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Amazon Lex vs Yellow.ai

Amazon Lex logo

Amazon Lex

Live Chat

AWS conversational AI service

From
Free
Rated
-
Full reviewWebsite
Yellow.ai logo

Yellow.ai

Live Chat

Enterprise AI platform for customer experience

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Amazon Lex 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); Yellow.ai free plan caps chat sessions at 500 per month, then charges $0.99 per additional resolution
  • They diverge on capability: Amazon Lex covers Speech recognition, Yellow.ai covers AI chatbots.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Amazon Lex and Yellow.ai actually diverge.

Attributes where Amazon Lex and Yellow.ai differ
AttributeAmazon LexYellow.ai
Starting priceFreeOn request
Pricing modelusage-basedsubscription
Free tierYesNo
PlatformsWeb, AWS CloudWeb, Mobile, Messaging apps, Voice assistants
Founded20062016

Identical on both: 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 Yellow.ai

  • AI chatbots
  • NLU capabilities
  • Multi-channel support
  • Analytics dashboard
  • Zendesk
  • Salesforce
  • HubSpot
  • Slack

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 Yellow.ai
  • Voice-based conversational AInot Yellow.ai
  • Natural language understandingnot Yellow.ai

Yellow.ai

  • Businesses wanting to trial an AI chat agent before committing to per-resolution or enterprise billingnot 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

Yellow.ai

  • Free plan caps chat sessions at 500 per month, then charges $0.99 per additional resolution
  • Enterprise plan pricing is not published and requires contacting sales for a custom quote
  • Basic plan pricing is not disclosed on the pricing page either, only feature details

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

Yellow.ai

On request
  • Starter$150/month
    • AI chatbot
    • 1 integration
  • Professional$400/month
    • Multi-channel
    • Advanced analytics
  • Enterprise$undefined/month
    • Custom solutions
    • Dedicated team

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 Yellow.ai if

  • You need ai chatbots.
  • You work on Web, Mobile, Messaging apps, Voice assistants.
  • You also want nlu capabilities.
Yellow.ai review

Questions people ask

Is Amazon Lex or Yellow.ai better?
Neither clearly leads. Amazon Lex starts at Free and Yellow.ai at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Amazon Lex or Yellow.ai?
Amazon Lex has a free tier; the other does not. Paid plans start at Free for Amazon Lex and On request for Yellow.ai.
Does Amazon Lex or Yellow.ai run on more platforms?
Amazon Lex runs on Web, AWS Cloud. Yellow.ai runs on Web, Mobile, Messaging apps, Voice assistants.
Can I use Amazon Lex for free?
Yes. Amazon Lex has a free tier, so you can try it without paying. Yellow.ai starts at On request.
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 Yellow.ai is typically brought in for.
What can Amazon Lex do that Yellow.ai cannot?
Amazon Lex covers Speech recognition, Natural language understanding, Voice and text, Lambda integration. Yellow.ai covers AI chatbots, NLU capabilities, Multi-channel support, Analytics dashboard. 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
Yellow.ai: What does Yellow.ai's free tier include?

The free plan includes 1 AI agent, 500 monthly chat sessions with overage at $0.99 per additional resolution, and limited features.

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
Yellow.ai: What compliance certifications does the Enterprise plan provide?

The Enterprise tier includes SOC2, GDPR, and ISO compliance standards, ensuring enterprise-grade security and data handling.

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
Yellow.ai: How many agents and channels can I deploy with Yellow.ai's paid plans?

The Basic plan allows expandable agents and channels with 1,000 user records, while the Enterprise plan offers unlimited agents, sessions, and access to 35+ channels.

Source
Yellow.ai: How do I find out Enterprise pricing for Yellow.ai?

The Enterprise plan pricing is not listed publicly and requires contacting the sales team for a custom quote.

Source
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