The official app is still free for any platform. There’s a “Premium” type app by Soft Pauer – that brings you all sorts of things like a live GPS map and costs some 32 USD. It goes down by the race though (as you’re enjoying less and less live data).
For what it’s worth; I’ve purchased the F1 Timing CP from Soft Pauer since 2009. Or 2010. Whichever year it was first released. It really shows you who’s where, and the ability to do that while seeing the sector times at the same time is really fantastic. But those things all have a different price for different people. I find the expense justified. Some people might not.