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App: Google Translate 

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OS: Android, iOS

Features: The app works like a real-time translator between two people speaking different languages. The users need to open the app and press the microphone button. If speech in foreign language is detected, it will be immediately translated into the user's native language, spoken aloud and displayed on screen. The user can then press the microphone button to respond in the native tongue and have it immediately translated to the foreign language. Once a complete cycle is understood by the app, it will recognize both the languages as they are spoken and will translate them as soon as a phrase is uttered. 

Pros/Cons: The Google Translate app also has a Word Lens function using which user can focus the device's camera on any foreign text and get an instant translation on-screen. Number of languages that can be understood by Word Lens is limited but work is going on to expand the feature to more languages. 

Rating: 4.5/5

App: Voice to Voice Real time Interpreter

OS: iOS

Features: Users need to select a language using the flags and start speaking straight away. The app recognises the language and speaks out in the other language. The app offers 21 different languages to choose from and will show the interpreted speech as text too.

Pros/Cons: The Voice to Voice app is fast and speaks out the translation in a clear and pleasant voice. However, it requires an internet connection to run. Friendly user interface is an added plus.

Rating: 4.5/5 

App: iTranslate Voice

OS: Android, iOS

Features: With this application, what we say translates into another language, all voice to voice. It translates into many languages, currently supporting 42 languages and dialects. It comes with option of adding punctuation marks by speaking them out. For common words and phrases, iTranslate will show you additional meanings and definitions.

Pros/Cons: One can easily access the most-frequently used phrases. A great tool for doctors, policemen and travelers, who need to ask similar questions in many languages. The basic app is free for Android devices while the premium Android version and the one for Apple devices is paid. Users get to choose from 90 languages.

Rating: 4/5

App: Speak and Translate

OS: iOS

Features: This app offers a wide range of languages for translation: 100 for text-to-text, 41 for text-to-speech and 42 for voice-to-voice. Handoff feature lets the users continue with the session without any interruption. Using this feature, one can switch from iPhone to iPad or vice-versa seamlessly. The history of one's translations is synchronized across all the Apple devices. 

Pros/Cons: The app provides easy sharing option and iCloud integration too.

Rating: 4.5/5

App: Talk Translate

OS: Android

Features:  Talk Translate application provides real-time translation on the internet-enabled state of the device. One can save/share/move the result of the translation. 

Pros/Cons: Commonly-used phrases can be added to this application

Rating: 4/5