The Yelp API gives you access to search for over 50,000,000 businesses in 32 countries. We provide a search, phone search, and business API to help integrate Yelp into your app.
For complete documentation and instructions on how to authenticate visit the developer site.
The official Android client library is yelp-android and will help integrate Yelp with Android phones.
For the official Python client library, we have yelp-python.
For the official Ruby client library, we have yelp-ruby. The sample Rails app will show you how to get setup if you need a little more guidance.
Please note that we do not provide support for any of the unofficial libraries, these are provided to you as-is. If you have any problems with them, please open an issue on the project itself.