The most powerful notification system you'll never build.
Knock is flexible, reliable notifications infrastructure that's built to scale with you. Use our APIs to engage users, power cross-channel workflows, and manage notification preferences.
Move fast
Ship product notifications in hours, not months
Move fast with a notification engine that’s ready to scale from your first welcome email to a cross-channel system that puts your customer first. With Knock, you get a team that’s dedicated to one thing and one thing only: your notifications.
All the channels, for now and later
Start with email and in-app channels. Instantly add push, SMS, and Slack when you need them.
Pay-as-you-go
Predictable pricing that scales with you. No upfront fees or infrastructure set up required.
Built for scale and resiliency
Power high volume notifications without spending valuable engineering time on messaging infrastructure.
Built for developers
We obsess over the right abstractions so your team can focus on what matters.
- A single, unified API for all of your
notifications code - SDKs available in
all major languages - Comprehensive documentation
to help you get started - A CLI to work with
Knock resources locally - Powerful primitives to help
you model your system
Effortless in-app experiences
A real-time notification inbox, out-of-the-box
Drop in our pre-built, real-time enabled components to complete your notification experience in your app, backed by Knock’s powerful notifications infrastructure.
The control and flexibility you need
Bring your support, product, and engineering teams into Knock with fine grained access controls. Authenticate using SAML 2.0. Provision users with SCIM.
Learn more →
Secure, out of the box
Knock is SOC2 Type 2 certified as well as GDPR and HIPAA compliant. We run annual 3rd-party security penetration tests and employ enterprise-grade security practices to secure your customer data.
Learn more about our security practices →
Ready for any notification volume
Knock was built for enterprise-ready scale from day one. Learn more about how we’re powering notifications for enterprise-scale businesses.
Learn more about Knock Enterprise →Features
Your toolkit for product notifications
Commit, reset, and audit your changes. Knock uses the same versioning workflow you do.
Test changes in a development environment before promoting them to production.
Look under the hood from API request to workflow run to downstream messages to understand how your users are receiving messages.
Customize colors, themes, and layouts to present a consistent brand across all of your notification surface areas.
Leverage our built-in tenancy model to support per-tenant feeds and offer custom branding to your customers.
Easily test complex notification workflows across multiple channels, without needing to manually reproduce complex interactions in your product.
Don’t take our word for it
Read our case studies →
Theo Patt
Co-founder & CTO
With Knock we had an in-app feed up and running in minutes. Knock gave us the time back to focus on our core product and the peace of mind to know our notifications were built on a foundation that we can scale with moving forward.
Lukas Köbis
Co-Founder & CTO
We needed to implement Slack notifications for our finance platform fast, but didn't want to build it in-house, so we chose Knock.
We built our initial POC within hours and integrated Knock end-to-end within a sprint. We couldn't have rolled out our notifications feature this quickly without them.
Ali Rizvi
Software engineer
We came across Knock when we were looking to batch email notifications. With Knock, we were up and running in no time. The product is intuitive, the docs are great, and the team at Knock went above and beyond to make us successful. We were also able to easily do in-app notifications using Knock and build workflows that allow us to notify our customers over multiple channels.
I highly recommend Knock to anyone looking to build product notifications.
Anmol Maini
Full-stack engineer
We were looking to add in-app notifications to Standard Metrics when we came across Knock. Their well-documented APIs and composable React components made it super simple for us to get notifications up and running in minutes. Knock saved us countless hours and headaches from trying to build and scale this internally and let us focus on building our core product.
Rik Lomas
Founder & CEO
Adding notifications to products is hard. Knock has been invaluable for our product development and has saved us a ton of time. Knock's focus on great developer experience means that it has been incredibly easy to integrate best-in-class notification systems into new and existing products of ours.
Guillermo Rauch
Founder & CEO
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 frontend experience, while all the complexity is abstracted away.
Theo Patt
Co-founder & CTO
With Knock we had an in-app feed up and running in minutes. Knock gave us the time back to focus on our core product and the peace of mind to know our notifications were built on a foundation that we can scale with moving forward.
Lukas Köbis
Co-Founder & CTO
We needed to implement Slack notifications for our finance platform fast, but didn't want to build it in-house, so we chose Knock.
We built our initial POC within hours and integrated Knock end-to-end within a sprint. We couldn't have rolled out our notifications feature this quickly without them.
Ali Rizvi
Software engineer
We came across Knock when we were looking to batch email notifications. With Knock, we were up and running in no time. The product is intuitive, the docs are great, and the team at Knock went above and beyond to make us successful. We were also able to easily do in-app notifications using Knock and build workflows that allow us to notify our customers over multiple channels.
I highly recommend Knock to anyone looking to build product notifications.
Anmol Maini
Full-stack engineer
We were looking to add in-app notifications to Standard Metrics when we came across Knock. Their well-documented APIs and composable React components made it super simple for us to get notifications up and running in minutes. Knock saved us countless hours and headaches from trying to build and scale this internally and let us focus on building our core product.
Rik Lomas
Founder & CEO
Adding notifications to products is hard. Knock has been invaluable for our product development and has saved us a ton of time. Knock's focus on great developer experience means that it has been incredibly easy to integrate best-in-class notification systems into new and existing products of ours.
Guillermo Rauch
Founder & CEO
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 frontend experience, while all the complexity is abstracted away.
Guillermo Rauch
Founder & CEO
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 frontend experience, while all the complexity is abstracted away.
Rik Lomas
Founder & CEO
Adding notifications to products is hard. Knock has been invaluable for our product development and has saved us a ton of time. Knock's focus on great developer experience means that it has been incredibly easy to integrate best-in-class notification systems into new and existing products of ours.
