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With cyber threats rising, even the most well-built web applications can be vulnerable to attacks. Take, for example, the British Library cyber attack in 2023. The attack disrupted its online services for months, exposing the risks organisations face when security is overlooked.
More recently, companies of all sizes have fallen victim to SQL injections, cross-site scripting (XSS), and zero-day exploits—showing that no business is truly safe without robust safety measures in place.
That’s why web application security testing is no longer optional—it’s essential. Firms must proactively test their web apps for weaknesses before hackers do. To help you find the right expertise, we’ve put together a list of the best web application testing companies—top UK firms that are guaranteed to safeguard your digital assets.
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At Microminder Cybersecurity, we pride ourselves on being a specialist infosec consultancy headquartered in London, United Kingdom, with additional locations in Dubai, Ireland, the Netherlands, and the Middle East.
Our commitment to innovation and delivering actionable intelligence has established us as a top-rated cyber defence firm. This is so because our experts, with multidisciplinary industry experience, combine insightful intelligence with an adversarial mindset to effectively combat online threats and address the unique safety challenges of your firm.
As a CREST-certified consultancy firm, we adhere to a rigorous and structured methodology when conducting web application security testing. Our web security solutions encompass activities such as password cracking, log reviews, integrity checks, and network vulnerability scanning. This ingenious approach ensures that potential weaknesses are identified and addressed promptly, safeguarding your digital assets.
We have a proven track record of assisting organisations ranging from startups to large enterprises, tailoring our services to meet diverse security needs.
Engaging with Microminder Cybersecurity offers several benefits:
Business Continuity: Our 24/7/365 service, backed by Service Level Agreements (SLAs), ensures continuous security coverage, maintaining the uninterrupted operation of your firm.
Compliance: We enhance your digital defence and compliance operations, alleviating the complexities of hiring additional personnel or incurring unnecessary expenses.
IT Maturity: Our realistic roadmap and strategy provide a future-proof IT framework, aligning with your organisation's long-term objectives.
Business Alignment and Growth: We implement relentless online safety measures and controls that harmonise with your business growth, ensuring security scales alongside your expansion.
Microminder CS isn’t just any cyber defence company; we are one of the best application security testing companies in the UK, and our client’s testimonials confirm that.
“Excellent service provider. I had a difficult situation with my IT needs in a prison setting, and the team—from reception, IT, and finance—was always helpful and accommodating. Great job, guys. Thank you."— Abdul Khan.
"Malcolm and Florin were so good. I cannot speak highly enough of them. I recommend them to anyone. Thank you very much."— Javier Aguirre.
"Great. The best IT computer company in the universe. Can solve any computer-related problem. And the staff and management are amazing. NASA should hire them."— Rajan Gudka.
"Great service and a great bunch of lads to boot; couldn't recommend more highly!"— Brian McCarthy
We invite you to experience our web application testing services firsthand. Contact us today and let's discuss how we can tailor our solutions to meet your specific business needs.
Headquarters: London, UK
Founded: 1984
Email Address: info@micromindercs.com
Website: https://www.micromindercs.com/
Contact: +44 203-336-7200
Address: 8a Wadsworth Rd, Perivale, London, England UB6 7JD, GB
Specialisation: Web App Testing, Source Code Review, Penetration Testing, Digital Forensics, Incident Response, Cloud Security
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TestDel has been ensuring the successful delivery of software solutions for over five years. The team works with organisations across various industries, helping software development firms and end clients overcome quality assurance challenges efficiently. With expertise in manual and automated processes, TestDel evaluates web, desktop, mobile, and cloud-based platforms to enhance functionality and user experience.
Every project is handled by experienced professionals from renowned technology and management institutions, bringing industry knowledge from IT, telecom, retail, aviation, utilities, and banking. By delivering thorough assessments on time and within budget, the company ensures software performs as intended for those who rely on it.
Headquarters: Middlesex, UK
Founded: 2005
Email Address: team@testdel.com
Website: https://testdel.com/
Contact: +44 207-993-6054
Address: 21 Woodfield Road, Hounslow, Middlesex TW4 6LL
Specialisation: Web Applications Testing, Mobile Applications Security Evaluation, Desktop Applications Safety Assessment, Internet Of Things Testing
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Since 2009, WebDepend has offered quality assurance and testing services, collaborating with brands, businesses, and digital agencies to ensure that websites, mobile apps, and web applications work properly across various browsers and devices. The team's thoroughness, adaptability, and vast industry experience facilitate smoother project execution for clients lacking dedicated QA resources.
