Productive Work (https://productivework.startuplist.pro/) allows you to focus on your work and track your tasks. Make best use of your time with 25 minute sessions dedicated to work and 5 minute breaks in between. Productive Work uses blockstack for authentication and gaia for secure encrypted storage.
The Blockstack Network stores application data using a storage system called Gaia. Transactional metadata is stored on the Blockstack blockchain and user application data is stored in Gaia storage. Storing data off of the blockchain ensures that Blockstack applications can provide users with high performance and high availability for data reads and writes without introducing central trust parties. With gaia storage user is in control of their own data.