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Datumo

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No-code AI trust and safety evaluation platform. | Formerly known as SelectStar

Daejeon, South KoreaFounded 2018AI
Valuation $50–100M Last recorded · 2025
Revenue $1–10M Latest reported FY
Headcount 100–500 Current team size
Total funding $10–50M Disclosed equity funding
Unlock exact values This page shows ranges. Dealroom has the exact numbers for Datumo and the history behind them.

About Datumo

Selectstar.ai, a Seoul-based company founded in 2019 by Howook Shin and Seyeob Kim, operates a platform for AI training data solutions. Seyeob Kim, who serves as CEO, graduated from KAIST with a degree in electrical and electronic engineering. The company has secured significant funding, including a Series A round of $66.7 million in August 2022, bringing its total funding to $67 million from investors like Kakao Ventures and Company K Partners.

The core of Selectstar.ai's business is to address the challenge of acquiring high-quality data for AI development. It provides a comprehensive suite of services for collecting, labeling, and validating various data types, including images, text, and videos. The business operates on a B2B model, catering to AI companies and research labs that require large volumes of accurate training data. This is facilitated through its crowdsourcing platform, "Cashmission," which engages a large pool of workers to perform data collection and annotation tasks. This platform employs a three-step quality control process involving qualification tests, performance monitoring, and peer-review validation to ensure data accuracy.

The company's platform offers a range of features such as object and line segmentation, classification, transcription, and comparison tools for data labeling. A key technological advantage is its semi-automatic annotation technology, where deep learning models perform initial annotations that are then refined by human workers, reducing cost and time. Furthermore, Selectstar.ai has developed "Datumo Eval," a solution for verifying the reliability of large language models (LLMs) and has been involved in operating AI red team challenges to assess AI model stability. The company also offers an open dataset project, providing free access to datasets built in collaboration with AI companies to foster industry development.

Source: Dealroom company data

At a glance

Status
Operational
Founded
2018
Headquarters
Daejeon, South Korea
Employees
102
Open positions
1
Dealroom signal
89.0/100
Industry
Enterprise Software
Sector
AI, Core AI, Data Labeling, AI Applications, 4YFN 2025, 4YFN
Technology
Artificial Intelligence, Machine Learning, Deep Learning, Natural Language Processing, Computer Vision
Business model
Marketplace & ecommerce, SaaS
Client focus
b2b

Funding history

5 recorded events

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
SERIES B✓Equity / VC Aug 2025 $16M $62M Salesforce Ventures · SBI Investment · KB Investment · ACVC Ventures ↗
SERIES A✓Equity / VC Aug 2023 $3.4M $13M Korea Development Bank ↗
Showing the latest 2 of 5 recorded eventsBook a demo for the full funding history →

Financials

Revenue over time

Revenue, earnings and other financial measures where available. Years marked “E” are estimates.

YearRevenueGrowth
2026
2025
2024
2023
2022
2021 —
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Growth signals

Datumo website traffic

Latest recorded traffic for Datumo is 22K monthly website visits, down 15.4% over the last three months. Datumo's team grew 13.3% over the past year.

Latest monthly visits22K 3-month web change-15.4% 1-year team growth+13.3%
Summary metrics are public; monthly history is available with a demoCompare with peers →

Similar companies

Closest operating peers by Dealroom taxonomy

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Showing 8 of the closest matchesCompare every metric →

Investments and acquisitions

Capital deployed

Recent portfolio relationships for companies that also act as investors or acquirers.

Investors

10 investors on the cap table

From Dealroom's funding and investor records, grouped by the round each investor first entered.

Seed1 investor entered at this stage

Series A9 investors entered at this stage

  • Company K Partners
  • Kolon Investment
  • Now IB
  • CJ Investment
  • Korea Development Bank
  • Salesforce Ventures
  • SBI Investment
  • KB Investment
  • ACVC Ventures
Team profiled 5 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 2 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Global footprint

Workforce and web traffic by country
Workforce by country
2 countries with
team presence
🇰🇷 South Korea93.7%
🇺🇸 United States4.8%
2 countries shown

Market sentiment

Posts on X, past 7 days

An AI-synthesised read of the highest-engagement posts about Datumo on X, ranked by likes and reposts, corporate channels excluded.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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