Is paper old-fashioned now?
Not at all โ the pendulum never swung that far. What changed is that paper lost its monopoly, not its place. For formal occasions it remains the language of respect. The genuinely old-fashioned move is announcing by card, then updating by contradiction when plans shift.
Can I send paper and a link to the same event?
Yes, and it is the best arrangement for multi-generation lists. The trick is one page underneath both: the card and the message point at the same place, so a reply is a reply and the guest list stays the single count.
If guests get both, do they reply twice?
Only if the card invites one reply route and the message invites another. Print the link on the card, and the paper guest and the chat guest both tap the same button once. If someone does answer twice, the list makes duplicates obvious enough to tidy.
Do QR codes on printed cards actually work?
For guests who scan anything, yes โ one camera tap opens the page. For the ones who will not, the link printed as text waits there, and every family has a designated scanner. The card should still carry the essentials on its own face.
Which is cheaper overall?
Card stock, printing, envelopes and stamps climb quickly with a large list; a page costs nothing to send however far it travels. But cost should not decide this โ the register should. Where the occasion wants paper, pay for paper and let the page handle the answering.