Knock

What is Knock?

Knock is an open-source notification infrastructure platform designed for developers who need to implement multi-channel messaging within their applications. It provides the foundational tools to build, manage, and send notifications across various channels including email, SMS, push notifications, and in-app messages. The platform is built for product teams, marketers, and developers who want to streamline customer engagement without building notification systems from scratch. Knock handles the infrastructure complexity, allowing teams to focus on messaging strategy and user experience rather than underlying delivery mechanisms. Key capabilities include data activation to inform messaging decisions, cross-channel notification orchestration, and integration with existing product ecosystems. The platform supports both transactional notifications (password resets, order confirmations) and marketing communications, making it suitable for diverse use cases across customer engagement. Being open-source, Knock allows developers to self-host, customize, and extend the notification system according to their specific requirements. This approach appeals to teams seeking transparency, control, and the ability to modify the codebase. The platform reduces development time for implementing reliable notification delivery while providing the infrastructure needed to scale customer communication as products grow.