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Use app() to send a URL as an app card. On iMessage, the card renders as an iMessage mini app: recipients tap it to open the link directly inside Messages, with no browser. It’s delivered through the Spectrum Mini App, Photon’s Apple-approved mini-app launcher. On Slack, Telegram, WhatsApp, and terminal, it falls back to the plain URL. 
import { app } from "spectrum-ts";

await space.send(app("https://example.com/deep-link"));
Use app() when you want to present a link as a tappable card rather than an inline URL.

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iMessage App

On iMessage, app cards open inside the Spectrum Mini App, a mini-app launcher approved by Apple. Recipients download it once on first use (they can download it directly inside the Messages app); after that, every app card you send opens directly in Messages without leaving the conversation. The launcher keeps a library of every mini app a recipient has opened, so they can reopen those apps later or share them with friends. For customized iMessage app with layout control, see Mini-app cards.