[phenixbb] app which can calculate the number of reflections for a given unit cell, spacegroup, resolution?

[Georg Mlynek]

Dear Scientific community, I am looking for an app which can calculate 
the number of reflections for a given unit cell, spacegroup, resolution.

Preferred would be a graphical output too. The program XRayView 
http://www.phillipslab.org/downloads

comes very close what I imagine but it is not possible to select a 
spacegroup.

It would like to use it for teaching parts of practical part during 
lockdown.

Many thanks, br Georg.