Built an App for me and my Dad

Me and my dad got some Cold Wallets but he was sad he couldn’t see how it performs without giving away his private keys or paying subscriptions.

So I built an app that he could, just with the address, see when he bought and how it performed over time. Just like in an exchange.

It finally got approved and I would love to have some Feedback from you guys. Any Cold wallets users here?

BTC Mate , I hope links are allowed