Knock

Flexible notification infrastructure API for product teams

Code & DevelopmentFreemium

Knock is a notification infrastructure platform that provides a flexible API and workflow engine for sending notifications across email, in-app, SMS, push, and chat channels. Unlike simple transactional email APIs, Knock handles the complexity of notification preferences management, per-user opt-outs, digest scheduling, frequency capping, and cross-channel orchestration—all through a clean API. Its pre-built React components for in-app notification feeds speed up implementation for product teams.

Key Features

• ✓Multi-channel API
• ✓Preference management
• ✓Digest scheduling
• ✓Frequency capping
• ✓React components
• ✓Workflow engine