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A comment on Ask HN: Does this exist?.
http://bots.duolingo.com/
If they had an API (which, they do not), somebody could build a TTS + voice recognition wrapper for this functionality, creating the experience you mentioned.
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http://bots.duolingo.com/
If they had an API (which, they do not), somebody could build a TTS + voice recognition wrapper for this functionality, creating the experience you mentioned.