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IBM Watson Assistant vs Amazon Lex

IBM Watson Assistant logo

IBM Watson Assistant

Software

IBM's enterprise AI platform for conversational experiences

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 IBM Watson Assistant has a free tier, so it costs nothing to try first.
  • Each has a real cost: IBM Watson Assistant listed on UK G-Cloud 14 at £112 per instance per month, submitted directly by IBM United Kingdom Limited for IBM watsonx Assistant; 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: IBM Watson Assistant covers NLU engine, Amazon Lex covers Speech recognition.

Where they differ

Only the attributes on which IBM Watson Assistant and Amazon Lex actually diverge.

Attributes where IBM Watson Assistant and Amazon Lex differ
AttributeIBM Watson AssistantAmazon Lex
Starting priceFree$0.00075/per text request
Pricing modelsubscriptionusage-based
Free tierYesNo
PlatformsWeb, Mobile, Messaging, Voice, Contact centersWeb, AWS Cloud
Founded19112006

Identical on both: 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 IBM Watson Assistant

  • NLU engine
  • Dialogue management
  • Integration with Watson services
  • Multi-language
  • Slack
  • Teams
  • Salesforce
  • SAP

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
  • Contact centers support

What people use each for

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

IBM Watson Assistant

  • 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 IBM Watson Assistant
  • Voice and text-based NLU applications requiring automatic speech recognitionnot IBM Watson Assistant
  • Custom conversational interfaces integrated into existing applicationsnot IBM Watson Assistant

Where each one falls short

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

IBM Watson Assistant

  • Listed on UK G-Cloud 14 at £112 per instance per month, submitted directly by IBM United Kingdom Limited for IBM watsonx Assistant

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

IBM Watson Assistant

Free
  • FreeFree
    • Basic chatbot
    • Limited interactions
  • Plus$140/month
    • Unlimited interactions
    • Advanced features
  • Enterprise$undefined/month
    • Full customization
    • Dedicated support

Amazon Lex

$0.00075/per text request

No published plan breakdown. See the Amazon Lex review.

Which should you pick?

Choose IBM Watson Assistant if

  • You need nlu engine.
  • You want to start without paying.
  • You work on Web, Mobile, Messaging, Voice, Contact centers.
  • You also want dialogue management.
IBM Watson Assistant 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 IBM Watson Assistant or Amazon Lex better?
Neither clearly leads. IBM Watson Assistant 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, IBM Watson Assistant or Amazon Lex?
IBM Watson Assistant has a free tier; the other does not. Paid plans start at Free for IBM Watson Assistant and $0.00075/per text request for Amazon Lex.
Does IBM Watson Assistant or Amazon Lex run on more platforms?
IBM Watson Assistant runs on Web, Mobile, Messaging, Voice, Contact centers. Amazon Lex runs on Web, AWS Cloud.
Can I use IBM Watson Assistant for free?
Yes. IBM Watson Assistant has a free tier, so you can try it without paying. Amazon Lex starts at $0.00075/per text request.
What is IBM Watson Assistant best used for?
IBM Watson Assistant 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 IBM Watson Assistant do that Amazon Lex cannot?
IBM Watson Assistant covers NLU engine, Dialogue management, Integration with Watson services, Multi-language. Amazon Lex covers Speech recognition, Natural language understanding, Voice and text, Lambda integration. Both handle Web support, Mobile support, Contact centers support.
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