Trusted CREST Penetration Testing Experts.

UK-based specialists with 17 years’ experience

Cyber Security
CHECK Penetration TestingCREST member company for Penetration TestingThe Cyber Scheme Certified TesterCyber Essentials Certified PlusBSI ISO 9001 IEC 27001Crown Commercial Service Supplier logo.

Trusted By

SCC logo.DHCW logo.Bromford housing logo.Terra Quest logo.Croft logo.IDS indata logo.Tilda, genuine goodness logo.Ricoh logo.MGroupServices logo.Beard ConstructionBritish Medical AssociationBoult Wade Tennant, LLPBoult Wade Tennant, LLP
Our Services

Penetration Testing

Aristi is one of the UK’s leading providers of penetration testing services with over 17 years of experience, supporting clients in the public and private sectors. We are a National Cyber Security Centre (NCSC) approved CHECK penetration test company and our testing services are also accredited by CREST. We provide a range of security testing services to help protect your cyber defences, as well as Information Assurance support and training.

SPEAK TO AN EXPERT
Right arrow in grey
Cyber Security
Expert-led testing
Manual, Expert-Led Testing (no shortcuts)
FIND OUT MORE
Right arrow in grey
Compliance-ready reports
Compliance-Ready Reports (ISO 27001, GDPR, CE+)
FIND OUT MORE
Right arrow in grey
Proven track record
Proven Track Record (case studies / testimonials)
FIND OUT MORE
Right arrow in grey

Testimonials

SEE ALL
Right arrow in grey

“Aristi’s services have been crucial in helping us achieve and more importantly, maintain our ISO 27001 and CE+ certifications. Their friendly yet proactive approach to advising and managing security is both methodical and professional. I highly recommend Aristi’s services to any law firm that values the information they hold and wants to do everything technically possible to protect it.”

Daniel O’Connor
IT Director
Boult Wade Tennant

“As a non-technical business owner, technological decisions and areas such as cyber security are incredibly daunting. The team at Aristi took time to understand our business needs, articulated the proposed solutions clearly and supported our team through a very difficult procurement process ensuring we became compliant. They have supported us in winning one of our biggest contracts to date and we couldn't be more grateful for Aristi’s support.”

Harriet Noy
CEO
Hazaar

“We needed a partner who would go the extra mile to provide a personalised service, who could provide broader support in all areas of security. Aristi’s core values closely aligned to our DNA and we’re looking forward to building a close working relationship with them over the next three years.”

Wayne Pownall
Information Security Lead
Bromford

“Being a charity, reputation is so important. Aristi has helped minimise our reputational risk. We’re now working with Aristi to continually perfect our systems to keep us one step ahead of cyber attackers.”

Kerry Davies
Director of Finance and Information
Severn Hospice

“Aristi are the friendly face of IT security. The team at Aristi have helped us through ISO27001 audits and conducted Heath Checks on both our products and our cloud based infrastructure. Their friendly and professional way of working make them easy to work with. IT security is now a highly specialist field and maintaining up to date expertise is near impossible unless you have a dedicated resource. Aristi give us that expertise as and when we need it.”

Ray Green
Director
Focus Data Services

“The Aristi team are easy to work with, patient, and provide information in a timely manner which is why we view them as a partner. Aristi takes the time to ensure security and risk frameworks are understood, what needs correcting and why. Aristi consultants do a great job preparing us for certifications that add value and increase business opportunity.”

Maz Healey
Information Security Manager
Mears Group PLC

“Aristi has worked with Cornwall Fire & Rescue Service for a number of years, initially helping the service develop and implement better security risk management practices. The support and expertise provided by Aristi has led to the service becoming one of a few FRSs gaining a Cyber Essentials Plus Certification. Aristi continue to provide a high level of service supporting CFRS with annual assurance IT Health Checks and Penetration Testing.”

Alan Pengelly
Business Systems & Assurance Manager
Cornwall Fire & Rescue Service

“We have found a perfect partner in Aristi. They share our core ethics and build strong and effective security processes, whilst using plain speech and transparent ways of working to deliver to the client’s needs.”

Jerry Densham
Head of Partner Programme
Digi2al Ltd

“Aristi provided support on guiding us through enhancing our data security, in particular with reference to GDPR. They were so much more than a tick box exercise provider, they gave practical insight and showed an understanding of a busy practice and the risks that arise, be that from speed of email communications to storage of files in cabinets. I would highly recommend them to any law firm looking to ensure they comply with data protection and to have awareness of cyber risks.”

Arun Chuhan
Solicitor
Tenet Compliance & Litigation

“Aristi have provided a number of key services to the force supporting the ability to achieve compliance with national standards. Their in depth knowledge has allowed them to support the creation of documentation, provide training and support the development of Security strategy. In addition to this Aristi have an excellent Penetration testing team who are very helpful in supporting the creation of a scope of works and in understanding the requirements for follow up remediation activities.”

Information Assurance & Compliance Manager
Information Assurance & Compliance Manager
Police

“Cyber security is a key risk for the IFRS Foundation which is why we selected Aristi as our service provider. Aristi’s penetration testing services provide us with valuable insight into our IT environment and provides assurance that our infrastructure and hosted systems are secure. Their professionalism and flexibility is a real asset to us and we look forward to growing the partnership.”

Chad Chandramohan
Chief Technology Officer
IFRS Foundation
Right arrow in grey
Right arrow in white

Ready to Test Your Defences?

Tick in circle
Infrastructure Penetration Testing
Tick in circle
Web App and API Testing
Tick in circle
Red Team Exercises
SPEAK TO AN EXPERT
Right arrow in grey

“Resilience in business is built on preparation, not chance. Just as we stress-test our financial models, we must penetration-test our systems. True cybersecurity means proactively seeking out our weaknesses before someone else does because resilience is not about avoiding challenges, it’s about being ready to withstand and grow stronger from them.”

Harj Singh

Chief Executive Officer

Cyber threats are evolving faster than ever. Attackers are harnessing automation, AI, and increasingly sophisticated tactics to exploit even the smallest vulnerabilities. For organisations, waiting for a breach to expose those weaknesses is no longer an option.
Penetration testing is essential because it flips the script: instead of reacting to threats, businesses proactively uncover and address them. A well-executed penetration test simulates real-world attacks, giving leaders clear insight into where their defences hold strong and where they need reinforcement.
Beyond compliance, penetration testing has become a cornerstone of business resilience. It safeguards customer trust, protects brand reputation, and ensures that digital innovation can move forward without hidden risks. In 2025, resilience belongs to those who test, adapt, and strengthen before adversaries strike.

Protect your business before attackers test it for you.

BOOK YOUR POSTURE ASSESSMENT
Right arrow in grey