
Cross-channel notifications and customer messaging through one API
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Knock is notification and customer engagement infrastructure for developers and AI agents. It sends messages across email, SMS, push, chat and in-app channels from a single API. Teams can build journeys with an AI-assisted, single-prompt workflow, segment users with dynamic attributes and add in-app messaging with custom components. It also unifies data across a warehouse and a customer data platform, and keeps version control with rollbacks for changes to messaging. The listing says Knock delivers hundreds of millions of messages each month with 99.99% uptime.
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