Just wondering if anyone uses the beer tools program. I am looking into getting it but wasn't sure if it works in multiple divides or just the one you buy it on.
I think most applications like this are one user license on one device. I don't use Beer Tools Pro, I use BeerSmith 2.0, and I had to buy it on my phone and on my computer.
I bought BTP a few years ago for my mac and now I use the open-source BrewTarget off of a flash drive. I can't speak for BeerSmith, but I didn't find anything in BTP that isn't also in BrewTarget, for a much better price (free).
To your Q: you will have to buy a site licence for every device.