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Knock

The most powerful notification system you'll never build.·knock.app

Knock is customer engagement infrastructure that lets product, marketing, and engineering teams ship cross-channel messaging including email, SMS, push, in-app, Slack, and MS Teams notifications. It provides workflows, guides, broadcasts, and AI agents to orchestrate transactional and lifecycle messaging, along with data ingestion, segmentation, and personalization tools. The platform includes a dashboard, CLI, and SDKs for major programming languages, plus observability and template management for debugging and managing notifications at scale.

What it's for

Sending transactional and lifecycle notificationsBuilding in-app messaging like paywalls, dialogs, and nudgesSending multi-channel announcements/broadcastsTriggering workflows from product events or segment changesManaging user notification preferencesStreaming notification data to analytics/data warehouse toolsBuilding customer-facing activity feeds and inboxesPowering internal and customer-facing Slack alertsUsing AI agents to build, qualify, enrich, and personalize messaging

Features 18

AI agents for autonomous messaging creation and management
Batching and delay of notifications
Built-in multi-tenancy
Data ingestion from warehouses, CDPs, reverse ETL, and webhooks
Dynamic audience segmentation
In-app guides (paywalls, dialogs, nudges) with custom components
In-app, email, and mobile push channels
Knock CLI and MCP server for developer workflows
Multi-channel broadcasts for one-time announcements
Notification workflows for orchestrating cross-channel messaging
Observability and debugging tools for notifications
Personalized, AI-powered message content
SAML/SSO and directory sync (SCIM) for enterprise security
SDKs for Node, Python, Ruby, Go, Java, .NET, Elixir, and PHP
SlackKit for Slack-based notifications
Template management
User preference management (preference centers, send windows)
Version control and isolated environments

At a glance

free tierAPI

TypeWeb app

DeploymentCloud

PlatformsWeb

Forindependent developers, small-scale deployments, enterprises, Fortune 500 companies

CompanyKnock Labs, Inc.

Integrations

SlackMicrosoft TeamsSegmentRudderstackHightouchCensusDatadogSendGridPostmarkTwilioOktaActive DirectoryAmplitudeChatGPTCodexClaudeCursor

Complianceself-reported

SOC 2GDPRCCPAHIPAA

Resources

Pricing

Enterprise pricing is available on request and can be structured as flexible volume-based pricing or monthly notified-user pricing. Paid plans bill usage overages in arrears; billing begins when upgrading to a paid plan.

DeveloperFree

For testing and evaluation, or small-scale deployments.

10K messages/month, 500 guide active users/month, 500 AI agent credits/month

Starter$250/mo

For teams looking to start scaling cross-channel notifications.

50K messages/month, 2.5K guide active users/month, 2,000 AI agent credits/month included, then metered overage

EnterpriseQuote

For organizations with high volume, security, control, or support needs. Contact sales for pricing; volume and annual commit discounts available.

Flexible volume-based pricing or monthly notified user pricing; custom AI agent credit terms

Discounts available for high-volume customers on the Enterprise plan.