I'am using the BiggerPockets calculator, an app on my phone and I just googled random calculator to cross check my numbers and I'm getting 3 different calculations.

The most convenient part is having different phone numbers for various entities that can all run through the Voice app.

Also, this appears on the ABNB app...Interestingly, none of these 3 charged a pet fee. 

Is it accurate in terms of finding people's cell phone numbers?

I am not one of those.I do personal communications with all the guests and they have my cell so they can call or text.

We take it a step further and even attach the owners email and cell phone number.

Every system you try will have flaws, or you may salivate over a feature that appears in other software.Some familiar names are mentioned frequently: Stessa, Apartments.com, RentRedi, TenantCloud, Innago, RentManager, Avail, Rentec Direct, Doorloop, etc.I recommend conducting thorough research on each app online to understand their offerings, pricing, etc.

We've found that most, if not all, websites, apps, or widgets will charge some fee for accepting credit card payments. 

There is a 0.0% chance I'm switching to their credit card pitching app.

I feel like I spend a lot of time just weeding through bad tenant apps and fake docs.