Knock
Flexible notification infrastructure for developers, with AI-native workflows.
About
Knock is notification infrastructure built for engineering teams. It provides a single API, SDKs, and a dashboard for building cross-channel notification workflows across in-app, email, SMS, push, and chat, with batching, delays, digests, multi-tenancy, environments, and delivery observability. Its founders previously worked together on notifications at Frame.io, where they felt the pain of building this in-house.
The company has moved toward AI-native workflows: a 2025 release added agent-led engagement features including AI workflow generation, an agent toolkit, and a local MCP server that brings machine-sent messaging under human control. Knock raised about $18M, including a Series A led by Craft Ventures announced in February 2024, and customers include companies like Vercel and Webflow. A free tier covers 10,000 notifications per month.
What it can do
- Single API for cross-channel notification workflows with batching and digests
- Version-controlled templates and isolated environments mapping to dev workflows
- Embeddable in-app feed components and subscriber preference management
- AI-native workflow builder, agent toolkit, and local MCP server
Setup
Sign up at knock.app, create workflows in the dashboard, and integrate the API or SDKs (@knocklabs/node and others).
Prerequisites
A product that sends notifications; provider accounts for email/SMS/push delivery channels you use.
Use cases
Works with
Trust score — 8/10
Scored 8/10 (verified tier, metrics-v1). Evidence: Verified via vendor site/docs/GitHub and reputable coverage, wave 97; Trending score 80/100 from researcher assessment.
Sources
Every fact above was checked against these sources. Where a claim comes from the provider and couldn't be independently verified, the text says so.