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Knock Review

Knock is a developer-first, AI-native notification infrastructure designed for cross-channel messaging and complex workflow management.

shipped Jul 4, 2026aipaid
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Knock — product screenshot

Why it matters

1Provides a single API for notifications across in-app, email, SMS, Slack, and push channels.
2Offers AI agents for building, editing, and shipping messaging workflows.
3Supports comprehensive notification infrastructure for product and engineering teams.
4Includes features such as preference management, observability, and dynamic segmentation.

Specs

API Docs

View Documentation →

GitHub

View Repository →

API Available

Yes, public API

overview

What is Knock?

Knock is an AI-native notification infrastructure tool developed by Knock that enables product and engineering teams to manage and deliver cross-channel product and customer messaging. It provides a single API for sending notifications across various channels, including in-app, email, SMS, Slack, and push. The platform abstracts away the complexity of building and maintaining in-house notification systems, allowing teams to focus on core product development. It includes tooling for managing complex workflow logic, preference management, and observability, and supports real-time data ingestion for dynamic segmentation and AI-powered personalization.

features

Key Features of Knock

Knock offers a comprehensive suite of features designed to streamline notification management and delivery for product and engineering teams.

  • Single API for Cross-Channel Messaging: Unifies delivery across in-app, email, SMS, Slack, push, Discord, Microsoft Teams, and WhatsApp.
  • AI Agents: Facilitates building, editing, and shipping messaging with AI agents, managing product, marketing, and transactional communications.
  • Complex Workflow Logic: Provides tooling for orchestrating multi-channel workflows with features like isolated testing and versioned changes.
  • Preference Management: Offers a hosted preference center for users to manage notification preferences outside the application.
  • In-App Messaging (Guides): Enables contextual messages, paywalls, badges, dialogs, and nudges using native components.
  • Real-time Data Ingestion: Connects to product, tools, and data warehouses for dynamic segmentation.
  • Dynamic Audiences: Allows building versioned, previewable, and promotable dynamic audiences from the dashboard, CLI, or an agent.
  • Observability & Analytics: Provides strong logging, multi-environment support, and insights into notification engagement.
  • Multi-factor Authentication (MFA): Supports 2-step verification for dashboard login using TOTP-based authenticator apps.

use cases

Who Should Use Knock?

Knock is primarily designed for engineering, product, and growth teams seeking to manage and deliver sophisticated cross-channel product and customer messaging without building custom infrastructure.

  • Engineering Teams: To reduce the effort required to build, maintain, and scale notification systems using well-documented APIs and SDKs.
  • Product Teams: For orchestrating transactional messaging (e.g., order confirmations, password resets) and in-product messaging (e.g., guides, nudges).
  • Growth & Marketing Teams: To power lifecycle marketing campaigns, engagement sequences, retention flows, and one-time announcements (broadcasts).
  • Teams Requiring AI-Native Tooling: For leveraging AI agents and data functions to build complex messaging journeys, research, qualify, and personalize communications in real-time.

how to use

How to Use Knock

To begin using Knock, teams typically integrate its API and SDKs into their applications to centralize notification logic and delivery. The platform's dashboard provides a visual interface for workflow design and management.

  • 1Sign up for a Knock account and configure your workspace.
  • 2Integrate Knock's SDKs (e.g., Node.js, React, iOS, Android) or API into your application.
  • 3Define notification workflows in the Knock dashboard, specifying channels (email, SMS, in-app, etc.) and content.
  • 4Utilize AI agents to assist in creating, editing, and scheduling messaging resources.
  • 5Implement preference centers to allow users to manage their notification settings.
  • 6Monitor notification delivery and engagement using Knock's observability and analytics features.

pricing

Knock Pricing & Plans

Knock operates on a paid pricing model. Specific tier details, including features and message volumes, are available on their official pricing page. Users are encouraged to visit https://knock.app/pricing for the most current information on available plans and associated costs.

Pros

  • +Intuitive dashboard and powerful features simplify multi-channel notification management.
  • +Clean, well-documented APIs and comprehensive SDKs (8 server languages, React, React Native, iOS, Android, Flutter, Expo) enhance developer experience.
  • +Robust workflow management with isolated testing, versioned changes, and integrations (e.g., Clerk).
  • +Significant savings in engineering time by abstracting notification infrastructure complexities.
  • +Strong logging, multi-environment support, and analytics provide confidence and insights into notification engagement.
  • +Responsive support, including shared Slack channels for enterprise customers.

Cons

  • −Debugging issues with external mail server integrations (e.g., Mailjet) through Knock's platform can be challenging.
  • −Documentation for highly complex or niche use cases may require further detail or examples.

Policies

Pricing Page

View Pricing→

Similar Tools

Knock vs Competitors

Knock operates within the notification infrastructure market, competing with several platforms that offer multi-channel messaging and workflow orchestration. Its primary differentiator is its developer-first, AI-native approach.

1
SuprSendOn StorkCompare

SuprSend is a centralized notification infrastructure purpose-built for complex product notifications, offering a unified API for various channels and advanced workflow orchestration.

Similar to Knock, SuprSend targets engineering and product teams with a focus on transactional and product-driven messaging, providing a single API for multi-channel delivery and comprehensive workflow management, though its explicit 'AI-native' positioning is less emphasized in available descriptions.

2
CourierOn StorkCompare

Courier provides a robust, API-first notification orchestration platform with built-in AI tooling and a Model Context Protocol (MCP) for AI agents to build, test, and debug notifications.

Courier is very similar to Knock in offering a single API for multi-channel notifications and visual workflow builders, but it emphasizes its AI tooling and MCP for deeper AI agent integration, allowing AI coding tools to interact with its platform.

3
NovuOn StorkCompare

Novu is an open-source notification infrastructure platform that allows for self-hosting and offers a strong community, providing developers with greater control over their notification stack and supporting AI agent integration.

Novu mirrors Knock's multi-channel approach and workflow orchestration, including AI agent connectivity, but stands out with its open-source model and self-hosting options, which can be more appealing to teams prioritizing architectural control and cost efficiency.

4
OneSignalOn StorkCompare

OneSignal offers a unified customer engagement platform with a strong historical focus on push notifications, expanding to email, SMS, and in-app messaging for lifecycle journeys.

While Knock is developer-first for comprehensive AI-native notification infrastructure, OneSignal is often seen as more focused on product and growth teams for engagement, particularly strong in push notifications, and offers a more accessible entry point for mobile and web teams, also supporting MCP for AI agents.

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