Overview

2026-05-12

What's the Video Call

ZEGOCLOUD's Video Call SDK is a service that helps you build the most full-featured video experience into web and mobile applications. You can extend the SDK with a bunch of features, such as screen sharing, recording, or upgrading using an add-on to quickly integrate virtual avatars, instant messaging, and more.

Video Call allows much more fine-grained control over what's to be built, custom audio and video pre & post-processing, virtual stereo, 10K concurrent speakers, and way more for you to build your interactive video experiences as wanted.

When to use

To help you build a video app that you exactly want, we've got you two types of SDKs, covering all phases and all your considerations: the SDK and the UI Kit, these two get you all you need for building a video app in two ways.

Summary:

If you are in the app feature development or feature upgrading phases and want the most control of your video app, the Video Call SDK is the Top Pick. When you are in the startup / trying phases, fund-seeking phase, or testing & POC phase and considering the budget issue, the Call Kit is your best choice to build an app in a short time.## Language and Framework Support

What are the steps

1. Sign up and create a project

2. Quick start

Integrate the SDK and implement a basic 1-on-1 video call as instructed.

3. Use Tokens for authentication

Set up secured server authentication.

Get help

Anything you encounter or are curious about can get responses here.

Feature Metrics

2026-05-12

Feature	Express Video Metrics
SDK Package Size	Incremental size added to your app after integrating the full-featured Express Video SDK package: iOS (arm64): 7.57 MiB Android (arm64): 8.68 MiB Android (armv7): 7.95 MiB macOS (x86_64): 10.52 MiB Windows (x86): 11.08 MiB Windows (x86_64): 13.35 MiB Linux (x64): 12.93 MiB Note The above data refers to the size of the full-featured SDK package. If package size is critical for you, please contact ZEGO technical support for SDK feature customization. For more details, see What is SDK package size increment?.
Multi-Party Audio/Video	Supports 10,000 real-time audio and video streams.
Video Quality	SDK capture supports 4K resolution and 1 fps ~ 60 fps frame rates. Low latency: Normal latency range 200 ms ~ 400 ms.
Audio Quality	Audio sampling rate: 16 kHz ~ 48 kHz. Supports mono and stereo channels.
End-to-End Latency	As low as 200 ms.
Packet Loss Resistance	Audio: Up to 80% packet loss resistance (uplink & downlink). Video: Up to 70% packet loss resistance (uplink & downlink).
Low Bandwidth Resistance	Audio: Uplink and downlink bandwidth as low as 30 kbps. Video: Uplink and downlink bandwidth as low as 50 kbps.
IP Protocol	IPv4, IPv6.
Massive Concurrency	500+ BGP nodes worldwide, providing a stable global content distribution network.

Language and Framework Support

iOS(Objective-C) iOS(Swift) Android(Java) Android(Kotlin) macOS(Objective-C) macOS(Swift) macOS(C++) Windows(C++) Windows(C#) Linux(C++) Linux(Java) Web(JS) Flutter(Dart) Electron(JS) Unity3D(C#) React Native(JS) Cocos Creator(TS)