4. Amazon Fire OS

The next best OS is from Amazon. Fire OS is now applied for tablet (Kindle Fire), TV (Fire TV), and smartphone (Fire Phone). The Amazon OS was developed based on Android OS. Everything on this OS is aimed at the services of the company like prime Video or Kindle. Among three products of Amazon, Fire TV is the most successful device. It is the tough competitor of the other TVs in the market, while Fire Phone is the failure at the beginning.

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