If so, what other "fee-free" apps can I direct tenants to use instead of Venmo?

@Mitch Vought  check out the Meetups App. 

Will you give me your cell phone number?

Once your app is completed it is generally a waiting game.

She does not have a cell phone, so he corresponds with her via notes left on her door.

And I have clients selling $5M houses in Beverly Hills beating out the agent from Bravo's Million Dollar Listing.I like to call it the Youtube Spiral:Buy a cheap but decent lavalier mic and a little cell phone holder that makes it easier to hold your camera.

Please let me know, I also sent you a DM with my cell phone number.

1) there's a roof pitch gauge on the App Store that'll tell you your roof pitch quick and easy.2) I'm assuming that by zonal you mean a mini split or ductless system.  

No magic pill or app or code will do it.

I've also gotten his cell number to send him pictures when it's done.