Courier

Courier is the fastest way to design your notifications once and deliver them through push notifications, direct messages like Slack and Facebook Messenger, SMS, and email–with a single Courier API rather than having to integrate each provider API separately.
Courier's Notification Designer empowers every team member to build beautiful notifications.
Drag & drop content without writing code
Consistent rendering across every email client
Re-use content for any channel
Consistent branding across all your notifications
Route each message to the most effective notification channel using a robust delivery rules engine without touching your code.