Right now, the app experience is only available on smartphones, specifically iOS with an Android counterpart in development. There is the potential to bring this information onto the web, however this is not in our immediate development plans.
For the time being, you can get the best experience by using Pryme Vessyl with an iOS smartphone. We'll report when the Android version is available to download. Pryme Vessyl will require an active connection with your smartphone to function effectively.