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Amazon Lex vs Microsoft Bot Framework

Amazon Lex logo

Amazon Lex

Live Chat

AWS conversational AI service

From
Free
Rated
-
Full reviewWebsite
Microsoft Bot Framework logo

Microsoft Bot Framework

Live Chat

Microsoft's framework for building intelligent bots

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Amazon Lex pay-as-you-go model with no standard free tier, only AWS free credits for new customers (6 months, $200 limit); Microsoft Bot Framework no pricing information published on official product pages
  • They diverge on capability: Amazon Lex covers Speech recognition, Microsoft Bot Framework covers Bot Builder.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Amazon Lex and Microsoft Bot Framework actually diverge.

Attributes where Amazon Lex and Microsoft Bot Framework differ
AttributeAmazon LexMicrosoft Bot Framework
Pricing modelusage-basedfreemium
PlatformsWeb, AWS CloudWeb, Mobile, Messaging apps, Voice
Founded20061975

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Live Chat).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Amazon Lex

  • Speech recognition
  • Natural language understanding
  • Voice and text
  • Lambda integration
  • AWS services
  • Lambda
  • DynamoDB
  • SNS

Only in Microsoft Bot Framework

  • Bot Builder
  • Language Understanding (LUIS)
  • QnA Maker
  • Multi-channel support
  • Teams
  • Slack
  • Facebook
  • Telegram

Both cover

  • Web support
  • Mobile support

What people use each for

The jobs each tool is most often brought in to do.

Amazon Lex

  • Chatbot developmentnot Microsoft Bot Framework
  • Voice-based conversational AInot Microsoft Bot Framework
  • Natural language understandingnot Microsoft Bot Framework

Microsoft Bot Framework

  • Chatbot development and deploymentnot Amazon Lex
  • Conversational AI applicationsnot Amazon Lex
  • Microsoft Teams bot integrationnot Amazon Lex
  • Multi-channel bot deploymentnot Amazon Lex

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Amazon Lex

  • Pay-as-you-go model with no standard free tier, only AWS free credits for new customers (6 months, $200 limit)
  • Speech requests cost $0.004 each, text requests $0.00075 each, training costs $0.50 per minute
  • Variable costs can accumulate quickly for high-volume applications

Microsoft Bot Framework

  • No pricing information published on official product pages
  • Pricing likely depends on underlying Azure services used
  • Customers directed to Azure pricing calculator for cost estimation

Pricing, plan by plan

Amazon Lex

Free
  • Standard Usage$0.004/per speech request
    • Speech requests at $0.004 each
  • Text Requests$0.00075/per text request
    • Text requests at $0.00075 each

Microsoft Bot Framework

Free
  • FreeFree
    • Bot Framework SDK
    • Azure Bot Service basic
  • Standard$0.5/month
    • Advanced connectors
    • Premium support
  • Premium$undefined/month
    • Enterprise features
    • Dedicated support

Which should you pick?

Choose Amazon Lex if

  • You need speech recognition.
  • You want to start without paying.
  • You work on Web, AWS Cloud.
  • You also want natural language understanding.
Amazon Lex review

Choose Microsoft Bot Framework if

  • You need bot builder.
  • You want to start without paying.
  • You work on Web, Mobile, Messaging apps, Voice.
  • You also want language understanding (luis).
Microsoft Bot Framework review

Questions people ask

Is Amazon Lex or Microsoft Bot Framework better?
Neither clearly leads. Amazon Lex starts at Free and Microsoft Bot Framework at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Amazon Lex or Microsoft Bot Framework?
Amazon Lex starts at Free and Microsoft Bot Framework at Free.
Does Amazon Lex or Microsoft Bot Framework run on more platforms?
Amazon Lex runs on Web, AWS Cloud. Microsoft Bot Framework runs on Web, Mobile, Messaging apps, Voice.
Can I use Amazon Lex for free?
Both have a free tier, so you can try either at no cost before committing.
What is Amazon Lex best used for?
Amazon Lex is most often used for chatbot development, voice-based conversational ai, natural language understanding. Of those, chatbot development and voice-based conversational ai are not what Microsoft Bot Framework is typically brought in for.
What can Amazon Lex do that Microsoft Bot Framework cannot?
Amazon Lex covers Speech recognition, Natural language understanding, Voice and text, Lambda integration. Microsoft Bot Framework covers Bot Builder, Language Understanding (LUIS), QnA Maker, Multi-channel support. Both handle Web support, Mobile support.

Answered from the vendors’ own pages

Amazon Lex: How much does Amazon Lex cost?

Amazon Lex charges $0.004 per speech request and $0.00075 per text request with no upfront commitments or minimum fees required.

Source
Microsoft Bot Framework: How much does Microsoft Bot Framework cost?

Microsoft Bot Framework itself has no published pricing. Costs depend on the Azure services used to host and run bots, which are billed through Azure consumption-based pricing for compute, storage, and other resources required.

Source
Amazon Lex: Is there a free tier for Amazon Lex?

Yes, new AWS customers receive 10,000 text requests and 5,000 speech requests per month free for the first year. Additional $200 in AWS Free Tier credits are available for new customers as of July 15, 2025, with all credits expiring within 12 months.

Source
Microsoft Bot Framework: How do I estimate Microsoft Bot Framework costs?

Use the Azure Pricing Calculator to estimate costs based on your bot's compute, storage, and messaging requirements. Costs scale based on bot traffic, deployment region, and storage needs for conversation data.

Source
Amazon Lex: What is the example monthly cost for Amazon Lex?

For 8,000 speech requests ($32) and 2,000 text requests ($1.50), the approximate monthly total is $33.50, though actual costs vary based on usage volume.

Source
Microsoft Bot Framework: Are there any free tiers for Microsoft Bot Framework?

Microsoft Bot Framework itself is free to develop and deploy, but hosting and operating bots incurs Azure service costs that vary based on usage patterns and selected Azure services.

Source
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