Knock — Communication

What is Knock?

Knock is a customer engagement platform that provides the infrastructure to build, edit, and ship messaging across email, SMS, push, chat, and in-app channels. It unifies product, marketing, and transactional messaging in one place, with AI-agent capabilities for automating workflows and generating content.

Problem it solves

Knock helps engineering and growth teams avoid the complexity of building and maintaining notification systems in-house. It streamlines cross-channel message orchestration, enables non-engineers to edit copy and targeting, and provides user preference controls to respect recipient time.

Who it is for

Knock is built for developers, product managers, and growth teams at SaaS companies, from independent developers to Fortune 500 enterprises. It is especially suited for teams that need scalable, multi-channel messaging with granular control and collaboration. It may be overkill for simple email-only use cases or teams with minimal messaging needs.

Real use cases

Knock is used to send transactional notifications (e.g., order updates), broadcast campaigns, in-app guides and paywalls, and AI-agent-driven conversational journeys. It caters to use cases where timeliness, personalization, and user preferences are critical.

• AI-native agentic tooling — Build complex messaging journeys with a single prompt.
• Cross-channel delivery — Send messages via email, SMS, push, chat, and in-app from one platform.
• AI-generated emails — Generate beautiful, client-safe emails in your brand layout without writing code.
• User preference controls — Provide preference centers and send windows to respect user time.
• Data unification — Ingest real-time data from your product, tools, and warehouse to trigger relevant messages.
• Collaboration for non-engineers — Allow non-technical team members to edit copy and targeting.

Knock pricing: from $0/mo.

For comparison: the median starting price in Communication is $15.99/month, measured across 153 tools we track. See the full SaaS Pricing Index →

Developer (Free)

$0/month — includes 10K messages, 500 guide active users, and 500 AI agent credits (then $0.01 per credit). Includes unlimited workflows, broadcasts, delivery channels, and team members, plus batch/delay notifications, multi-tenancy, and SSO via Google.

Starter

$250/month — includes 50K messages (then $0.005 per message), 2.5K guide active users (then $0.05 per user), and 2,000 AI agent credits (then $0.01 per credit). Everything in Developer, plus removal of Knock branding and email client previews.

Enterprise

Contact sales — flexible volume-based pricing or monthly notified user pricing, annual commit discounts. Everything in Starter, plus custom roles, per-customer branding, translation support, data warehouse send analytics, Datadog observability, SCIM, SAML SSO, enterprise SLAs, and HIPAA compliance.

All plans include a free trial; the Developer plan is free forever.

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