Sigma AI
Sigma AI (founded 2008, Madrid) is a long-established global data-collection, preparation, and annotation company. It labels speech, text, image, and video data for AI training and supports over 500 languages and dialects, with offices in Madrid, Miami, and London.
Details
Task Types
✅ Pros
One of the longer-established, stable annotation firms with broad multilingual capability.
⚠️ Cons
Contributor pay rates and payment methods are not publicly disclosed; operates as a managed-services vendor rather than an open marketplace.
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FAQ
- Is Sigma AI legit?
- Yes. Sigma AI is legit - founded in 2008, with a 15+ year track record, offices on three continents (Madrid, Miami, London), and an established reputation in data annotation. The main gap is a lack of public detail on contributor compensation.
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