Send better SMS messages

Deliver SMS notifications with Knock. Build cross-channel notification experiences, easily debug messages sent, send fewer notifications with batching, throttling and more.

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Knock SMS Channel
Knock SMS Channel

Send fewer messages with batch and throttle

Knock comes with batching and throttling out-of-the-box, so you can aggregate multiple notifications into a single SMS message.

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Make complex, cross-channel notifications simple

Use Knock’s workflow builder to create sophisticated cross-channel notification experiences without adding complexity. Ship another channel in hours, not weeks.

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Unmatched observability and insights

Knock comes with tools to help you debug any issues with your sms notifications. Easily answer questions from engineering and support. Aggregate engagement data into a single place for your product team.

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See all channels →

Add SMS as a notification channel with our pre-built integrations.

Logo for Twilio


Connect with customers on their preferred channels—anywhere in the world. Quickly integrate powerful communication APIs to start building solutions for SMS and WhatsApp messaging, voice, video, and email.

Logo for Telnyx


Telnyx provides developers access to real-time voice and SMS capabilities via communication API. Get a free testing credit to start building today.

Logo for MessageBird


The world's most innovative companies build communication solutions using MessageBird's applications and APIs.

Logo for Africa's Talking

Africa's Talking

Africa's Talking is a Pan African communications and payments solutions provider. With simplified access to telco infrastructure, developers use our powerful SMS, USSD, Voice, Airtime and Payments APIs to bring their ideas to life.

Logo for Mailersend


MailerSend’s transactional SMS API enables you to enhance the customer experience by sending high-volume, toll-free SMS using a unique and recognizable phone number.

Logo for Vonage


Vonage offers flexible and scalable voice, messaging, video and data capabilities across Unified Communications, Contact Centers and Communications APIs.

Logo for Sinch


Connect with customers and make engagement personal with our simple, programmable SMS, voice, video, & verification tools. Find out more information today.