Yes! Our mobile app allows you to download individual courses for offline use. To do this, go into the course you'd like to download, and click the download icon in the upper right-hand corner. From there, you can then tap the "offline courses" button on the main courses page to view the courses you've downloaded.
You can have a maximum of six courses downloaded to your device at any given time, and they'll remain available to you until you either delete them from your device, or your subscription expires.
Additionally, there's a few courses including, "Mathematical Fundamentals" and "Algorithm Fundamentals" that have been built using a brand new system of creating courses that's not yet compatible with our offline features. As such, they don't have download buttons like the rest of the courses just yet, but we're expecting to have this changed sometime in mid-august. We appreciate your patience while we make these updates!