Introduction

This section of the chat documentation explains how to use the PubNub SDKs to build in-app chat on Mobile and Web applications. Choose a language and follow the instructions below to include the SDK in your application. The full SDK reference documentation and docs for additional languages are available at PubNub SDK Docs.

Client SDKs

Javascript	Swift	Android	Unity

Server SDKs

Javascript	Java	C#/.NET	Go

Features

Use our Chat SDKs to easily add rich chat features to your applications.

• Direct & Group Spaces - for private messaging between two users or multiple users in a group.
• Message History - fetches missed messages from storage based on timestamp of the last read message.
• User Presence - tracks when users join or leave chat channels or shows occupancy of a channel.
• Typing Indicators - to indicate when a user starts or stops typing.
• Image & File Sharing - to upload and share images or files.
• Unread Message Counts - to show counts of unread messages on chat channels.
• Delivery & Read Receipts - to indicate if a message has been delivered or read.
• Emoji Reactions - to add emoji reactions to messages.
• Mobile Push Notifications - delivers messages via APNS/FCM mobile push services when the app is closed or running in the background.
• Security Controls - to encrypt messages or restrict user access to channels.
• Chatbot Integrations - built on PubNub's serverless Functions or using third party integrations.
• Content Moderation & Profanity Filters - filters messages based on some of its attributes, so that only messages with acceptable content are passed to subscribing clients.
• Language Translation - mutates messages in-flight, altering the final message received by users to be in their requested language.
• External Message Storage - saves your messages to an external database to enable full-text searching, archiving, and more.