I was thinking it might be useful to have some sort of app for this.

Hold your phone over a fiat illusion to see its true value denominated in satoshi's.

The app would be called Reality.

I think most bitcoiners are still stuck in a fiat mindset (not using satoshi's as a unit of account), embracing Reality would help.

.......It would help TheWildHustle

He walks into 7/11 to buy a couple of bananas and begins performing mathematical calculations in his head.