Knock is infrastructure for sending product and customer messaging. Ship cross-channel product notifications and lifecycle messaging that drives engagement, growth, and retention. Knock has everything you need to power notifications for your product, including: - A powerful workflow engine to automate and manage your entire cross-channel motion, from in-product messaging to email and push notifications. - Branded, in-product messaging components, including embeddable inboxes, feeds, and lifecycle messages. - Broadcasts make it easy to send effective, one-time messages to custom audiences. - A dynamic template manager for consistent, personalized cross-channel messaging. - End-to-end observability and analytics to monitor platform health and engagement. - Notification preferences give users control of where and when they receive notifications to increase retention. - Powerful integrations with dozens of tools across email, SMS, push, and chat.