SendHub is a simple messaging service that lets users send and receive texts for free and access analytics on their performance. SendHub users can let their contacts join groups simply by texting a specified keyword. Users can send messages from any cell phone or web browser without having to install an application. The SendHub API lets developers integrate text messaging functionality into their own applications. Functionality includes sending messages, accessing contacts, viewing groups, viewing threads and more. The API uses RESTful calls and responses are formatted in JSON.