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.
| Javascript | Swift | Android | Unity |
|---|---|---|---|
 |  |  |  |
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.