
Last week, we announced the new Courier Toasts SDK — rebuilt for a smoother, more customizable UX and a faster, drop-in integration experience. Today, we’ll show you just how easy it is to add real-time toast notifications to your app using Courier.
The new Toasts SDK is available today. Whether you’re starting from scratch or upgrading, it’s designed to help you deliver fast, intuitive, and consistent user feedback across your app.
Choose the SDK that fits your stack:

How to Use Claude Code on Mobile to Design, Test, and Ship Multichannel Notifications
A walkthrough of using Claude Code's mobile app with Courier's MCP server and CLI to design, test, and ship a multichannel product announcement from a phone. Covers the full workflow: drafting the content outline, creating notification templates using Courier's elemental format, building channel-specific variants for email, Slack, push, and SMS, customizing brand styling through the API, iterating on design with test sends, getting team approval, and publishing with custom routing rules. The whole thing took a couple hours, mostly cold start and design iterations.

Transactional vs. product vs. marketing notifications
Transactional notifications confirm something the user did or something that happened to their account. Product notifications help users get value from features they already have. Marketing notifications sell. The consent rules differ by channel: marketing email is opt-out under CAN-SPAM, marketing texts need prior express written consent under the FCC's TCPA rules, and every push notification is gated by the operating system's notification permission.

What is the Twilio Messaging API?
Twilio's Messaging API enables developers to send and receive SMS, MMS, WhatsApp, and RCS messages at scale across 180+ countries. While Twilio excels at reliable message delivery through carrier networks, modern applications need more than single-channel messaging. Courier acts as a provider-agnostic orchestration layer that activates messaging across Twilio and other channels from a single platform. You get intelligent routing, user preference management, and fallback logic without vendor lock-in.