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.

However, the PM recently moved to app folio. 

@Cheree HarrisI was just recommended stessa and it’s free access from app or website with same interface.

I found this one surfing around https://jerrybarker.com/calcul... but we usually just average the income out then use https://propertytracker.com which isn't designed for STRs but works fine after averaging the projected income outside of the app.  

Lay everything out in Excel or do you use an app? 

Try asking your neighbor hosts on AirBnB and check an app called Nextdoor

Their calendar view is really nice and immediately syncs with the channels.I can easily message guests from the app regardless of where they booked.

I am seeking recommendations for companies or resellers that specialize in App/Card-based Washer/Dryers.

Shiny bells and whistles but no real benefit have lost more money from this app. 

That's why I don't use any OTA other than Airbnb, nor any cleaning app other than Turno, and nor any PMS other than Guesty or Hostaway!