Very cute!
This app is a wonderful way to expand your vocabulary. The way words are presented in various contexts is very effective, though some questions are sometimes hard to figure out. The dictionary, with its thousands of excerpts, is great to learn how exactly the words are used within a definite context. I would just advise non-native speakers to be wary though: the app wont propose you to learn what the authors consider ‘standard English’, so it is not the app you need if you try to learn slang (it’s rated PG, so no coarse words here) or even colloquial English. But otherwise, this is really rad.
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Vocabulary.com, v1.0.1