Warpcast

Warpcast is the best "first" app to get people into crypto.

Looks and feels like something they already know with the added benefit of being able to tip them free money once they're on.

Find myself onboarding someone new basically every day now.

Onchain is the new online - FID 206 -  cooprecords.xyz

I don't know. I might disagree. 
Only for one reason: people here are too good, kind, and responsive compared to everything else you will find in the crypto scene. 
Going from here as a first experience to any other interaction is quite a letdown, however, the opposite is quite a nice and welcome surprise.