Polar as a Personal Knowledge Repository

Polar is a Personal Knowledge Repository (PKR) designed to maintain an external repository of everything critical to your education. If you want to load a text book into Polar for work and maintain the knowledge long term you should be able to do that as well. Firebase allows us to support basic cloud sync for the initial cloud functionality but for Polar 2.0 and 3.0 it will enable us to allow people to actively collaborate around documents.

Source: getpolarized.io