Jolla has released version 4.1.0 of its Sailfish OS. Kvarken has been chosen for the name of this edition, the narrow part in the middle of the Gulf of Bothnia. Sailfish can be used on Jolla C, Jolla Tablet and multiple Xperia devices. More information about this release, including installation instructions and supported models can be found on this page. These are the main changes made in this release: 3rd party API and apps.