Knock

What Knock does

Customer messaging infrastructure for software products, now pitched as 'agentic customer engagement'. You design workflows once (triggers, delays, branches, batching/digests, user preferences) and Knock sends the messages across email, in-app feed/inbox, in-app guides (banners, modals, tooltips), push, SMS and chat (Slack, Microsoft Teams). It covers transactional, lifecycle and product messages plus one-off broadcasts. AI layer: a dashboard 'Knock agent' that builds and edits workflows, templates, broadcasts and audiences by chat and answers analytics questions; an 'agent' workflow step that runs an LLM prompt (e.g. Claude Haiku/Sonnet) to enrich or personalise each message; a remote MCP server (mcp.knock.app/mcp, OAuth); a Claude connector and ChatGPT/Codex, Cursor and Grok Bot plugins; a CLI (@knocklabs/cli) and open-source agent skills. For SaaS founders, product and growth teams and developers; you still connect your own email/SMS/push providers for production sending.

Good for

• Add the Knock connector to Claude (claude.ai/directory/connectors/knock, sign in with Knock) and ask: 'Build an onboarding journey: welcome email on day 0, tips email on day 3 if they haven't created a project.' Review the draft workflow in the dashboard before it goes live
• In the dashboard, press Cmd+J and ask the Knock agent 'Which channel drives the most engagement this month?' to get a chart and a plain-language answer
• Add an agent step to a weekly digest workflow that summarises each user's activity, and test it in the editor (test runs don't use credits)
• Use Knock's built-in test email provider to send yourself a trial message before you connect SendGrid, Resend or Postmark
• Claude Code: claude mcp add --transport http knock mcp.knock.app, then /mcp to sign in and ask it to create a test user and trigger a workflow

Honest take

Some claims not independently checked

• The 'agentic' rebrand sits on top of it, and the AI pieces are real and documented (docs.knock.app/ai: agent, agent function, MCP server, CLI, skills, plugins).
• Caveats: (1) it's built for a software product with users.
• You need to send it user data and events (SDK/API, or a CDP such as Segment), so a no-coder without an app has little to send.
• (2) Production email/SMS/push go through your own providers; Knock's own email provider is for testing only.
• (3) Free tier is generous for trying it (10K messages), but the next step is $250/month, a big jump for a small business.
• Agent steps burn credits ($0.01 each beyond the allowance), and per-model credit rates aren't on the pricing page.
• (4) The MCP server and agent have full read/write access to messaging configs, so review before publishing and use service tokens carefully.
• Compare with Customer.io, Braze, Courier, Novu (open source) and Loops for simpler email.
• X: @knocklabs.

What we couldn’t verify

• Fact vs hype: Knock is an established notification platform.
• Claims like 'customer engagement that runs itself' are marketing: Knock agents propose changes on a branch for your review, and output quality depends on your data and prompts.

Pricing

Free $0/month (no card): up to 10,000 messages sent, 500 in-app guide recipients and 500 agent credits per month; unlimited workflows, channels, profiles and team members; Knock branding shown. Starter $250/month + usage: 50,000 messages then $0.005 each, 2,500 guide recipients then $0.05 each, 2,000 agent credits then $0.01 per credit; removes branding, adds email client previews and priority email support. Enterprise: Contact sales / book a demo (no public pricing); adds SSO/SCIM, audit logs, translations, per-tenant branding, HIPAA/BAA, 90-day logs. The dashboard Knock agent doesn't use credits; agent workflow steps do (cost varies by model and web search). Email/SMS/push provider fees (e.g. SendGrid, Twilio) are separate.

Prices as listed by the maker when we last checked (2026-10-28); usually in US dollars. Check the website for current prices.

Latest update

• 2026-10-28 (as checked): the site pitches Knock as 'agentic customer engagement infrastructure', with a dashboard Knock agent, an agent workflow step, a remote MCP server, Claude/ChatGPT/Cursor/Grok Bot plugins, a CLI and ready-made starter prompts (onboarding, trial ending, win-back, NPS, failed payment). The rebrand date isn't verified.
• 28 October 2026: New entry: Knock, notification and customer-messaging infrastructure (email, in-app feed and guides, push, SMS, Slack/Teams) with an AI layer: a dashboard agent, an agent workflow step, a remote MCP server and Claude/ChatGPT/Cursor/Grok Bot plugins. Free up to 10K messages/month; Starter $250/month.

Is Knock worth it? Quick answers