Communication APIs

Open source & scalable, multi-user conferencing based on WebRTC. Designed to provide everything you need to build real-time video audio data capabilities in your applications.

The Open Source, Cross Platform Stack for Real-time Media and Data Communication.

Email Delivery Platform to test, send and control email infrastructure in one place. Great for dev teams. Start today - Sign Up free!

Powerful Transactional Email APIs that enable you to send, receive, and track emails, built with developers in mind. Learn more today!

Drive deeper customer engagement with secure, personalized communications across SMS, RCS, Email, Voice, WhatsApp, and more.

Bird is the next-generation CRM for Marketing, Sales, and Payments, powering over 5 trillion annual messages across Email, SMS, and WhatsApp.

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

Postal is a complete and fully featured mail delivery platform for use by websites & web servers. Think Sendgrid, Mailgun or Postmark but open source and ready for you to run on your own servers.

Email for developers. The best way to reach humans instead of spam folders. Build, test & deliver transactional and marketing emails at scale.

Boost app engagement with modern chat, voice and video features. Quickly build your custom in-app experience with Sendbird's Chat API and SDK.

The Real-Time Engagement Platform for meaningful human connections. Embed vivid voice and video in any application, on any device, anywhere.

The open-source notification infrastructure. The ultimate library for managing multi-channel transactional notifications with a single API.

Looking for an effective SMS Gateway Solution for your Business? With D7 SMS gateway, send SMS online globally with 100 percent delivery rate.

Text Messaging API and User Authentication. Reach customers globally with an easy to integrate messaging API and authentication service.

Courier is a notification API built for developers. Design once, and deliver to any channel – email, Slack, SMS, push, and more – all through a single API.

Build scalable in-app chat or activity feeds in days. Product teams trust Stream to launch faster, iterate more often, and ship a better user experience.

Voximplant’s platform is a full-featured CPaaS for voice, video & messaging. Innovate and scale real-time communications with cloud-based call center solutions. Improve communication processes now.

Plivo’s SMS API and Voice API platform enables businesses to communicate with their customers on a global scale. Sign up for free now.

Global Voice and SMS API for smarter user interactions. Create automated, personalized and contextual communication with our API covering 200+ countries

Delivering your transactional and marketing emails through the world's largest cloud-based email delivery platform. Send with confidence.

Trusted by thousands of developers, Postmark is a fast and reliable application email service. Send with Postmark to ensure your emails get to the inbox on time, every time.

With Twilio, unite communications and strengthen customer relationships across your business – from marketing and sales to customer service and operations.

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