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Twilio

This company provides cloud communication software and APIs for businesses to integrate messaging, voice and video into their applications.

Sendbird

The company develops an application programming interface platform for businesses to integrate chat, voice, video and artificial intelligence agents into mobile and web applications.

SuprSend

This company provides a notification infrastructure and unified API for product and engineering teams to manage cross-channel messaging and user preferences.

46Elks

This company provides a communications API for developers to integrate SMS, MMS and automated voice calls into their software applications.

Novu

This company provides open-source notification and communication infrastructure for software developers and AI agents to reach customers across multiple digital channels via one API.

Courier

This software-as-a-service company provides a multi-channel notification platform for developers to manage and deliver messages across email, mobile and chat applications.

SendGrid

This company provides a cloud-based email delivery platform for businesses to send transactional and marketing messages to their customers.

OneSignal

This company provides a messaging platform for businesses to send push notifications, SMS and emails to mobile and web application users.