So I'm at my local bay-area park (California) where all the cool droners fly attending a drone 'meetup' coordinated/hosted by a group that never actually shows up (well, not the 2 times I went).  Anyway, other members of the meetup group still showed and, for obvious reasons, had legitimate drone questions, one of which was 'How do you know where you can fly?', to which I answered 'I use an app like b4ufly' which prompted scoffs from other 'cooler' droners nearby.  'That stuff sucks' was their best reply, which made me wonder, what do other people use?  I have checked the no-fly map built into DJI Go4 before, as well as the knowbeforeyoufly.org airspace map, but the different sources list different things differently.  What does everybody else use, if anything?

I like using Airmap. They have very up to date data on what is going on in the area you want to fly. It also provides all the phone numbers you should call to notify about your flight.

Use UAV Forcast

Yup, b4ufly is pretty awful, I also use Airmap and UAV Forecast. When planning for visits I use the online DJI map: http://www.dji.com/flysafe/geo-map

Wow, am I glad I asked that.  Both UAV Forcast and Airmap are better than b4ufly.  Thank you all.
I wish, still, the various municipalities could agree on a standard method of reporting their particular no-fly-zones to a single authority, i dunno, maybe the FAA... for instance, East Bay Regional Parks (again, California) have banned drones, but they (the park no-fly-zones) don't show up on any of the apps/sites I've checked... Had a nice knowledgeable citizen not warned me, I might have been cited by an officer of the law.  Somebody needs to create a one-stop-shop... Oh well, live and learn.