<P> Google Play enables users to know the popularity of apps, by displaying the number of times the app has been downloaded . The download count is a color - coded badge, with special color designations for surpassing certain app download milestones, including grey for 100, 500, 1,000 and 5,000 downloads, blue for 10,000 and 50,000 downloads, green for 100,000 and 500,000 downloads, and red / orange for 1 million, 5 million, 10 million and 1 billion downloads . </P> <P> Users can submit reviews and ratings for apps and digital content distributed through Google Play, which are displayed publicly . Ratings are based on a 5 - point scale . App developers can respond to reviews using the Google Play Developer Console . </P> <P> Google has redesigned Google Play's interface on several occasions . In February 2011, Google introduced a website interface for then - named Android Market that provides access through a computer . Applications purchased are downloaded and installed on an Android device remotely, with a "My Market Account" section letting users give their devices a nickname for easy recognition . In May 2011, Google added new application lists to Android Market, including "Top Paid", "Top Free", "Editor's Choice", "Top Grossing", "Top Developers", and "Trending". In July, Google introduced an interface with a focus on featured content, more search filters, and (in the US) book sales and movie rentals . In May 2013, a redesign to the website interface matched the then - recently redesigned Android app . In July 2014, the Play Store Android app added new headers to the Books / Movies sections, a new Additional Information screen offering a list featuring the latest available app version, installed size, and content rating, and simplified the app permissions prompt into overview categories . A few days later, it got a redesign consistent with the then - new Material Design design language, and the app was again updated in October 2015 to feature new animations, divide up the content into "Apps and Games" and "Entertainment" sections, as well as added support for languages read right - to - left . In April 2016, Google announced a redesign of all the icons used for its suite of Play apps, adding a similar style and consistent look . In May 2017, Google removed the shopping bag from the Google Play icon, with only the triangle and associated colors remaining . </P> <P> Google states in its Developer Policy Center that "Google Play supports a variety of monetization strategies to benefit developers and users, including paid distribution, in - app products, subscriptions, and ad - based models", and requires developers to comply with the policies in order to "ensure the best user experience". It requires that developers charging for apps and downloads through Google Play must use Google Play's payment system . In - app purchases unlocking additional app functionality must also use the Google Play payment system, except in cases where the purchase "is solely for physical products" or "is for digital content that may be consumed outside of the app itself (e.g. songs that can be played on other music players)." Support for paid applications was introduced on February 13, 2009 for developers in the United States and the United Kingdom, with support expanded to an additional 29 countries on September 30, 2010 . The in - app billing system was originally introduced in March 2011 . All developers on Google Play are required to feature a physical address on the app's page in Google Play, a requirement established in September 2014 . </P>

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