Plainsea

Platform for managing and delivering penetration testing engagements.

Plainsea streamlines how pentest providers and internal teams run engagements, covering scoping, delivery, reporting, and client collaboration in one workspace. Based in Sofia and spun out of security services firm AMATAS, it was founded in 2022.

Category: Pentesting & Offensive Security
Founded: 2022
Funding: Backed by Ocean Investments (AMATAS spinout)
Website: https://plainsea.com

Seen at Black Hat USA 2026 (Startup City sponsor, booth 5916).

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