The most efficient way to send SMS notifications

Ship reliable, cost-effective SMS experiences that reach users anywhere.

Knock SMS Channel
Webflow
Medium
Outreach
Clay
Headway
Discogs

Send text messages from any SMS provider you already use.

Send text messages from any SMS provider you already use.

Build messaging journeys in our intuitive drag-and-drop editor.

Build messaging journeys in our intuitive drag-and-drop editor.

Deliver messages when and where your users expect them.

Deliver messages when and where your users expect them.

On-brand, error-free messaging. Reusable content blocks, custom domains for link tracking, and live device previews.

On-brand, error-free messaging.

User-first controls. Respect user time with preference centers and send windows.

User-first controls.

Understand every interaction. Track delivery and analyze engagement to know what’s working.

Understand every interaction.

Messaging
infrastructure
you can trust.

99.99% uptime

We take being a downstream provider seriously.

Scaled delivery

Knock delivers hundreds of millions of messages per month.


HIPAA

SOC2

GDPR

CCPA


Trusted in production at

"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.

Troy Blakely
Troy Blakely

Engineering leadDiscogs

"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.

Guillermo Rauch
Guillermo Rauch

Founder & CEOVercel

"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.

Dane Williams
Dane Williams

EngineeringClay

"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.

Chamila Amithirigala
Chamila Amithirigala

Staff software engineerAmplitude

"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.

Utkarsh Sengar
Utkarsh Sengar

VP of EngineeringWebflow

"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.

Charlie Crisp
Charlie Crisp

Software EngineerCausal

"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.

Brian Lee
Brian Lee

VP of EngineeringNellis 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.

Troy Blakely
Troy Blakely

Engineering leadDiscogs

"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.

Guillermo Rauch
Guillermo Rauch

Founder & CEOVercel