Best for
Engineering teams that want to stop building custom notification pipelines and hand content control to product teams.
Skip if
You just need a simple one-off email sender rather than full multichannel workflow infrastructure.
What is Knock?
Knock is a customer engagement and notifications platform that gives developers a single API and workflow builder for sending messages across email, SMS, push, chat, and in-app channels. Instead of building and maintaining custom notification pipelines, teams define reusable workflows with preferences, batching, and delivery logic, while non-technical teammates can edit content and audiences without redeploying code. Knock pulls in real-time data from data warehouses, CDPs, and webhooks to drive dynamic audience segmentation and personalized content, and it offers AI-assisted workflow creation from natural language prompts. It's used by companies like Vercel, Webflow, and Medium to handle hundreds of millions of messages per month, with SDKs for 8+ languages and compliance support for HIPAA, SOC2, GDPR, and CCPA.
SpecificationsAI-estimated
Key Features of Knock
Use Cases for Knock
Transactional notifications
Send order confirmations, password resets, and account alerts across email, SMS, and push from one workflow.
In-app notification feeds
Power a bell-icon notification center inside a product with real-time updates.
Marketing and lifecycle messaging
Trigger onboarding and re-engagement sequences driven by warehouse or CDP data.
AI agent notifications
Let AI agents trigger user-facing notifications through Knock's API and credits system.
Pros & Cons of Knock
Pros
- Free Developer tier includes 10,000 messages/month with all delivery channels unlocked
- Visual workflow builder lets non-technical teammates manage notification content directly
- Broad SDK coverage across 8+ languages simplifies integration for varied tech stacks
- Enterprise-ready compliance (HIPAA, SOC2, GDPR, CCPA) out of the box
Cons
- Starter plan jumps to $250/month, a steep step up from the free tier for growing teams
- Homepage pricing does not list specific per-channel costs, requiring a pricing page dive to compare
- Best suited to teams already comfortable integrating a dedicated notifications API rather than a plug-and-play tool
Frequently Asked Questions
Does Knock have a free plan?
Yes, the Developer plan is free and includes 10,000 messages per month with unlimited workflows.
What channels does Knock support?
Email, SMS, push notifications, chat, and in-app messaging.
Can non-developers edit notification content?
Yes, Knock's workflow builder allows product and marketing teams to edit messaging without redeploying code.
Is Knock compliant for regulated industries?
Yes, Knock supports HIPAA (with BAA), SOC2, GDPR, and CCPA compliance on its Enterprise plan.
Pricing Overview
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