Clients appreciate its careful attention to detail, flexibility in adapting to shifting project timelines, and ability to spot problems that others might miss. That is why WebDepend has partnered with prominent brands in sectors like retail, automotive, hospitality, pharmaceuticals, and charities, consistently providing valuable insights into project quality.
Headquarters: Exeter, UK
Founded: 2009
Email Address: enquiries@webdepend.co.uk
Website: https://www.webdepend.co.uk/
Contact: +44 139-258-0944
Address: The Generator Hub, The Gallery, Kings Wharf, The Quay, Exeter, Devon EX2 4AN, GB
Specialisation: Web Application Monitoring, Audits, Testing
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AscentiQ is another independent software testing company based in the UK that specialises in quality assurance to enhance customers' software experiences. Established in 2012 by a team of management consultants, the company identified a significant need for independent software testing services in the UK market.
To assist firms in the UK, AscentiQ offers a range of services, including web application testing, test automation, user acceptance, functional, accessibility, risk-based and API testing services. The firm operates on the principles of domain-led expertise and innovative, IP-led solutions.
Headquarters: London, UK
Founded: 2012
Email Address: sales@ascentiqsolutions.co.uk
Website: https://ascentiqsolutions.co.uk/
Contact: +44 203-435-6842
Address: Office T31, 103 Cranbrook Road, Ilford, London, IG1 4PU
Specialisation: Web Application Testing
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nFocus has been delivering test automation services for 24 years, earning recognition through multiple awards. It is the only company to have been named Leading Vendor by the European Software Testing Awards twice and has also been featured in Test Magazine’s Leading Testing Providers. Its professionals provide expert guidance through readiness assessments, health checks, consultancy, web app testing, performance analysis, penetration testing, and mobile app evaluation.
The agency did not stop at that. Its experts help enterprises in the UK to implement, improve and maintain test automation to enable Agile and DevOps during the web application development process. This guarantees that your app is well secured from threats.
Headquarters: Shropshire, UK
Founded: 2000
Email Address: info@nfocus.co.uk
Website: https://www.nfocus.co.uk/
Contact: +44 370-242-6235
Address: e-Innovation Centre, Priorslee, Telford, Shropshire TF2 9FT
Specialisation: Performance Testing, Mobile App Testing, Penetration Testing, Software Health Check
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Holding certification in the ISO 9001 and ISO 27001 standards, North IT provides penetration testing and IT defence consultancy for both public and private sector clients. Since its creation in 2012, the agency has been assisting firms in the UK with pen testing solutions and security auditing, assessing their defence posture by testing networks, web apps and mobile applications.
North IT’s experience is diverse, that is why the team works with organisations worldwide, helping them strengthen their defences against threats. By working closely with businesses of all sizes, North IT ensures systems are robust, resilient, and prepared for potential risks.
Headquarters: Middlesbrough, UK
Founded: 2012
Email Address: talk@northit.co.uk
Website: https://www.northit.co.uk
Contact: +44 164-206-1111
Address: 16-26 Albert Road, Middlesbrough, TS1 1QA, UK
Specialisation: Web App Security, Penetration Testing, Code Audits
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Cyphere, based in Manchester, also focuses on pen testing and managed security services. For organisations that are searching for a web application testing solution, the team helps evaluate web service APIs, web applications, and operating systems, ensuring they are safeguarded against potential threats. With CREST-accredited expertise, they go beyond surface-level scans, identifying vulnerabilities that could impact business operations and customer confidence.
The company works across offensive and defensive security, supporting industries such as finance, healthcare, e-commerce, technology, government, and education, by addressing sector-specific challenges with tailored assessments and ongoing protection.
Headquarters: Stamford, UK
Founded: 2020
Email Address: info@thecyphere.com
Website: https://thecyphere.com/
Contact: +44 333-050-9002
Address: F1, Kennedy House,31 Stamford St, Altrincham WA14 1ES
Specialisation: Ethical Hacking, Web Application Security, Vulnerability Assessment, Risk Remediation
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Since its incorporation in 2019, Sencode has continued to grow, driven by a team with extensive industry experience. Sencode offerings include thorough assessments followed by tailored remediation strategies specific to the unique demands of various sectors. Its specialised advanced penetration testing services certified by CREST, focuses on both technical and social engineering aspects.
The agency also provides a complimentary retest and incorporates carbon offsetting measures for all its penetration testing engagements, ensuring both safety and sustainability in its operations. By applying established methodologies such as OWASP and PTES alongside its tailored approaches, Sencode ensures each assessment meets the highest standards.
