wiki/Wikimedia_Apps/iOS_FAQ

App features:

Night reading - Appearance controls let you read Wikipedia in comfort, with dark mode, text size control and image dimming to customize how you read.

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Wolfram|Alpha--Get answers. Access expert knowledge. Wherever you are. Whenever you need it.

Find out how much vitamin C is in a bowl of ice cream. Learn what European country has the fourth largest population of children. Compute solutions to difficult trig and calculus problems. Balance complex chemical equations. Discover what is overhead as you gaze up at the stars. Finally crack that crossword puzzle.

Whoever you are and whatever you do, Wolfram|Alpha delivers insight and understanding into any facet of your life.

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The WordWeb English dictionary and thesaurus: fast searching, spelling suggestions, definitions, usage examples, synonyms, related words - and no adverts. An offline audio version is available separately.

The comprehensive WordWeb dictionary database includes:

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Yahoo! Search for iPhone is an all-in-one search app that connects you to the places and information you need when you’re mobile. Get fast, easy access to the best of Yahoo! – built for the iPhone.

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Yell: Your guide to local businesses such as plumbers, taxis, restaurants, and shopping. Search for local UK business information on the move, plot results on a map and view directions.