Pretty good but...
The voice/text-to-speech is incredible, (alot) better than most consumer/pay probrams for the PC. The app allows you to input whatever you want and it will speak it back with either an English or polish pronunciation. Because of this, the app is well worth the money simply for its tts capabilities. The translations are lacking though. For some reasons some words/phrases are not translated at all. Other than this glitch the translations are just about up to par with any online translator, but what more can you expect. It will translate some idiomatic phrases which is pretty nice. Overall I would say its a buy!
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iSpeak Polish