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Amazon Lex

aws.amazon.com

From $0.50/mo Free plan WebiOSAndroidAPI
Visit aws.amazon.com
Spec score 9.1 #1 of 41 in Conversational AI Platforms

What it is

Amazon Lex lets application builders create conversational interfaces that respond to natural-language voice or chat input. It combines automatic speech recognition for voice with natural language understanding for voice and text interactions. Builders can use a visual flow builder and AI bot generation. The Automated Chatbot Designer analyzes conversation transcripts and proposes an initial design with intents and slot types; Test Workbench supports creating test sets and reviewing results. For FAQ responses, an intent can query an authorized knowledge source and foundation models from Amazon Bedrock. Bots can be deployed on mobile devices and chat services including Facebook Messenger, Slack, Kik, and Twilio SMS. AWS integrations include Lambda for backend logic, Cognito for authentication, Polly for text-to-speech, and Amazon Connect for contact centers. Lex is available for Android, iOS, web, and API use. Text and speech requests use pay-as-you-use pricing, with no upfront commitment or minimum fee in the listed examples. Automated Chatbot Designer training time is listed at $0.50 a month, with pricing described as per minute of training time. The AWS Free Tier is available for six months after account creation, with credits subject to stated eligibility and expiry terms.

Spec sheet

Purpose
Amazon Lex builds conversational interfaces for applications using natural language voice or chat.Read 3 Oct 2026 · aws.amazon.com
Free plan
NoRead 21 Sep 2026 · aws.amazon.com
AI bot generation
YesRead 21 Sep 2026 · aws.amazon.com
AWS integrations
Lex integrates with AWS Lambda for backend business logic, Amazon Cognito for user authentication, and Amazon Polly for text-to-speech.Read 3 Oct 2026 · aws.amazon.com
Bot design
The Automated Chatbot Designer analyzes conversation transcripts and proposes an initial bot design with intents and slot types.Read 3 Oct 2026 · aws.amazon.com
Channels
Bots can be deployed across mobile devices and chat services including Facebook Messenger, Slack, Kik, and Twilio SMS.Read 3 Oct 2026 · aws.amazon.com
Contact centers
Lex natively integrates with Amazon Connect, and AWS says pre-built integrations with other contact center solutions are available.Read 3 Oct 2026 · aws.amazon.com
Conversation testing
Test Workbench lets builders create and run test sets and review aggregated performance results and detailed insights.Read 3 Oct 2026 · aws.amazon.com
Deployment channels
multichannelRead 21 Sep 2026 · aws.amazon.com
Generative AI
Lex supports conversational FAQ responses using an intent that queries an authorized knowledge source and foundation models from Amazon Bedrock.Read 3 Oct 2026 · aws.amazon.com
Human handoff
YesRead 21 Sep 2026 · aws.amazon.com
Knowledge-base answers
YesRead 21 Sep 2026 · aws.amazon.com
Language availability
Amazon Lex V2 supports multiple languages and locales, while some features are limited to particular languages or locales.Read 3 Oct 2026 · docs.aws.amazon.com
Maker history
Amazon Web Services says it launched in 2006.Read 3 Oct 2026 · aws.amazon.com
Pricing model
Lex charges based on usage, with request-and-response and streaming conversation interaction models and no upfront commitment or minimum fee.Read 3 Oct 2026 · aws.amazon.com
Security and compliance
Amazon Lex V2 is HIPAA eligible and AWS describes it as PCI, SOC, and ISO compliant.Read 3 Oct 2026 · docs.aws.amazon.com
Speech and language
Lex provides automatic speech recognition and natural language understanding for voice and text chatbot interactions.Read 3 Oct 2026 · docs.aws.amazon.com
Transport security
Lex V2 clients must support TLS 1.0 or later, and AWS recommends TLS 1.2 or later.Read 3 Oct 2026 · docs.aws.amazon.com
Use cases
AWS lists self-service voice assistants, informational bots, transactional bots, enterprise productivity bots, and device-control bots as common use cases.Read 3 Oct 2026 · aws.amazon.com
Visual flow builder
YesRead 21 Sep 2026 · aws.amazon.com

Plans and prices

Text requests Free Pay only for what you use; each text input is counted as a text request. Request-and-response interaction pricing Read 21 Sep 2026 · aws.amazon.com
Speech requests Free Pay only for what you use; each speech input is counted as a speech request. Request-and-response interaction pricing Read 21 Sep 2026 · aws.amazon.com
Automated Chatbot Designer $0.50 a month The pricing page gives a charge of $0.50 per minute of training time. Transcript analysis and intent identification Read 21 Sep 2026 · aws.amazon.com
AWS Free Tier Free Free plan available for 6 months after account creation; new AWS customers receive up to $200 in AWS Free Tier credits Credits apply to eligible AWS services, including Amazon Lex · credits must be used within 12 months of account creation Read 3 Oct 2026 · aws.amazon.com
Speech request Free Per speech request in the pricing example Pay as you go · no upfront commitment or minimum fee Read 3 Oct 2026 · aws.amazon.com
Text request Free Per text request in the pricing example Pay as you go · no upfront commitment or minimum fee Read 3 Oct 2026 · aws.amazon.com
Automated chatbot designer $0.50, paid once Per minute of training time Analyzes conversation transcripts to identify intents Read 3 Oct 2026 · aws.amazon.com

Every Amazon Lex plan and price →

Strong points and limits

Strong points

  • Supports voice and text chatbot interactions.
  • Test Workbench supports test sets and performance review.
  • Bots can deploy across mobile and chat services.
  • Integrates with Lambda, Cognito, Polly, and Connect.
  • Free Tier is listed for six months after account creation.

Limits

  • Some language features are limited to particular locales.
  • Automated Chatbot Designer training time has a listed charge.
  • Free Tier credits must be used within 12 months.

Who it suits

It suits builders creating voice or chat interfaces for self-service, informational, transactional, productivity, or device-control use cases. It also fits teams deploying bots across mobile and chat channels or integrating with AWS services.

Verdict

Amazon Lex combines speech and language capabilities with bot design, testing, and deployment options. Its request pricing is pay-as-you-use, while Automated Chatbot Designer training time has a separate listed charge.

Where Specifiction places it

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