Zoho ZeptoMail vs. Courier

Zoho ZeptoMail is an email service built exclusively for transactional email sending. It handles automated emails triggered by user action on a business website or application. This exclusive focus allows us to ensure great deliverability for these important emails. It comes with a feature-rich interface that helps optimize transactional email sending. ZeptoMail offers a flexible payment plan with a pay-as-you-go pricing and no monthly payments.

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.