Frequently Asked Questions

Sigma was founded by Daniel Tapias and Nuria Gomez Bermejo in 2008 in Madrid, Spain.

Sigma is headquartered in ​​San Francisco, USA at 165 10th Street; Suite #300. San Francisco, CA 94103
Our European office is in Madrid, Spain at Avenida de Burgos, 114; First Floor Madrid, Spain 28050

Open positions are listed on our Careers page. Please submit your resume or CV!

Yes! Please contact us if you are interested in partnering.

Sigma.AI is a global training data collection, preparation, and annotation services company. We solve one of the biggest problems in AI;  high quality, accurate training data. Get to know our services and annotation platform.  Explore use cases

Sigma supports audio, image, video and text annotation.

Sigma supports over 250 languages and dialects. Please contact us with your specific needs. We are continually adding to the languages we serve.

We are flexible in what tools are used for annotation. Our proprietary annotation platform can be configured to your needs or we can use your tool of choice.

We use two pricing models: hourly based and unit based. The model is driven by client preferences and type of data annotation.

The larger the volume of data the lower the cost. There are fixed costs that are common to all projects. If the quantity of data is large, then the impact of the fixed cost is lower and the cost per hour of work or per unit is lower too. If the volume of data is large, the labelers, the QA team, the project managers and other related personnel have time to reach the production peak and to maintain it.

The number of tasks reduces costs because larger quantities of data reduce some fixed costs, allows us to reuse workflows and experience in the type of data, simplifies communication with clients, and allows us to optimize the performance and quality of labelers through different strategies such as balancing their cognitive load.

Yes. Please contact us if you would like to participate or learn more.

During the free trial we work on a small subset of your data to understand your data, demonstrate the quality of our work and align expectations, especially annotation guidelines. Typically, a free trial is limited to about 10 hours of work.

Sigma is GDPR, CCPS/CPRA and ISO27001 compliant and can do work remotely, in Sigma’s office or in Sigma’s secure facilities with security guards and stringent security measures, allowing Sigma to adapt security requirements to your needs.

Data can be annotated at a clients’ offices, remotely, or in Sigma’s secure facilities.

Data can be stored on Sigma’s servers (located in Madrid), on the client’s servers, or in the cloud at a location of your choice. Whatever makes more sense depending on client’s practices and needs, as well as on the confidentiality and privacy of the data.

Sigma is 100% GDPR compliant. All sensitive data is annotated in our secure facilities.

Sigma is ISO27001 certified. All sensitive data is annotated in our secure facilities.

Sigma is currently seeking SOC 2, Type 2 compliance.