Knock is a product and customer messaging infrastructure. You can use Knock to power all of your product's messaging needs, including transactional messaging, lifecycle marketing, one-time announcements, and in-product messaging, without the effort of building and maintaining your own in-house messaging system.
Knock is made with engineering, product, growth, and operations teams in mind. It's easy for developers to implement, and simple for less-technical users to maintain in our dashboard.
Knock launches
Launch date
Knock agent for SlackBuild, manage, and ship customer messaging from Slack
Launched on June 2nd, 2026
Knock data sourcesTrigger event-based messaging from Stripe, Clerk, Supabase
Launched on April 10th, 2026
