We used the gamechanger in HS and it worked out well. They recently upgraded the app, but I haven't used the update yet. The GC app and stats are free to the Admin/Scorekeeper, but fans/parents have to pay per season to view the live gamestream and see the team and player stats. If you have a lot of interest it's probably cheaper to pay for everyone in Advance, about $240 for the season.
Also, you will need an Internet connection for the live streaming, so you will probably need a portable MyFi type device and additional service from your phone company, not sure of the cost there.
Don't know how the iscore works or what it costs, but the GC is pretty good but not free other than the app.
Ladies, if a man tells you he will fix it, he will fix it. There is no reason to remind him about it every six months.