Good mobile market apps for Android include the Google Play Store, Amazon Appstore and Samsung Galaxy Apps, according to DigitalTrends.com. As of 2015, the Apple App Store is the only officially supported market app for iOS.
As of 2015, the Google Play Store is the largest Android market and is far ahead of the Amazon Appstore in this respect. However, the Amazon Appstore is easy to use and has levels of quality control that Google Play does not, according to DigitalTrends.com.
Apple does not officially allow market apps other than the Apple App Store on iOS. As a result, third-party market apps, such as Cydia, generally require jailbroken iOS devices.