OnSecurity

OnSecurity is a fast-growing CREST-accredited penetration testing vendor founded in 2018 and headquartered in Bristol, England. The company has built a technology-first platform that allows clients to quote, schedule, and book penetration tests in under 60 seconds, combining the speed and efficiency of SaaS-based delivery with the rigour of expert human-led testing. With over 400 customers globally and a team of approximately 50 to 60 employees, OnSecurity has established itself as one of the most innovative and accessible penetration testing providers in the UK market.

OnSecurity's core platform combines AI-augmented penetration testing with traditional manual assessment, providing faster and more accurate results without compromising quality. Their services cover web application testing, mobile application testing, network and infrastructure assessments, cloud security testing, wireless penetration testing, and IoT device evaluations. All test methodologies, processes, policies, and procedures have been externally vetted by CREST.

The company raised a GBP 5.5 million Series A investment from Gresham House Ventures, enabling them to scale their workforce and platform capabilities. OnSecurity's subscription-based model and self-service booking platform make it particularly well suited for SMBs, startups, and mid-market organisations that need regular, affordable penetration testing.