Hi Mary,If you haven't found a solution yet, I am currently building an app that has a maintenance tracking feature and maintenance reminders are next in the pipeline. 

Does anyone know of a free mobile app that i can use to scan receipts, until i can generate funds to  purchase quick books?

You can avoid the firmware issue by taking your phone in close proximity to the lock (a few inches or less) and use the app to check for any firmware updates.

Our tenants report maintenance issues through the tenant portal or resident connect app in Rentec Direct. 

I’ll try to figure out how to DM you my cell. 

I'm just looking for a good app that can help me record receipts and expenses, help me management income. 

Quote from @Robert Leitner: I have a couple properties and use Stessa as my property management app but they don’t yet have maintenance and issue tracking.

Quote from @Purva Raichura: You’re right: serious developers don’t replace pre-app meetings, civils, or title services with software.

Some common names you'll see thrown around a lot: Stessa, Apartments.com, RentRedi, TenantCloud, Innago, RentManager, Avail, Rentec Direct, Doorloop, etc.I recommend you search for each of those apps online and see what they offer, how much they charge, etc.

I have them conditionally formatted so the dates turn increasing red as we approach the date in the cell.