How do I set up Chat SDK iOS with Firebase?

Follow the Quick Start guide: add ChatSDK pods, configure the App Delegate with BConfiguration, set up Firebase project with GoogleService-Info.plist, and enable authentication methods. It involves several steps like adding security rules and push notification setup.

Chat SDK iOS vs Stream Chat: which is better?

Chat SDK is open-source and backend-agnostic, offering more control but requiring self-hosting. Stream Chat is a managed service with easier setup but less flexibility and higher costs at scale. Choose based on your need for control versus convenience.

Does Chat SDK support end-to-end encryption?

End-to-end encryption is available only as a Pro module, requiring sponsorship via GitHub or Patreon. The free base version lacks this feature, so secure messaging incurs additional cost.

Can I use XMPP instead of Firebase with Chat SDK?

Yes, Chat SDK supports XMPP backends like ejabberd or Prosody. You need to set up an XMPP server separately and use the Pro XMPP modules, as detailed in the XMPP setup guide.

How customizable is the chat UI?

Very customizable: you can register subclasses for view controllers or use BChatSDK.ui to override elements like login screens and chat views. The README shows examples for changing colors and integrating with existing interfaces.

Is Chat SDK free for commercial apps?

For under 1 million monthly active users, it's Apache 2.0 licensed and free for commercial use. Over that threshold, you must switch to GPLv3 (open-source) or purchase a commercial license.

Open-Awesome

chat-sdk-ios

NOASSERTIONObjective-C

An open-source iOS messaging framework with Firebase and XMPP backend support for building fully-featured chat apps.

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922 stars276 forks0 contributors

What is chat-sdk-ios?

Chat SDK for iOS is an open-source framework that enables developers to add fully-featured instant messaging functionality to their iOS apps. It solves the complexity of building chat systems from scratch by providing a ready-to-use solution with backend flexibility, supporting both Firebase and XMPP for data management.

Target Audience

iOS developers building applications that require real-time messaging features, such as social apps, community platforms, or customer support tools.

Value Proposition

Developers choose Chat SDK for its backend agnosticism, extensive feature set out-of-the-box, and scalability—all while maintaining full control over user data and avoiding vendor lock-in.

Overview

Chat SDK iOS - Open Source Mobile Messenger

Use Cases

Best For

Adding chat functionality to existing iOS apps without rebuilding infrastructure
Building messaging apps that require backend flexibility (Firebase or XMPP)
Creating scalable chat systems supporting millions of users
Developing social or community apps with real-time communication
Integrating customizable chat UI into branded applications
Implementing secure messaging with optional end-to-end encryption

Not Ideal For

Apps needing a fully managed chat backend without any server configuration (e.g., using a SaaS like SendBird)
Projects with strict licensing requirements that cannot accommodate GPLv3 or commercial fees for over 1M MAU
Teams exclusively using Swift who prefer native Swift frameworks over Objective-C based SDKs
Small-scale prototypes where the setup overhead for Firebase/XMPP outweighs the benefits

Pros & Cons

Pros

Backend Agnosticism

Supports both Firebase and XMPP (ejabberd, Prosody), allowing infrastructure flexibility as highlighted in the README's key principles.

Production-Ready Features

Includes private/group chats, multimedia messages, push notifications, and user profiles out-of-the-box, covering most messaging needs without custom coding.

Scalable Design

Built to handle millions of daily users with references to Firebase and XMPP scalability limits, making it suitable for high-growth applications.

Deep UI Customization

Allows complete override of view controllers and integration into existing apps, with examples in the README for customizing chat bubbles and views.

Cons

Complex Licensing Model

Switches to GPLv3 or requires a commercial license for apps over 1 million MAU, adding legal and cost overhead for successful projects.

Steep Setup Overhead

Requires configuring backend services (Firebase rules, APN keys, security rules) and multiple Podfile entries, which can be time-consuming and error-prone.

Core Features Paywalled

Essential functionalities like end-to-end encryption, read receipts, and audio/video messages are locked behind Pro modules, necessitating sponsorship or purchase.

Frequently Asked Questions

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