kitio.aiAmazon Comprehend vs IBM Watson Discovery
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Amazon Comprehend starts at See pricing page and IBM Watson Discovery starts at See pricing page. Check both pricing pages for current plans.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Entity and key phrase extraction
- Sentiment analysis
- Custom classification
- Custom entity recognition
- Topic modeling
- Smart Document Understanding
- NLP enrichments
- Custom entity extraction
- OCR for images of text
- Faceted search
- JSON output
| Feature | Amazon Comprehend | IBM Watson Discovery |
|---|---|---|
| Best for | AWS natural language API for entities, sentiment and classification | Enterprise document understanding and search with NLP enrichments |
| Category | Data & analytics | Data & analytics |
| Pricing model | Freemium | Free trial |
| Starting price | See pricing page | See pricing page |
| Free plan | Yes | No, trial available |
| Made by | Amazon Web Services | IBM |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
|
Pricing compared
Amazon Comprehend starts at See pricing page and IBM Watson Discovery starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Free Tier
Free
- 50K units of text per API monthly
- First 12 months only
Standard APIs
$0.0001 / unit (100 characters)
- Entities, sentiment, key phrases
- Volume discounts at scale
Custom models
$3 / training hour
- Endpoint inference billed per second
- Monthly model storage fee
Prices in USD, checked Nov 5, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Amazon Comprehend
- No ML expertise needed for basic APIs
- Custom models on your own labels
- Scales with other AWS services
- Free tier lasts only 12 months
- Custom models have no free tier
- Costs can be hard to estimate
IBM Watson Discovery
- Learns document layouts from a few labelled pages
- Strong entity and concept extraction
- Handles low-quality scans
- Enterprise pricing not listed on the page
- Setup suits technical teams
- Tied to IBM Cloud
Which one should you choose?
Choose Amazon Comprehend if you want:
- No ML expertise needed for basic APIs
- Custom models on your own labels
- Scales with other AWS services
Watch out: free tier lasts only 12 months.
Choose IBM Watson Discovery if you want:
- Learns document layouts from a few labelled pages
- Strong entity and concept extraction
- Handles low-quality scans
Watch out: enterprise pricing not listed on the page.
Amazon Comprehend vs IBM Watson Discovery FAQ
What is the difference between Amazon Comprehend and IBM Watson Discovery?
Amazon Comprehend: AWS natural language API for entities, sentiment and classification. IBM Watson Discovery: Enterprise document understanding and search with NLP enrichments. Both are data & analytics tools.
Is Amazon Comprehend or IBM Watson Discovery cheaper?
Amazon Comprehend starts at See pricing page and IBM Watson Discovery starts at See pricing page. Check both pricing pages for current plans.
Do Amazon Comprehend and IBM Watson Discovery have free plans?
Amazon Comprehend: Yes. IBM Watson Discovery: No, trial available.
Who makes Amazon Comprehend?
Amazon Comprehend is made by Amazon Web Services, based in United States.
Who makes IBM Watson Discovery?
IBM Watson Discovery is made by IBM, based in United States.
Which should I choose, Amazon Comprehend or IBM Watson Discovery?
Choose Amazon Comprehend if you value no ml expertise needed for basic apis and custom models on your own labels. Choose IBM Watson Discovery if you value learns document layouts from a few labelled pages and strong entity and concept extraction.