Knock

Overview

Knock is a notification infrastructure platform headquartered in New York[1][9] that provides managed services for product and customer messaging[2][3]. The company offers SDKs for multiple programming languages including Node, Python, Ruby, Go, Java, .NET, Elixir and PHP, along with a command-line interface and CI/CD integration[6]. Knock's platform supports email, SMS, in-app, push, Slack and MS Teams channels[2][3]. The company reports delivering hundreds of millions of messages monthly with a 99.99% uptime SLA and holds HIPAA, SOC 2, GDPR and CCPA certifications[5]. Knock's customer base includes Vercel, Webflow, Granola, Medium, Clay, Outreach, Gorgias, Discogs and Headway[4]. In February 2024, Knock announced a $12 million funding round from Craft Ventures[7]. The company operates with 11-50 employees[10] and offers tiered pricing including a free Developer tier and paid Starter and Enterprise plans[8].

Mailing address given as 175 Varick St, #413, New York, NY 10014. [2]

Knock ships SDKs for Node, Python, Ruby, Go, Java, .NET, Elixir and PHP, along with the Knock CLI, CI/CD integration and an MCP server for use with AI IDEs such as Cursor and Claude Code. [6]

Knock's pricing has a free Developer tier including 10,000 messages, a Starter tier at $250 per month including 50,000 messages, and custom Enterprise volume pricing that adds SAML SSO, HIPAA/BAA, directory sync and custom roles. [8]

Business address: 175 Varick St, #413, New York, NY 10014. [9]

Customers

Knock names Vercel, Webflow, Granola, Medium, Clay, Outreach, Gorgias, Discogs and Headway as customers. [4]

Growth & traction

Knock states it delivers hundreds of millions of messages monthly with a 99.99% uptime SLA, and is HIPAA, SOC 2, GDPR and CCPA certified. [5]

Knock's site lists a company size of 11-50 employees. [10]

Knock publicly launched its notifications infrastructure product on March 17, 2022, completed SOC 2 Type 2 in February 2022, achieved GDPR compliance in October 2022 and HIPAA compliance in January 2023. [11]

Funding history

Knock announced on February 15, 2024 that it raised $12 million from Craft Ventures to bring notification infrastructure to developers. [7]