Grepsi Security provides penetration testing, threat modelling, and open-source security tooling — helping teams find and fix vulnerabilities before attackers do.
Products & Services
Practical security work delivered by practitioners — from structured tooling to hands-on offensive engagements.
Browser-based STRIDE and LINDDUN threat modelling — 8-step OWASP-aligned workflow, interactive DFD, risk matrix, PDF export. Free and open-source, with no data ever leaving your browser.
Launch tool →Web application, API, and infrastructure penetration testing delivered against OWASP WSTG and PTES methodologies. Detailed, actionable reporting for development teams and executives.
Register interest →Published vulnerability research, CVE disclosures, and open-source tooling. Built in public — follow along as we ship.
Follow our work →Our approach
We think like attackers. Every engagement is driven by real threat intelligence, not checklists.
Our tooling is open-source, our methodology is documented, and our findings are yours to keep.
OWASP WSTG, PTES, NIST, and STRIDE/LINDDUN — rigorous methodology, every time.
Reports that development teams can actually act on — not 200-page documents with no clear next steps.
Get started
Start with our free threat modelling tool, or get in touch to discuss a penetration testing engagement.