Knock is a notification infrastructure platform that helps product teams send and manage in-app, email, push, SMS, and Slack notifications from a single API. It centralizes notification logic, user preferences, workflows, and delivery tracking so developers do not need to build notification systems from scratch.
Knock offers a free tier for testing and low-volume use, with paid plans scaling by notification volume, team seats, retention, and advanced features. Paid tiers are generally positioned for developers, growth teams, and enterprises, with enterprise plans adding custom limits, SSO, audit logs, security reviews, and dedicated support. Exact pricing depends on notification volume and feature requirements, so teams should review Knock's current pricing page before committing.
Proprietary
Knock's biggest strength is its developer-friendly notification infrastructure, especially for teams building complex in-app and multi-channel notification systems. Its workflow engine, preference management, and delivery analytics can save meaningful engineering time. The main drawback is cost and complexity for very high-volume or enterprise-heavy use cases. It is best for SaaS products that need reliable, centralized notifications without building their own platform.
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