Google+ Hangouts API is described as 'The Hangouts API provides the programming interface to Hangouts video calls. It provides a JavaScript interface that enables your app to do such things as list the Hangout participants, share data between instances of your app in the Hangout, control some aspects of the user' and is an website in the development category. There are more than 10 alternatives to Google+ Hangouts API, not only websites but also apps for a variety of platforms, including SaaS, Android, iPhone and Android Tablet apps. The best Google+ Hangouts API alternative is Twilio. It's not free, so if you're looking for a free alternative, you could try TextBee or OpenTok. Other great sites and apps similar to Google+ Hangouts API are SMSAPI, Hilos by ActiveCampaign, Plivo and Tellephant.