In 2010 Google took steps towards separating its Chrome browser and the way its apps operated. Unlike traditional web-based applications, the software didn’t have URLs or navigation buttons, making it feel more like native desktop programs. This new breed of Chrome apps were also capable of working offline, connecting with peripherals and delivering desktop notifications.
Continuing to advance its vision for Chrome software, Google recently announced the depreciation of legacy packaged apps. This means that the new legacy packaged apps can no longer be published in the Chrome Store. Mountain View also advised that these types of apps will be removed from the Chrome Web Store’s search and browse functions in December of this year, and that they will completely lose support in June of 2015.
To maintain their applications, Google is encouraging developers to migrate their legacy packaged software to either modern Chrome apps or extensions. To make things a bit easier, the company offers a migration tutorial to help devs making the switch.