
The Free Dictionary
8.0#3 in online dictionaries$9.99 one-timeFree planAndroidiOSWebAPI
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It suits readers who want a broad reference library with vocabulary tools, translation lookup, and offline English dictionary access. It may also suit developers seeking API access, though the listing directs them to contact Farlex for instructions.
WordWeb suits people who want an English reference tool for definitions, synonyms, examples or translations, including offline lookup. Pro may suit users who need advanced search, custom glossaries or optional dictionaries.