I think I came across a hi-lo app or two when I was looking for one too. I never tried any of them because I don't use hi-lo. I didn't find any free ones that allow any other counting system and allow you to play. The only free-ish one I ended up using was Card Counter, but it doesn't allow for play, just displays a bunch of cards and asks you the count. I eventually got Norm's app and really like it.