While you are on the site, in your browser find and click "Add to Home Screen" A CGN beaver app icon will then be created to your phone that is directly link to the site.
Note: This feature may not be available in some browsers.
FWIW a levelling head is the way to go. Ball heads are fundamentally unstable, where a levelling head is fundamentally stable. I have found the 15 deg range of the levelling head is more than enough.