Intelligent Speaker is described as 'Text to speech extension for a browser. Automatic text detection (can speak without necessary selection), adjustable voice speed, playlist' and is a Text to Speech service in the web browsers category. There are more than 50 alternatives to Intelligent Speaker for a variety of platforms, including Windows, Web-based, Mac, iPhone and Android apps. The best Intelligent Speaker alternative is Read Aloud Extension, which is both free and Open Source. Other great apps like Intelligent Speaker are Balabolka, Kokoro, NaturalReader and eSpeak.