Is this app for TNT subscribers only? – The News Tribune News Review

I've been using this app on and off since it came out. Sometimes it lets me read articles. Sometimes it denies access and requests a subscriber login. The app isn't consistent. Some days I can access all of the articles. Some days I can't access any. If full access required a subscriber login, please be clear about that.
Review by Longtime TNT Reader on The News Tribune News.