This request was originally marked as outside the scope of dbFront. Since then, PWA (Progressive Web App) technology has advanced to the point that we can now build Web Applications that can directly act like installable apps with much of the same functionality.
This means that I can update the dbFront Web client so that it can be installed locally on a desktop or phone with the intention of progressively adding offline functionality.
NOTE: Please vote on the main feature (not this answer) or consider funding this Feature Request if it interests you.
The website is certainly enough for us. Again, the danger is trying to make dbFront all things to everyone.