Cobalt Security

The problem

Nine in ten security breaches start with a staff member clicking a link, and yearly training videos change nobody's behaviour.

The solution

Cobalt Security sends each person realistic practice attacks based on their role and teaches them in the moment, in under a minute.

Who it's for

IT and security leads at companies with 50–2,000 staff.

Market

Bottom-up: about 75,000 customers like this in Estonia and nearby, worth roughly $200 million a year at our prices.

Competition and edge

Headline metric

8,900 active users, growing 11% a month

The team

Kristjan knows the customer and has sold to them before; Liis has built this kind of system at scale. We have worked side by side since before Cobalt Security had a name.

Worked together

6–12 months

Hiring

A senior engineer and our first customer-success hire.

About the founder

Kristjan Tamm

Founder & CEO · Tallinn, Estonia · 10 years of experience

Kristjan led incident response at a bank and investigated more than 200 breaches. Started Cobalt Security in 2025 and works on it full-time from Tallinn.

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