Voice assistants are voice-based conversational interfaces paired with intelligent cloud-based back-ends. Examples of voice assistants include Amazon Alexa, Apple Siri, Google Home, and Microsoft Cortana. Increasingly, vendors are positioning their devices as intelligent assistants, being used to perform real-world tasks. This is not just playing music or telling you the weather. This requires at least a minimum level of intelligence to perform without frustrating the user. In this report, Cognilytica evaluates the intelligence and knowledge graph capabilities of four voice assistants: Amazon Alexa, Google Assistant (Home), Apple Siri, and Microsoft Cortana. We want to know — just how intelligent is the AI back-end?