A lot of smartphone apps are just mobile translations of a standard computer program or website – useful, but they don’t really take advantage of the strengths of mobile platforms beyond the interface. Here’s an app that „gets“ the way people use their phones, and tricks you into expanding your vocabulary. In a good way.
GRE Vocab Lock will give your phone a secondary unlock screen, which consists of a vocabulary word and two possible synonyms.

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[New App] GRE Vocab Lock Helps You Study For The Big Test Every Time You Unlock Your Phone was written by the awesome team at Android Police.
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