Google Play Store is the primary app store available for Android devices, however there are also many apps that aren't accessible on the platform. These apps are referred to as black market apps and they provide paid applications for free. These apps are available for download from a variety of websites and sources. Certain apps could contain viruses or malware and not all are safe to download. It is therefore crucial to only download black market apps from reputable websites.

Blackmart Alpha, a black-market application that offers a range of paid software and video games, is a good example. It's not accessible on the Google Play Store because it violates their terms of service, however you can install it by enabling downloads from unknown resources on your phone. Other apps, like Mobilism or ACMarket, are community-driven websites that allow users to exchange cracked apps. The content regulations on the Google Play Store are less strict, so you'll find pirate and adult-oriented apps.

Some of the top black market android apps allow you to test the premium app before purchasing it. This gives you an overview of the interface and features of the app. It can be frustrating to buy an app, only to regret it later. The apps let you test out new features before making a final decision upon that.