环信 is a feature-rich instant messaging app developed by EaseMob Inc. It is a free app available on the iPhone platform. EaseMob Inc. is known for its commitment to technological innovation and has been recognized as a "Gartner 2016 Cool Vendor," making it the only SaaS customer service company in China to receive this honor. By the end of 2016, over 130,000 apps from more than 20 industries had chosen 环信 as their IM solution.

With the 环信 instant messaging cloud SDK, this app has a wide reach, covering over 1.4 billion mobile devices. The platform handles a staggering 1.07 billion messages per day, and it holds a market share of 77.4% in the SaaS mobile customer service market. Notable companies such as CITIC Securities, Gome Online, 58 Daojia, Shenzhou Car Rental, and Autohome have all chosen 环信 as their preferred IM solution.

EaseIM, built using the 环信 SDK, demonstrates how to create a comprehensive instant messaging app. It includes features like user registration and login, friend management, one-on-one and group chats, support for various message types including text, emojis, files, voice messages, images, and location sharing. Users can also make real-time audio and video calls through the app.