What systems or apps used to keep budgets/expenses in order?

[Imelda Mendoza]

Me and my husband are on our 3rd rental property and find that we need more organization in our budgets/expenses besides an excel sheet.  I'm the one that's more organized and want to make it simple for my partner to create budgets of projected then actual remodels.  With both of us running full time jobs while starting our rental portfolio, i'm looking for something that can keep us organized.  Should i use google sheets - its something he can update and i have immediate access to the update or what systems do you find that are easy to manage for someone starting off? 

Also, once home is rented any apps or systems you recommend for self managed properties?

All advice is greatly appreciated and thanks in advance.