Every communication primitive. One API key.

One API key and one SDK for email, and soon SMS, video, scheduling and more.

import { Coss } from "coss";

const coss = new Coss({ apiKey: process.env.COSS_API_KEY });

await coss.email.send({
  from: "Acme <hello@acme.com>",
  to: "user@example.com",
  subject: "Welcome",
  html: "<p>Hi there</p>",
});
Email
Transactional email from your own domains.
SMSSoon
Text messages worldwide.
VideoSoon
Rooms and recordings.
SchedulingSoon
Bookings and availability.