I work on a remote team, and whenever someone had a birthday or was leaving, the "card" was usually a link to a doc that half of us never saw. It always felt a bit sad to me, like the thought was there but the thing itself wasn't. So I started building something on evenings and weekends, and this is it.
You say who the card's for, or upload a photo of them, and it makes a cover and a first message. Then you send one link around, everyone adds a note from their phone (no accounts, which I was stubborn about), and the person gets something that actually opens like a card.
It's free, and it's just me working on it, so I'd really like to hear what's missing, or what would put you off using it for your own team's next card.