Knock
Customer engagement infrastructure
Knock is a customer engagement platform for building, running, and improving product, marketing, and transactional messaging across email, SMS, mobile push, chat, and in-app channels from one place. Teams design notification workflows, broadcasts, and in-app guides, then trigger them from product events, API calls, or audience segment changes, addressing the need to coordinate multi-channel messaging without maintaining separate tools for each channel.
Core modules include Workflows, Guides, Broadcasts, and Agents, alongside template management, preferences, observability and analytics, and infrastructure as code. Data can be ingested from warehouses, CDPs, reverse ETL, and webhooks, with dynamic segments built from attributes, events, and relations. AI agents can be triggered from the dashboard, Slack, Claude, or Cursor to build, qualify, enrich, classify, personalize, and summarize messaging, and can run inside workflows. Developers work through the Knock CLI, MCP server, API, and SDKs for Node, Python, Ruby, Go, Java, .NET, Elixir, and PHP, with environments, version control, CI/CD validation, and log streaming.
Knock is intended for product, growth, and marketing teams alongside engineering, with non-engineers able to edit copy and targeting in the dashboard. It connects to 60+ channels, sources, and tools. Pricing details are available on the pricing page.
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