Pick symbols — for the person you send them to, they gather from thousands of particles and fade. By link or QR code, no app.
Print the QR code on a card or a box. You can seal it until a set time — it opens right then.
No. Everything opens in the browser, including inside Telegram and WhatsApp.
Yes, for personal messages.
Anyone who has the link. You can delete a message from “Mine” at any time.