✓ VERIFIED GTM · 86⭐ 2.1k GitHub
Knock
Email & MarketingCustomer engagement infrastructure for sending cross-channel product notifications, transactional messages, and lifecycle campaigns with developer-first tooling.
Knock is a notification infrastructure platform that enables product and engineering teams to build, manage, and send cross-channel messaging including email, SMS, push, in-app, and Slack notifications. Built with a developer-first approach, it offers a complete CLI, version control, environment management, and SDKs in 8+ languages making it compatible with AI coding tools like Cursor and Claude. The platform combines a visual workflow builder for non-technical teams with powerful APIs for developers, featuring batching, delays, user preferences, AI agents for workflow automation, and complete observability into notification delivery.
Best for
Product-led SaaS companies and engineering teams that need developer-friendly notification infrastructure with multi-channel support and want to enable non-technical teams to manage messaging.
Editorial profile generated March 19, 2026 · pricing & endpoint re-verified continuously (see badges above)
28/50
Overall Score
API Quality
10/10
GTM Relevance
18/20
PricingFreemium
Complexityeasy
Learningeasy
Visit knock.app →API Analysis
REST API
✓
Available
Webhooks
✓
Available
GraphQL
—
—
OAuth
✓
Available
slacksegmentamplitudemixpanelhubspotintercomzapiervercel
Pricing
freemiumFree Tier
Free tier available with usage-based pricing that scales based on messages sent per month. Enterprise plans include HIPAA, SOC2, GDPR compliance.
Listed pricing, as of Mar 2026 — not independently verified; confirm on the vendor's site before relying on it.
What users say
Themes from 147 real reviews on G2 · ★ 4.6
Users like
Easy to integrate and implement
Powerful workflow engine for cross-channel notifications
Good developer experience and documentation
Responsive and helpful support team
Users dislike
Limited customization options for some features
Pricing can be high for smaller teams
Some features still in beta or development
Alternatives
Reviews
Links
FAQ
What is Knock?
Knock is a notification infrastructure platform that enables product and engineering teams to build, manage, and send cross-channel messaging including email, SMS, push, in-app, and Slack notifications. Built with a developer-first approach, it offers a complete CLI, version control, environment management, and SDKs in 8+ languages making it compatible with AI coding tools like Cursor and Claude. The platform combines a visual workflow builder for non-technical teams with powerful APIs for developers, featuring batching, delays, user preferences, AI agents for workflow automation, and complete observability into notification delivery.
Is Knock free?
Yes, Knock offers a free tier. Free tier available with usage-based pricing that scales based on messages sent per month. Enterprise plans include HIPAA, SOC2, GDPR compliance. Pricing shown is as last reviewed and may change — confirm current pricing on the vendor's site.
What are Knock alternatives?
Popular alternatives to Knock include Customer.io, Intercom, Segment, SendGrid, Mailgun. Compare features, API quality, and pricing on GTM Tools.
Does Knock have an API?
Yes, Knock provides a REST API. API quality is rated EXCELLENT. Documentation: https://docs.knock.app.
Who is Knock best for?
Product-led SaaS companies and engineering teams that need developer-friendly notification infrastructure with multi-channel support and want to enable non-technical teams to manage messaging.
How current is Knock's data on GTM Tools?
Endpoint reachability and pricing for verified-tier tools are re-checked on a schedule — see the verification badges on this page for the latest check. The editorial profile (description, strengths and weaknesses) is last generated March 2026, and any user-review themes are pulled from G2.