Plainsea
Bulgarian AI penetration-testing platform that runs continuous, human-approved attack testing and delivers evidence-backed findings.
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Plainsea is a Sofia, Bulgaria company whose platform automates penetration testing. It combines an offensive-security delivery foundation, with standard methodology and reporting, and AI agents that attack applications and infrastructure within a scope the customer sets, asking for approval before critical steps and attaching audit-ready evidence to each confirmed finding.
The company grew out of a managed security services and CREST-accredited pentesting background; its CEO, Marko Simeonov, says traditional annual testing is expensive and leaves gaps between tests. Plainsea announced expansion into the UK and US markets in 2025 and states that it holds SOC 2 Type II and ISO/IEC 27001 certifications.
Innovation Matrix Assessment
Moved from a pentest delivery platform to agentic, continuous testing, with a product launch at Infosecurity Europe and 2025 market expansion.
Continuous, scoped testing with human approval and audit-ready evidence addresses the gap between annual tests, and suits MSSPs and security teams with limited expert time.
Trade-press interviews and a UK and US expansion announcement exist; no named customers, funding or analyst placements were found.
AI-driven pentesting is an active category with many entrants; keeping a human in control of critical steps is a sensible but not unique approach.
Findings are described as confirmed with evidence, but no independent test results or named customer outcomes were found.
Continuous validation of exposure should stay relevant as software changes faster and AI-generated code spreads.
Why CISOs Should Care
Offers a way to test applications and infrastructure continuously instead of once a year, with findings confirmed and evidenced before they reach the team.
What Makes It Different
Plainsea pairs AI attack agents with a practitioner-built pentest methodology and customer approval for critical steps.
The Matrix Verdict
52/100 — INCREMENTAL INNOVATOR
Plainsea is a credible, practitioner-rooted entrant in AI-driven penetration testing with steady trade-press visibility. It lands in the Incremental Innovator tier on a solid product story, held back by limited customer and independent evidence.
Editorial Note: Claims vs. Verified Findings
Certifications, the CREST background and capability claims come from the company website and are unverified vendor claims. The 2022 founding year comes from a directory listing and was not confirmed by the company; funding and size were not found.
Sources
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