Knock

Knock is a customer engagement infrastructure platform designed to help product teams, marketing departments, and developers ship messaging at scale without building from scratch.

Key capabilities include:

• Multi-channel messaging - Send across email, SMS, push notifications, chat, and in-app messaging from a single platform
• AI-native workflow builder - Create complex messaging journeys with natural language prompts instead of manual configuration
• Data unification - Ingest real-time data from your warehouse, CDP, reverse ETL, and webhooks to trigger relevant messages based on user behavior
• Dynamic segmentation - Build audiences using attributes, events, and relationships for precise targeting
• Developer-first tools - Work entirely from your AI IDE with Knock CLI, version control, CI/CD integration, and SDKs in all major languages
• Non-technical controls - Enable marketing and product teams to edit copy, manage preferences, and adjust targeting without engineering support
• AI-powered personalization - Automatically generate beautiful emails in your brand, tailor content with dynamic logic, and respect user preferences with send windows

Built for reliability with 99.99% uptime, HIPAA and SOC2 compliance, and the ability to handle hundreds of millions of messages monthly. The platform includes built-in observability for debugging, version control for safe deployments, and comprehensive audit trails that give visibility across your entire notification system.