Anmol Maini
Full-stack engineer
We were looking to add in-app notifications to Standard Metrics when we came across Knock. Their well-documented APIs and composable React components made it super simple for us to get notifications up and running in minutes. Knock saved us countless hours and headaches from trying to build and scale this internally and let us focus on building our core product.
Ali Rizvi
Software engineer
We came across Knock when we were looking to batch email notifications. With Knock, we were up and running in no time. The product is intuitive, the docs are great, and the team at Knock went above and beyond to make us successful. We were also able to easily do in-app notifications using Knock and build workflows that allow us to notify our customers over multiple channels.
I highly recommend Knock to anyone looking to build product notifications.
Lukas Köbis
Co-Founder & CTO
We needed to implement Slack notifications for our finance platform fast, but didn't want to build it in-house, so we chose Knock.
We built our initial POC within hours and integrated Knock end-to-end within a sprint. We couldn't have rolled out our notifications feature this quickly without them.
Theo Patt
Co-founder & CTO
With Knock we had an in-app feed up and running in minutes. Knock gave us the time back to focus on our core product and the peace of mind to know our notifications were built on a foundation that we can scale with moving forward.
Guillermo Rauch
Founder & CEO
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 frontend experience, while all the complexity is abstracted away.
Rik Lomas
Founder & CEO
Adding notifications to products is hard. Knock has been invaluable for our product development and has saved us a ton of time. Knock's focus on great developer experience means that it has been incredibly easy to integrate best-in-class notification systems into new and existing products of ours.
Anmol Maini
Full-stack engineer
We were looking to add in-app notifications to Standard Metrics when we came across Knock. Their well-documented APIs and composable React components made it super simple for us to get notifications up and running in minutes. Knock saved us countless hours and headaches from trying to build and scale this internally and let us focus on building our core product.
Ali Rizvi
Software engineer
We came across Knock when we were looking to batch email notifications. With Knock, we were up and running in no time. The product is intuitive, the docs are great, and the team at Knock went above and beyond to make us successful. We were also able to easily do in-app notifications using Knock and build workflows that allow us to notify our customers over multiple channels.
I highly recommend Knock to anyone looking to build product notifications.
Lukas Köbis
Co-Founder & CTO
We needed to implement Slack notifications for our finance platform fast, but didn't want to build it in-house, so we chose Knock.
We built our initial POC within hours and integrated Knock end-to-end within a sprint. We couldn't have rolled out our notifications feature this quickly without them.
Theo Patt
Co-founder & CTO
With Knock we had an in-app feed up and running in minutes. Knock gave us the time back to focus on our core product and the peace of mind to know our notifications were built on a foundation that we can scale with moving forward.
Guillermo Rauch
Founder & CEO
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 frontend experience, while all the complexity is abstracted away.
Rik Lomas
Founder & CEO
Adding notifications to products is hard. Knock has been invaluable for our product development and has saved us a ton of time. Knock's focus on great developer experience means that it has been incredibly easy to integrate best-in-class notification systems into new and existing products of ours.
Anmol Maini
Full-stack engineer
We were looking to add in-app notifications to Standard Metrics when we came across Knock. Their well-documented APIs and composable React components made it super simple for us to get notifications up and running in minutes. Knock saved us countless hours and headaches from trying to build and scale this internally and let us focus on building our core product.
Ali Rizvi
Software engineer
We came across Knock when we were looking to batch email notifications. With Knock, we were up and running in no time. The product is intuitive, the docs are great, and the team at Knock went above and beyond to make us successful. We were also able to easily do in-app notifications using Knock and build workflows that allow us to notify our customers over multiple channels.
I highly recommend Knock to anyone looking to build product notifications.
Lukas Köbis
Co-Founder & CTO
We needed to implement Slack notifications for our finance platform fast, but didn't want to build it in-house, so we chose Knock.
We built our initial POC within hours and integrated Knock end-to-end within a sprint. We couldn't have rolled out our notifications feature this quickly without them.
Theo Patt
Co-founder & CTO
With Knock we had an in-app feed up and running in minutes. Knock gave us the time back to focus on our core product and the peace of mind to know our notifications were built on a foundation that we can scale with moving forward.
Guillermo Rauch
Founder & CEO
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 frontend experience, while all the complexity is abstracted away.
Rik Lomas
Founder & CEO
Adding notifications to products is hard. Knock has been invaluable for our product development and has saved us a ton of time. Knock's focus on great developer experience means that it has been incredibly easy to integrate best-in-class notification systems into new and existing products of ours.
Anmol Maini
Full-stack engineer
We were looking to add in-app notifications to Standard Metrics when we came across Knock. Their well-documented APIs and composable React components made it super simple for us to get notifications up and running in minutes. Knock saved us countless hours and headaches from trying to build and scale this internally and let us focus on building our core product.
Ali Rizvi
Software engineer
We came across Knock when we were looking to batch email notifications. With Knock, we were up and running in no time. The product is intuitive, the docs are great, and the team at Knock went above and beyond to make us successful. We were also able to easily do in-app notifications using Knock and build workflows that allow us to notify our customers over multiple channels.
I highly recommend Knock to anyone looking to build product notifications.
Lukas Köbis
Co-Founder & CTO
We needed to implement Slack notifications for our finance platform fast, but didn't want to build it in-house, so we chose Knock.
We built our initial POC within hours and integrated Knock end-to-end within a sprint. We couldn't have rolled out our notifications feature this quickly without them.
Theo Patt
Co-founder & CTO
With Knock we had an in-app feed up and running in minutes. Knock gave us the time back to focus on our core product and the peace of mind to know our notifications were built on a foundation that we can scale with moving forward.
Build and ship delightful notifications in minutes
Batching, cross-channel delivery, and preference management - all on one platform. Send 10k notifications per month for free.
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