Knock

Knock is a developer-first, AI-native notification infrastructure designed for cross-channel messaging. It provides a single API for sending notifications across various channels, including in-app, email, SMS, Slack, and push. The platform also includes tooling for managing complex workflow logic. It offers comprehensive notification infrastructure for product and engineering teams, enabling orchestration of multi-channel workflows. Knock supports features like preference management and observability, and allows users to build, edit, and ship messaging with AI agents, managing product, marketing, and transactional communications.