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Google Dialogflow vs Amazon Lex

Google Dialogflow logo

Google Dialogflow

Software

Google's conversational AI platform

From
Free
Rated
-
Full reviewWebsite
Amazon Lex logo

Amazon Lex

Software

AWS conversational AI service

From
$0.00075/per text request
Rated
-
Full reviewWebsite

The short version

  • Only Google Dialogflow has a free tier, so it costs nothing to try first.
  • Each has a real cost: Google Dialogflow google's own Dialogflow pricing page (cloud.google.com/dialogflow/pricing) prices Conversational Agents (CX) text requests at $0.007 per request, audio input at $0.0065 per 15 seconds and audio output from $4 per 1 million characters, all in USD, with a one-time $600 free credit for the first 12 months; Dialogflow ES (Essentials) is billed per request separately from CX and the two are not interchangeable, so a chatbot built on ES cannot simply switch to CX pricing without migration.; Amazon Lex pay-as-you-go model with no standard free tier, only AWS free credits for new customers (6 months, $200 limit)
  • They diverge on capability: Google Dialogflow covers NLU and NLG, Amazon Lex covers Speech recognition.

Where they differ

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

Attributes where Google Dialogflow and Amazon Lex differ
AttributeGoogle DialogflowAmazon Lex
Starting priceFree$0.00075/per text request
Free tierYesNo
PlatformsWeb, Mobile, Messaging apps, Voice assistantsWeb, AWS Cloud
Founded19982006

Identical on both: pricing model (usage-based), user rating (Not yet rated), category (Unknown).

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 Google Dialogflow

  • NLU and NLG
  • Multi-language support
  • Integration with Google services
  • Webhooks
  • Google Cloud
  • Slack
  • Facebook
  • Telegram

Only in Amazon Lex

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

Both cover

  • Web support
  • Mobile support

What people use each for

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

Google Dialogflow

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

Amazon Lex

  • Building conversational chatbots leveraging Alexa deep learning enginenot Google Dialogflow
  • Voice and text-based NLU applications requiring automatic speech recognitionnot Google Dialogflow
  • Custom conversational interfaces integrated into existing applicationsnot Google Dialogflow

Where each one falls short

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

Google Dialogflow

  • Google's own Dialogflow pricing page (cloud.google.com/dialogflow/pricing) prices Conversational Agents (CX) text requests at $0.007 per request, audio input at $0.0065 per 15 seconds and audio output from $4 per 1 million characters, all in USD, with a one-time $600 free credit for the first 12 months; Dialogflow ES (Essentials) is billed per request separately from CX and the two are not interchangeable, so a chatbot built on ES cannot simply switch to CX pricing without migration.

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

Pricing, plan by plan

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

Amazon Lex

$0.00075/per text request

No published plan breakdown. See the Amazon Lex review.

Which should you pick?

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

Choose Amazon Lex if

  • You need speech recognition.
  • You work on Web, AWS Cloud.
  • You also want natural language understanding.
Amazon Lex review

Questions people ask

Is Google Dialogflow or Amazon Lex better?
Neither clearly leads. Google Dialogflow starts at Free and Amazon Lex at $0.00075/per text request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Google Dialogflow or Amazon Lex?
Google Dialogflow has a free tier; the other does not. Paid plans start at Free for Google Dialogflow and $0.00075/per text request for Amazon Lex.
Does Google Dialogflow or Amazon Lex run on more platforms?
Google Dialogflow runs on Web, Mobile, Messaging apps, Voice assistants. Amazon Lex runs on Web, AWS Cloud.
Can I use Google Dialogflow for free?
Yes. Google Dialogflow has a free tier, so you can try it without paying. Amazon Lex starts at $0.00075/per text request.
What is Google Dialogflow best used for?
Google Dialogflow is most often used for customer engagement, lead generation, customer support, sales automation. Of those, customer engagement and lead generation are not what Amazon Lex is typically brought in for.
What can Google Dialogflow do that Amazon Lex cannot?
Google Dialogflow covers NLU and NLG, Multi-language support, Integration with Google services, Webhooks. Amazon Lex covers Speech recognition, Natural language understanding, Voice and text, Lambda integration. Both handle Web support, Mobile support.
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Related pages

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