I am beta testing kiosker. It is a nice app but does lack some of the nice HA features that Fully Kiosk possesses.
The most important feature for me is to remotely address the tablet and change screens. I use this a lot with my Fully Kiosk and windows based touchscreens. So I can switch screens based on events and timing - for example put up a sleep screen when the house goes to bed.
They have indicated that they plan to add this capability - through a cloud service. I did suggest to them to look into implementing this both through cloud and local. I understand cloud is probably good for their professional kiosk customers and probably provides ongoing revenue opportunities. But for HA this is overkill when you want to tell a tablet in your home to load a different Sharptools screen.
Incidentally I also use Dakboard - only for their slideshow capability. I pay for their service so I can set up multiple slide shows and enclose them in Sharptools dashboards. This is on the wish list - Google Photos integration - but seems not to be at the top of everyone’s list!