Knock

A messaging infrastructure platform that centralizes product, marketing, and transactional notifications across email, SMS, push, chat, and in-app channels and provides workflows, templates, and automation to trigger and personalize messages. It is for developers, engineering and product teams, and marketers at B2B companies who build and operate customer engagement. It is delivered as a SaaS API platform with AI-native agents, workflows, and infrastructure-as-code tooling including a CLI and MCP server.

Key features

• Send across email, SMS, push, chat, in-app
• Build messaging workflows and journeys
• Broadcast messaging
• AI agents for messaging
• Template management
• Generate client-safe branded emails
• Preference centers and send windows
• In-app messaging with own components
• Observability and analytics
• Infrastructure as code
• Ingest data from warehouse, CDP, webhooks
• Build dynamic segments
• Trigger workflows from API and events
• Sync custom objects for personalization
• AI-powered content and targeting