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Amazon Lex vs Google Dialogflow

Amazon Lex logo

Amazon Lex

Live Chat

AWS conversational AI service

From
Free
Rated
-
Full reviewWebsite
Google Dialogflow logo

Google Dialogflow

Live Chat

Google's conversational AI platform

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); Google Dialogflow usage-based pricing expected but specific rates not confirmed
  • They diverge on capability: Amazon Lex covers Speech recognition, Google Dialogflow covers NLU and NLG.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Amazon Lex and Google Dialogflow actually diverge.

Attributes where Amazon Lex and Google Dialogflow differ
AttributeAmazon LexGoogle Dialogflow
PlatformsWeb, AWS CloudWeb, Mobile, Messaging apps, Voice assistants
Founded20061998

Identical on both: starting price (Free), pricing model (usage-based), 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 Google Dialogflow

  • NLU and NLG
  • Multi-language support
  • Integration with Google services
  • Webhooks
  • Google Cloud
  • 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 Google Dialogflow
  • Voice-based conversational AInot Google Dialogflow
  • Natural language understandingnot Google Dialogflow

Google Dialogflow

  • Customer engagementnot Amazon Lex
  • Lead generationnot Amazon Lex
  • Customer supportnot Amazon Lex
  • Sales automationnot 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

Google Dialogflow

  • Usage-based pricing expected but specific rates not confirmed
  • Free tier details not documented in available content

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

Google Dialogflow

Free
  • Free TierFree
    • 100 requests/day
    • Basic NLU
  • Standard$0.005/month
    • Pay per request
    • Advanced features
  • Enterprise$undefined/month
    • Custom SLAs
    • 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 Google Dialogflow if

  • You need nlu and nlg.
  • You want to start without paying.
  • You work on Web, Mobile, Messaging apps, Voice assistants.
  • You also want multi-language support.
Google Dialogflow review

Questions people ask

Is Amazon Lex or Google Dialogflow better?
Neither clearly leads. Amazon Lex starts at Free and Google Dialogflow at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Amazon Lex or Google Dialogflow?
Amazon Lex starts at Free and Google Dialogflow at Free.
Does Amazon Lex or Google Dialogflow run on more platforms?
Amazon Lex runs on Web, AWS Cloud. Google Dialogflow runs on Web, Mobile, Messaging apps, Voice assistants.
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 Google Dialogflow is typically brought in for.
What can Amazon Lex do that Google Dialogflow cannot?
Amazon Lex covers Speech recognition, Natural language understanding, Voice and text, Lambda integration. Google Dialogflow covers NLU and NLG, Multi-language support, Integration with Google services, Webhooks. 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
Google Dialogflow: How is Google Dialogflow priced?

Dialogflow uses usage-based pricing through Google Cloud. Costs vary based on the number of requests, interactions, or queries depending on the specific Dialogflow edition (Standard or Enterprise).

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
Google Dialogflow: Does Google Dialogflow offer a free tier?

Google Cloud typically provides free tier access for Dialogflow, but specific free quota limits depend on the Dialogflow edition and must be verified in the Google Cloud Console.

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
Google Dialogflow: What factors affect Dialogflow pricing beyond request volume?

Dialogflow pricing depends on request volume, concurrent users, AI model complexity, data processing volume, and additional features or third-party integrations used.

Source
Google Dialogflow: Where can I find exact Dialogflow pricing rates for my use case?

Exact per-query pricing and free tier limits are documented in the Google Cloud Console under Dialogflow billing. Regional pricing variations apply, and enterprise customers can contact Google Cloud sales.

Source
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