AWS Lex

AWS Lex is Amazon's conversational AI service built on the same technology that powers Alexa. It handles automatic speech recognition (ASR) and natural language understanding without your team having to train or tune language models. You define intents and slots (entities) in the console, and Lex handles the rest, scaling automatically on AWS infrastructure. It works across voice phone systems, web interfaces, and messaging platforms.

Lex appeals to teams already on AWS who want to avoid managing ML infrastructure. The speech recognition quality is high thanks to Alexa's backing. It's simpler to set up than Dialogflow if you're AWS-native, though it has fewer native integrations and language support is more limited. For enterprises building contact center automation within the AWS ecosystem, it's a natural fit.