Twilio API for WhatsApp

SendBird is a Messaging SDK, Chat API, and fully managed chat infrastructure for your mobile apps and websites. Embeddable chat for iOS, Android, JavaScript, Unity, .NET.

Use the Messaging API to build bots that provide personalized experiences for your users on LINE. You associate your bot with a channel on the LINE Platform. The bot works behind the LINE Official Account that is generated when you create the channel if you operate the account in bot mode.

Agora.io provides building blocks for you to add real-time voice and video communications through a simple and powerful SDK. You can integrate the Agora SDK to enable real-time communications in your own application quickly.

It adds the clarity and emotion of face-to-face communication to your brand whether you're developing for the web, iOS, or Android. We make the integration of high-quality live video a breeze so that you can focus on building a great product.

Sinch makes it easy for developers to add voice, messaging and SMS to their apps with just a few lines of code. Enrich your apps with communications that your users will love.

Add powerful communication features to your mobile app and data services for your backend<br>

Chatkit is designed to make it as simple as possible to add chat to your app. It lets you add 1-1 and group chat to your app, along with typing indicators, file attachments and storage, user online presence and a flexible permissions system.

Chat API and SDK. With a beautiful UI Kit, easy to use React Components and powerful API. Add Chat to any application in a matter of hours. The tech uses Go, RocksDB and Raft. By the creators of Stream, the API that powers activity feeds for more than 300 million users.

Layer's asynchronous messaging fabric is capable of transporting payloads of any type. Get your users talking with chat, voice or video messaging. Pull them back in with push. Connect friends, colleagues or perfect strangers seamlessly.

TalkJS provides a chat API & Javascript SDK with a pre-built UI that allows developers to add chat between users on websites and apps in hours instead of months.

CometChat offers a comprehensive in-app chat SDK platform that equips businesses with the tools to integrate real-time chat, voice, and video into their applications.

LiveKit is a set of APIs and SDKs which make it easy to build and scale live video and audio features in your application. Use cases include interactive live streaming, video calls, communications in games, and robotics teleoperations.

Create a better customer experience with SMS, Chat Apps, Video Interaction & Voice. It’s integrated communications platform as a service (CPaaS) streamlines multiple communications channels into a single dashboard.

Moxtra is the contextual communication + collaboration layer for your mobile and web applications|. Enhance user engagement by adding in-app communication+collaboration. Integrate chat, voice meetings, screen sharing and recording, and multimedia annotation. The Moxtra Cloud is mobile-first and is built to scale on demand to meet your growing needs.

It is a unified communications server software that brings together IP PBX, email, IM, faxing and collaboration functionality. It has a Web interface and includes capabilities such as a call center software with predictive dialing.

An open and extensible chat SDK and APIs for building powerful 1:1 and group chat quickly. Build core chat features quickly, extend functionality with a rich plugin library and customize with programmable Functions-as-a-Service. Powered by the PubNub Network.

Add In-App User-to-User Communication into Mobile Apps & Websites, with rich & engaging Text Chat, Video, and Audio Calling experiences, to Increase User Engagement and Enable new Revenue Streams.

Quickly add Voice, Video, SMS to your web and mobile applications. It is a communication platform which provides APIs that help clients quickly add Voice/Video/SMS to any application.

Add video and audio chat to any app, in minutes. Daily's APIs help developers build the best possible video experiences, quickly and easily. Use our Prebuilt UI or build completely custom video conferencing interfaces.

It is a simple and secure mobile and web chat library that enables you to add messaging in just a few minutes on your android, iOS, and web apps. No need to develop or maintain any infrastructure.

It brings rich communication APIs to all your applications across any device, on any platform, using the same reliable and secure infrastructure that powers Microsoft Teams.

Popcorn Notify is designed to be an effortless method for sending emails and text messages from your code. Client libraries are simple to install and are available on pip and npm.

Scringo offers a unique Community &amp; Messaging Platform that turns every app into an independent, dynamic &amp; fully functional social network.

It provides realtime Chat SDK and Messaging API for Mobile Apps and Websites. It is developer friendly and can be installed into Android, iOS and Javascript applications within minutes.

It is a readymade chat solution on Android, iOS & Web. Its diverse uses of social, enterprise, in-app, and personal chat. It is 100% customizable, with full access to the source code.

MirrorFly is a leading CPaaS provider offering customizable text, voice, and video chat solutions for enterprises. The self-hosted Chat APIs and SDKs enable businesses to build their own chat platform with 1000+ messaging features.

It is ‪a chat API and SDK that enables users to build chat messaging functionality into their apps or websites within minutes, saving them months of development time.‬

The Talkray Developer API is a white-label cloud-hosted platform to easily enable all forms of real-time and asynchronous&nbsp;communication&nbsp;between your mobile users.&nbsp;With a few lines of code, you can connect your users together at&nbsp;unparalleled&nbsp;speed and scale.&nbsp;

ZEGOCLOUD provides global developers with real-time audio/video SDKs, AI Agents, low-latency live streaming, and in-app messaging solutions. Build high-quality voice chat, video calls, interactive live streams, and AI-powered companion or support experiences with a few lines of code.

It is a complete sticker API for up-to-date chat interfaces. Engage your users with a fun, dynamic stickers. Give them the freedom to express and interact – and stay with you.

It is an open source Conversational Platform to store, structure and utilize conversational data in a secure and privacy-compliant way. It can power a variety of use cases, from hosting your own Messaging API to integrating with Conversational AI.