# Zephr SDK

Zephr uses web APIs for all its functionality. These are split into two categories: the Admin API and the Public API. All functionality of the system can be controlled by the Admin API. The Public API is used for client-side implementations and is tightly linked to a user’s session.

You can read the Admin API and Public API specifications online.

The Zephr SDK is a wrapper around the Zephr APIs allowing for rapid integration development. The Zephr SDK is supplied in JavaScript, Browser SDK, Swift, and PHP.

For Zephr SDK tutorials, see the following:

* [Server-side Integration Guide using Zephr JavaScript SDK](/zephr-docs/zephr-sdk/zephr-sdk-tutorials/server-side-integration-guide-using-zephr-javascript-sdk) for integration instructions.
* [OAuth on iOS using the Swift SDK](/zephr-docs/zephr-sdk/zephr-sdk-tutorials/oauth-on-ios-using-the-swift-sdk)for integration with Zephr’s OAuth social sign-in.


For Zephr SDK references, see the following:

* [JavaScript](/zephr-docs/zephr-sdk/zephr-sdk-reference/javascript-sdk)
* [Browser SDK](/zephr-docs/zephr-sdk/zephr-sdk-reference/browser-sdk)
* [Swift](/zephr-docs/zephr-sdk/zephr-sdk-reference/swift-sdk) (recommended for iOS development)
* [PHP](/zephr-docs/zephr-sdk/zephr-sdk-reference/php-sdk)


**Note**: For Android, we recommend making HTTP calls to our Web API using the HTTP client of your choice.