One platform to manage all your messaging—product, marketing, and transactional. Purpose-built for control, speed, and collaboration. What are you building? Ship messaging without limits. Flexible, AI-native tooling to build any messaging experience you want, without compromising on design, performance, or user experience. Ship messaging without limits. Flexible, AI-native tooling to build any messaging experience you want, without compromising on design, performance, or user experience. Send messages across email, SMS, push, chat, and in-app. Build complex messaging journeys with a single prompt. Deliver messages when and where your users expect them. Send messages across email, SMS, push, chat, and in-app. Build complex messaging journeys with a single prompt. Deliver messages when and where your users expect them. Never build an email again. Generate beautiful, client-safe emails in your layout and branding. User-first controls. Respect user time with preference centers and send windows. Never build an email again. Generate beautiful, client-safe emails in your layout and branding. User-first controls. Respect user time with preference centers and send windows. In-app messaging with your own components. Ship paywalls, dialogs, and nudges powered by your components. Enable non-engineers to edit copy and targeting in Knock. Join us at CollabConf! Sign up for online or in-person today. Introducing: faster uploads You’ve never seen file uploads like this. Introducing: Collab.io 4.0 A whole new way to collaborate with your team. Bigger, bolder assets Upgrade to upload and store assets over 250+ megabytes Introducing Collab AI Build and collaborate - faster than ever - with a helpful set of AI tools. Publish your site Learn how to publish your work to your clients Create a website from your Collab pages Launch week H1 2025 We’re excited to share a series of updates to Collaborato, all focused on streamlining collaboration for you and your team! A preview of what’s to come... Unify and activate your data. Ingest real-time data from your product, tools, and warehouse so you can trigger relevant, timely messaging based on any user attribute, event, or action. Unify and activate your data. Ingest real-time data from your product, tools, and warehouse so you can trigger relevant, timely messaging based on any user attribute, event, or action. Ingest data from your warehouse, CDP, reverse ETL, and webhooks. Build dynamic segments using attributes, events, and relations. Trigger workflows from API calls, usage events, or segment changes. Ingest data from your warehouse, CDP, reverse ETL, and webhooks. Build dynamic segments using attributes, events, and relations. Trigger workflows from API calls, usage events, or segment changes. Model your data. Sync custom objects for audiences and personalized templates. Personalize every message. Tailor messaging with AI-powered content, logic, and targeting.

Model your data. Sync custom objects for audiences and personalized templates. Personalize every message. Tailor messaging with AI-powered content, logic, and targeting. Built for developers and agents. The only customer engagement platform you can work with entirely from Cursor or Claude Code. Bring Knock to your development workflow with environments, version control, and the Knock CLI. Available SDKs SDKs available in all major languages Built for developers and agents. The only customer engagement platform you can work with entirely from Cursor or Claude Code. Bring Knock to your development workflow with environments, version control, and the Knock CLI. Available SDKs SDKs available in all major languages Knock CLI + your AI IDE. Bring all of Knock into your AI code editor with a single command. CI/CD integration. Validate work before you deploy to production. Knock CLI + your AI IDE. Bring all of Knock into your AI code editor with a single command. CI/CD integration. Validate work before you deploy to production. Built-in observability. Debug notifications with ease. Stream logs to external tooling. Version control. Make changes without impacting production. Rollback with a click. Built-in observability. Debug notifications with ease. Stream logs to external tooling. Version control. Make changes without impacting production. Rollback with a click. Messaging infrastructure you can trust. We take being a downstream provider seriously. Scaled delivery Knock delivers hundreds of millions of messages per month. " Easy access for our non-technical team " The level of visibility Knock provides into our notification system was a game-changer. Our customer service team can now easily access the entire history of a notification, from the initial template to the final delivered message. Engineering lead • Discogs " Notifications at scale " Notification infrastructure is the most essential part of any product that I'd never dare build myself from scratch or operate at scale. Knock's APIs allow me to focus on my front-end experience, while all the complexity is abstracted away. Founder & CEO • Vercel " Fantastic product, shipped in-app notifications in record time " We unblocked our marketing and education teams to start pushing in-app notifications in a couple days instead of a month or more. Install the React SDK, customize the CSS, and you're good to go. Engineering • Clay " What used to take weeks now takes minutes " Thanks to Knock's core functionality, our teams are able to easily build complex notification flows (batching, delays, multi-channel notifications, etc). The Knock dashboard is a powerful tool for visualizing notification templates and debugging. Staff software engineer • Amplitude " We collaborate faster with product and marketing " We wanted to increase our agility and be able to say "yes" more often to product and marketing teams. Knock was exactly what we were looking for. And now we're not wasting our time figuring out infra. We are just able to focus on driving adoption of new features. VP of Engineering • Webflow " It's been a great tool and a great team " Its comprehensive API and clear documentation allowed us to get a proof of concept running within days. The multi-channel support aligned perfectly with our vision for future notification capabilities. Software Engineer • Causal " Knock let us save on costs and focus on opportunities " I like how transparent the interface is when you send messages through. You can typically see a failure in a workflow execution right from the UI. That makes it really easy to diagnose when something's wrong. VP of Engineering • Nellis Auction " Easy access for our non-technical team " The level of visibility Knock provides into our notification system was a game-changer. Our customer service team can now easily access the entire history of a notification, from the initial template to the final delivered message. Engineering lead • Discogs " Notifications at scale " Notification infrastructure is the most essential part of any product that I'd never dare build myself from scratch or operate at scale. Knock's APIs allow me to focus on my front-end experience, while all the complexity is abstracted away. Founder & CEO • Vercel