Twilio SendGrid Email API vs. Courier

SendGrid makes it simple and stress-free to communicate with your customers. Our technology and expertise helps senders save time, scale their business, and succeed in an ever-changing email landscape. We are trusted by over 80,000 customers globally - big and small - to send over 45 billion emails every month. We help developers send with confidence by providing: FAST AND FRIENDLY INTEGRATION SendGrid's optimized integration tools and standardized API were built by developers for developers to make integrating with SendGrid a breeze.

Courier is notification infrastructure for customer messaging, built for humans and AI agents. It sits between your app and every channel you send on: email, SMS, push, in-app inbox, chat, and webhooks. You send one request, and Courier works out where it goes, what it looks like, and whether the user wanted it at all. Teams use it for the messages a product has to send: onboarding, alerts, receipts, reminders, and account notices. You keep the providers you already pay for. Courier is the layer above them.