Hi , I last went to SW last year and as far as I could tell last night, i couldn't see that much had changed since then. I did notice on here that Muller have reformulated the muller lights and they aren't all free now, but I think the ones that are syns are only very low.
I'm not sure about an app but I am sure I have seen a few threads on here about one, I didn't pay much attention I'm afraid as I don't have an Iphone anyway. I'm sure if you do a search you should find the threads though.