# Knock

> Knock is a New York-based notification and customer-engagement infrastructure company that gives developers a single API and dashboard to design, manage, and deliver messages across in-app, email, SMS, push, and chat channels. Founded in 2021 by former Frame.io leaders Sam Seely and Chris Bell, Knock lets product and engineering teams ship cross-channel notification workflows without building and maintaining an in-house system, and now powers messaging for companies like Vercel, Webflow, Amplitude, and Clay.

- **Founded:** 2021
- **Headquarters:** New York, New York, United States
- **Founders:** Sam Seely (Co-Founder & CEO), Chris Bell (Co-Founder & CTO)
- **Team size:** ~28 employees
- **Products:** Notification API & Workflow Engine, Multi-Channel Delivery, In-App Notification Feed & Components, User Preferences & Localization, Developer Tooling
- **Notable:** Raised $18M total, including a $12M Series A led by Craft Ventures (2024)., Adopted by 200+ enterprises including Vercel, Webflow, and Amplitude., Delivers hundreds of millions of messages per month with a 99.99% uptime SLA.

## Products & services

- **Notification API & Workflow Engine** — A core API and visual workflow builder for designing cross-channel notification logic, batching, delays, conditions, and branching without custom code.
- **Multi-Channel Delivery** — Unified delivery across in-app feeds, email, SMS, push, chat, Slack and Microsoft Teams from a single integration.
- **In-App Notification Feed & Components** — Prebuilt, customizable UI components and SDKs to embed real-time notification feeds and inboxes in web and mobile apps.
- **User Preferences & Localization** — Managed preference centers, per-user channel controls, quiet hours, and content localization/internationalization.
- **Developer Tooling** — CLI, CI/CD integration, version control for workflows, and SDKs for Node, Python, Ruby, Go, Java, .NET, Elixir, and PHP.
- **Observability & Analytics** — Built-in logs, debugging, audit logs, cross-channel analytics, and integrations with Datadog, New Relic, and Segment.
- **AI Agent Toolkit & MCP Server** — AI-powered workflow generation from natural-language prompts, an agent toolkit, and a local MCP server for AI communication with human-in-the-loop approval.

## Achievements

- Raised $18M total, including a $12M Series A led by Craft Ventures (2024).
- Adopted by 200+ enterprises including Vercel, Webflow, and Amplitude.
- Delivers hundreds of millions of messages per month with a 99.99% uptime SLA.
- Achieved HIPAA, SOC2, GDPR, and CCPA compliance for regulated customers.
- Shipped SDKs across eight+ major programming languages plus a CLI and MCP server.

## Latest updates

- **2024-02** — Knock announced a $12M Series A led by Craft Ventures, with David Sacks joining the board, bringing total funding to $18M.
- **2025** — Knock expanded into AI-led engagement with an agent toolkit, natural-language workflow generation, and a local MCP server for AI agents with human-in-the-loop approval.

## Links

- Website: https://knock.app
- LinkedIn: https://www.linkedin.com/company/knocklabs
- Twitter/X: https://twitter.com/knocklabs
- GitHub: https://github.com/knocklabs
- YouTube: https://www.youtube.com/@knocklabs

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Profile page: https://yespress.io/knock
Published by YesPress — https://yespress.io
Last updated: 2026-07-20