Sigma AI

What is Sigma AI?

Sigma AI is a services company that provides training data, annotation and evaluation for AI systems, with human experts supervising the work. It was founded in 2008 in Madrid and describes four offerings: AI data foundations, model and agentic evaluation, human-in-the-loop operations, and AI solutions and advisory. Annotation covers audio, images, video and text across hundreds of languages and dialects, using either its own configurable annotation platform or a tool the client prefers. The company positions itself as independent because it does not build frontier models or agent products, so it has no stake in the systems it evaluates. It lists ISO 27001, SOC 2 Type II and GDPR compliance. Pricing is by the hour or by the unit depending on the client and the type of annotation, and a free pilot is described, so teams request a quote.

Use cases

• Label audio, image, video and text data
• Evaluate models and agents independently
• Add human review to agent workflows
• Collect multilingual training data
• Test GenAI quality with expert rubrics
• Prepare for AI compliance reviews

Who it's for

• AI labs
• AI product teams
• Regulated industries
• Enterprise AI teams

Why use Sigma AI

• Adds human judgment to training data and evaluation instead of relying on benchmarks alone.
• Evaluation comes from a vendor that does not build competing models or agents.
• Works with the annotation tool the client already uses if needed.
• A free pilot is described for testing quality before a larger commitment.

Sigma AI features

• Annotation for audio, images, video and text
• Coverage of hundreds of languages and dialects
• Configurable annotation platform or the client's own tool
• AI model and agentic evaluation
• Human-in-the-loop operations for agent stacks
• Calibrated expert annotators and agreement monitoring
• AI solutions and advisory
• ISO 27001, SOC 2 Type II and GDPR compliance

How to get started with Sigma AI

1. Contact the team to describe the data or evaluation need.
2. Agree on the annotation approach, tooling and pricing model, by the hour or by the unit.
3. Run a pilot to check quality and working procedures.
4. Scale the project with expert annotators, quality checks and reporting.

Sigma AI limitations

• Pricing is by quote, charged by the hour or by the unit
• Delivered as a managed service rather than self-serve software

Sigma AI pricing

Sigma AI is sold on custom quotes, so its prices aren't published.

Prices can change and may vary by country or exclude tax. Check the official pricing page.

Sigma AI alternatives

The main Sigma AI alternatives listed on Debuly are Crowdworks AI, CVAT, Encord, Label Studio, Agent Development Kit (ADK) and Argilla. The table compares pricing and platforms; order is A–Z.

1. 

   Agent Development Kit (ADK)

   Google's open-source, code-first Python framework for building, testing and deploying AI agents and multi-agent workflows.

   Developer platformsAutomation and agentsCoding
   Open sourceVisit Agent Development Kit (ADK) (official site)
2. 

   Argilla

   Open-source data curation platform where AI engineers and domain experts collect human and AI feedback to improve LLM datasets.

   Developer platformsAutomation and agents
   Open sourceVisit Argilla (official site)
3. 

   Crowdworks AI

   AI data labeling platform and managed labeling service, plus enterprise tools for building and evaluating AI agents.

   Developer platformsAutomation and agents
   Contact salesVisit Crowdworks AI (official site)
4. 

   CVAT

   Open-source annotation platform for labeling images, video, audio and 3D data, available hosted or self-hosted.

   Developer platformsAutomation and agents
   FreemiumVisit CVAT (official site)
5. 

   Encord

   Multimodal data platform for AI teams to curate, annotate and evaluate image, video, DICOM, audio, document and text data.

   Developer platformsAutomation and agentsResearch and search
   Contact salesVisit Encord (official site)
6. 

   Label Studio

   Open source data labeling platform for images, video, audio, text and time series, with paid Starter Cloud and Enterprise editions.

   Developer platformsAutomation and agents
   Open sourceVisit Label Studio (official site)

Sigma AI FAQ

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

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