OK so they want you to pay for that app. OK no big deal its a dollar. Then you are blind sided later when you have to pay a subscription fee. Wow. Ill just use FireShifts. Its completely free and handles what I need. I hope the developer of the app isnt a firefighter. And if it is... Shame on your brother. Greed has blinded you.
Houston fire 02 about Spark - Shift Calendar, v2.3.2