I have often thought about making a digital character sheet. I don't have a smartphone though, and I can't program for it, so it would be for a pc/laptop, which is why I've never did it. The normal character sheet is more handy than a pc after all

However...
My thought is that it's still "just" a (hopefully friendly) game. Gold, equipment, treasure... I would let the players administrate that themselves. No need to "text the GM" in my opinion.
I imagine a small program/app that had all the equipment and spells etc included. Then the players could just click/unclick what they find/buy/sell.
An option could be to include an actual shop in the program/app. When a player buy or sell stuff their gold stash is automatically regulated.
Thing is though... It would
have to be really well made, fast and easy to use to actually beat the cards and character sheets! After all, the game isn't
that complicated

edit:
I've started playing Space Crusade by the way. Anyone familiar with that game knows how "handy" the scanners are! A big hunk of plastic that does three things: Monitors your commanders HP, your negative score (dead marines) and which marines if any have targeters. It's freaking big! Like 20 x 10 x 5 cm!!!
That thing deserve an app more than HQ!