kitio.aiScale AI vs Sigma AI
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Scale AI starts at See pricing page and Sigma AI 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
- Managed data labeling
- RLHF and expert data
- Model evaluations
- Data Engine platform
- Public leaderboards
- Training data creation
- Independent model evaluation
- Human review operations
- 700+ languages
- Secure training sandboxes
| Feature | Scale AI | Sigma AI |
|---|---|---|
| Best for | Training data, evaluation and data labeling for frontier AI | Human-expert data, evaluation and review for AI teams |
| Category | Data & analytics | Data & analytics |
| Pricing model | Paid | Paid |
| Starting price | See pricing page | See pricing page |
| Free plan | No | No |
| Made by | Scale AI | Sigma AI |
| Based in | United States | Spain |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Scale AI starts at See pricing page and Sigma AI starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Scale AI
- Handles very large labeling projects
- Expert contributors for hard tasks
- Strong evaluation work
- Built for large contracts
- Some labs moved to rivals after Meta deal
Sigma AI
- Very wide language coverage
- Large pool of vetted experts
- Long track record in AI data
- No self-serve option
- No public pricing
- Aimed at companies building models
Which one should you choose?
Choose Scale AI if you want:
- Handles very large labeling projects
- Expert contributors for hard tasks
- Strong evaluation work
Watch out: built for large contracts.
Choose Sigma AI if you want:
- Very wide language coverage
- Large pool of vetted experts
- Long track record in AI data
Watch out: no self-serve option.
Scale AI vs Sigma AI FAQ
What is the difference between Scale AI and Sigma AI?
Scale AI: Training data, evaluation and data labeling for frontier AI. Sigma AI: Human-expert data, evaluation and review for AI teams. Both are data & analytics tools.
Is Scale AI or Sigma AI cheaper?
Scale AI starts at See pricing page and Sigma AI starts at See pricing page. Check both pricing pages for current plans.
Do Scale AI and Sigma AI have free plans?
Scale AI: No. Sigma AI: No.
Who makes Scale AI?
Scale AI is made by Scale AI, based in United States.
Who makes Sigma AI?
Sigma AI is made by Sigma AI, based in Spain.
Which should I choose, Scale AI or Sigma AI?
Choose Scale AI if you value handles very large labeling projects and expert contributors for hard tasks. Choose Sigma AI if you value very wide language coverage and large pool of vetted experts.