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Re:Ask HN: Apps you'd pay $1/month by ratfacemcgee on Sunday March 20, 2016 @07:55PM (#11325301)
Hellotalk. It was free, but there was an option where you could pay $1 a month for unlimited translation (i think they'd only give you 10 translations a month normally).

Very helpful if you're in a conversation with someone and they've asked you a question which you can't answer without translating something.