Amazon Lex vs Azure Bot Service: What are the differences?

What is Amazon Lex? Build conversational voice and text interfaces, using the same deep learning technologies as Alexa. Lex provides the advanced deep learning functionalities of automatic speech recognition (ASR) for converting speech to text, and natural language understanding (NLU) to recognize the intent of the text, to enable you to build applications with highly engaging user experiences and lifelike conversational interactions.

What is Azure Bot Service? Intelligent, serverless bot service that scales on demand. The Azure Bot Service provides an integrated environment that is purpose-built for bot development, enabling you to build, connect, test, deploy, and manage bots, all from one place.

Amazon Lex and Azure Bot Service can be categorized as "Chatbot Platforms &" tools.