Expert Cyber Security. Real-World Protection. Trusted Certification.

At ONSec, we specialise in delivering practical, high-impact cyber security services to businesses across the UK and beyond. Whether you're a growing business seeking Cyber Essentials certification or in need of advanced penetration testing, we provide the clarity, confidence, and expertise you need to stay secure.

Who We Are

ONSec was founded on the principle that cyber security should be straightforward, effective, and accessible not overwhelming or overpriced. Our team of certified professionals brings hands-on experience from real-world projects, including:

Accredited penetration testers
IASME-certified Cyber Essentials & Cyber Assurance assessors
Specialists in cloud, infrastructure, mobile, API, and WiFi security testing

We’re proud to hold IASME Cyber Assurance Level Two, the highest level of certification, independently audited and aligned with GDPR and UK data protection standards.

What We Do

We provide a comprehensive suite of cyber security services, including:

Cyber Essentials & Cyber Essentials Plus certification
Infrastructure & web application penetration testing
API, mobile, and WiFi security testing
Cloud security assessments (AWS, Azure, and more)
Security awareness and social engineering testing
Managed Detection & Response (MDR) services

Whether it’s a one-off test or a fully managed security solution, we tailor our services to fit your goals, budget, and compliance needs.

Why Choose ONSec?

Trusted Certifications – We’re authorised assessors for Cyber Essentials and IASME Cyber Assurance
Clear Guidance – We work with you before and during assessments to make the process hassle free
Proactive Protection – We don’t wait for threats to happen we find the gaps before attackers do
Expertise You Can Rely On – Our team uses the same tools and tactics as real-world attackers, giving you true insight into your risks
Cost-Effective Packages – We believe cyber security should be achievable for all businesses, not just the largest ones

Our Mission

To make cyber security accessible, understandable, and effective for every business we work with by delivering expert led, value-driven, industry standard services that actually make a difference to your business.