Flare

Put Flare on your
home screen

Takes about fifteen seconds. It opens full screen with no browser bar, and it looks and behaves exactly like an App Store app.

You're already in it This is the installed app — no browser bar, own icon. Nothing else to do.
https://flaredetroit.com/app/

What you actually get

Own icon, own nameYes
Full screen, no browser barYes
Opens instantly, works offline-ishYes
Updates itselfYes — no App Store
Costs anythingNo
Asks for your locationOnly when you tap the button