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Live Chat & Chatbots · head to head

Amazon Lex vs Google Dialogflow

Amazon Lex logo

Amazon Lex

Live Chat & Chatbots

AWS conversational AI service

From
$0.00075/per text request
Rated
-
Full reviewWebsite
Google Dialogflow logo

Google Dialogflow

Live Chat & Chatbots

Google's conversational AI platform

From
Free
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: 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 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.
  • They diverge on capability: Amazon Lex covers Speech recognition, Google Dialogflow covers NLU and NLG.

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
Starting price$0.00075/per text requestFree
Free tierNoYes
PlatformsWeb, AWS CloudWeb, Mobile, Messaging apps, Voice assistants
Founded20061998

Identical on both: pricing model (usage-based), user rating (Not yet rated), category (Live Chat & Chatbots).

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

  • 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

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

  • 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.

Pricing, plan by plan

Amazon Lex

$0.00075/per text request

No published plan breakdown. See the Amazon Lex review.

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 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 $0.00075/per text request 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?
Google Dialogflow has a free tier; the other does not. Paid plans start at $0.00075/per text request for Amazon Lex and Free for Google Dialogflow.
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 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 Amazon Lex best used for?
Amazon Lex is most often used for building conversational chatbots leveraging alexa deep learning engine, voice and text-based nlu applications requiring automatic speech recognition, custom conversational interfaces integrated into existing applications. Of those, building conversational chatbots leveraging alexa deep learning engine and voice and text-based nlu applications requiring automatic speech recognition 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.
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