The problem with sats card is there isn't a huge ecosystem around it, only nunchuck and Linux command lines
I wonder what happens if the website goes down
Ps I own one
Discussion
what website are you referring to?
When you scan/tap the sats card to see the balance and add funds
I think it's a coinkite site not sure haven't done it in a while
The cktap balance command calls a web service to get UTXO and show current Bitcoin balance. Thats a convenience command. If the site did not exist you can unseal the private leu and sweep the funds using other apps like Sparrow.
Similar for nunchuk. Its interacting with the card but not required