Most organizations say they aren’t fully prepared to use generative AI in a safe and responsible way, according to a recent McKinsey report. One concern is explainability — understanding how and why AI makes certain decisions. While 40% of respondents view it as a significant risk, only 17% are actively addressing it, per the report.

Seoul-based Datumo began as an AI data labeling company and now wants to help businesses build safer AI with tools and data that enable testing, monitoring, and improving their models — without requiring technical expertise. On Monday the startup raised $15.5 million, which brings its total raised to approximately $28 million, from investors including Salesforce Ventures, KB Investment, ACVC Partners, and SBI Investment, among others.

David Kim, CEO of Datumo and a former AI researcher at Korea’s Agency for Defense Development, was frustrated by the time-consuming nature of data labeling so he came up with a new idea: a reward-based app that lets anyone label data in their spare time and earn money. The startup validated the idea at a startup competition at KAIST (Korea Advanced Institute of Science and Technology). Kim co-founded Datumo, formerly known as SelectStar, alongside five KAIST alumni in 2018.

Even before the app was fully built, Datumo secured tens of thousands of dollars in pre-contract sales during the customer discovery phase of the competition, mostly from KAIST alumni-led businesses and startups.

In its first year, the startup surpassed $1 million in revenue and secured several key contracts. Today, the startup counts major Korean companies like Samsung, Samsung SDS, LG Electronics, LG CNS, Hyundai, Naver, and Seoul-based telecom giant SK Telecom among its clients. Several years ago, however, clients began asking the company to go beyond simple data labeling. The 7-year-old startup now has more than 300 clients in South Korea and generated about $6 million in revenue in 2024.

“They wanted us to score their AI model outputs or compare them to other outputs,” Michael Hwang, co-founder of Datumo, told TechCrunch. “That’s when we realized: We were already doing AI model evaluation — without even knowing it.” Datumo doubled down on this area and released Korea’s first benchmark dataset focused on AI trust and safety, Hwang added.

“We started in data annotation, then expanded into pretraining datasets and evaluation as the LLM ecosystem matured,” Kim told TechCrunch.

Meta’s recent $14.3 billion acquisition-like investment in data-labeling company Scale AI highlights the importance of this market. Shortly after that deal, AI model maker and Meta competitor OpenAI stopped using Scale AI’s services. The Meta deal also signals that competition for AI training data is intensifying.

Datumo shares some similarities with companies like Scale AI in pretraining dataset provisioning, and with Galileo and Arize AI in AI evaluation and monitoring. However, it differentiates itself through its licensed datasets, particularly data crawled from published books, which the company says offers rich structured human reasoning but is notoriously difficult to clean, according to CEO Kim.

Unlike its peers, Datumo also offers a full-stack evaluation platform called Datumo Eval, which automatically generates test data and evaluations to check for unsafe, biased or incorrect responses without the need for manual scripting, Kim added. The signature product is a no-code evaluation tool designed for non-developers like those on policy, trust and safety, and compliance teams.

When asked about attracting investors like Salesforce Ventures, Kim explained that the startup had previously hosted a fireside chat with Andrew Ng, founder of DeepLearning.AI, at an event in South Korea. After the event, Kim shared the session on LinkedIn, which caught the attention of Salesforce Ventures. Following several meetings and Zoom calls, the investors extended a soft commitment. The entire funding process took about eight months, Hwang said.

The new funding will be used to accelerate R&D efforts, particularly in developing automated evaluation tools for enterprise AI, and to scale global go-to-market operations across South Korea, Japan, and the U.S. The startup, which has 150 employees in Seoul, also established a presence in Silicon Valley in March.

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