
Amazon Lex
8.5#7 in chatbot builders$0.50 one-timeFree planAndroidiOSWebAPI
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Lex suits builders creating voice or chat assistants for self-service, information, transactions, enterprise productivity, or device control. It may also fit teams that want to connect bots with AWS services or contact-center channels.
You want what its maker publishes above — check its page for the details.