Headquarters: Stockton-on-Tees, UK
Founded: 2019
Email Address: office@sencode.co.uk
Website: https://sencode.co.uk/
Contact: +44 164-271-6680
Address: Fusion Hive, North Shore Road, Stockton-on-Tees, United Kingdom TS18 2NB
Specialisation: Web Application Penetration Testing, Training, Cyber Awareness, OSINT, Vulnerability Assessment
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Pentest People's team, composed of CREST and CHECK certified experts, provides web app safety testing to safeguard applications from potential attacks. Their extensive experience across various industries gives them the knowledge and understanding to protect complex corporate systems.
The Group Head of IT at Linbrooke stated that Pentest People was instrumental in helping their organisation achieve ISO 27001:2013 and Cyber Essentials certifications. They commended Pentest People's expertise, professionalism, and customer-centric approach, emphasising the significant improvements made to their ICT infrastructure as a result of the partnership. Based on their positive experience, the client gave Pentest People their highest recommendation.
Headquarters: London, UK
Founded: 2018
Email Address: info@pentestpeople.com
Website: https://www.pentestpeople.com/
Contact: +44 330-311-0990
Address: 20 Grosvenor Place, London, United Kingdom, SW1X 7HN
Specialisation: Web Application, Infrastructure Penetration Testing, Social Engineering Assessment
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As experts in both manual and automated testing of mobile software and applications, KiwiQA thoroughly inspects them for consistency, usability, and optimal functionality. The company emphasises precision and user needs when delivering its services to its clients. As expected, the company is made up of experienced professionals, ensuring IT systems function flawlessly. Aside from that, the team conducts code assessments to make sure your code is extensible and free of vulnerabilities that can jeopardise safety.
The company has successfully conducted over 100,000 test cases and discovered more than 50,000 bugs that would have otherwise gone unnoticed.
Headquarters: Hounslow, UK
Founded: 2009
Email Address: sales@kiwiqa.com
Website: https://www.kiwiqa.com/
Contact: +61 472-869-800
Address: Vista Business Centre 50 Salisbury Road Hounslow TW4 6JQ United Kingdom
Specialisation: Test Automation, Functional Testing, Salesforce Implementation
Web application testing can be conducted in various ways and at different stages of the Software Development Lifecycle (SDLC) or even after development if you haven't tested it before. Here are some common approaches
| Type | Explanation |
| Static Application Security Testing (SAST) | SAST scans an application’s source code to spot security flaws before the software even runs. Since it doesn’t need a functioning application, it fits well into the early stages of development. It can be integrated into the development workflow, catching vulnerabilities before the code is merged into the main repository. By identifying issues at this stage, teams can fix them before they become costly problems later on. |
| Dynamic Application Security Testing (DAST) | Unlike SAST, which looks at code, DAST assesses how an application behaves while it’s running. It simulates real-world attacks by sending different types of input—some valid, some malicious—to see if the system reacts in an insecure way. Because it requires a live application, DAST usually happens during testing, before deployment. It’s useful for catching bugs that only appear when an application is actually in use. |
| Runtime Application Self-Protection (RASP) | RASP goes a step further by actively monitoring an application while it’s running in a production environment. Instead of just detecting issues, it reacts in real time, blocking suspicious activity as it happens. It watches how data moves through the application and intervenes when it detects behaviour that could indicate an attack. Since RASP works within the app itself, it provides ongoing security even after deployment. |
| Penetration Testing (Pen Testing) | Pen testing is a hands-on security assessment where experts simulate cyberattacks to uncover weaknesses. Unlike automated tools, pen testers think like real attackers, attempting to exploit vulnerabilities to gain access to sensitive data or take control of the system. It’s usually done on live applications and provides a more thorough analysis of security risks, often revealing issues that automated testing might miss. |
When you hire a web application security testing company to safeguard your web app, there are a few key deliverables you should expect.
Executive summary: A well-structured safety assessment report should begin with an executive summary. This section gives a high-level overview of the findings, making it easy for senior management and non-technical stakeholders to grasp the key risks without getting lost in technical details. It outlines major vulnerabilities, their potential impact, and the overall security posture of the application.
Detailed vulnerability report: Beyond the summary, the report should provide a thorough breakdown of the web app evaluation. It should list each vulnerability found, explain how it was discovered, and assess its severity. More importantly, it should include clear recommendations on how to fix or mitigate these issues, allowing your development team to take corrective action.
Live debrief session: Many companies also offer a live debrief to walk you through the findings. This is an opportunity to discuss the results in detail, ask questions, and get clarification on any security concerns. It ensures you fully understand the risks and next steps needed to strengthen your application’s security.
Here is our curated list of top web application testing companies in the UK. Each agency offers a range of services, including web app penetration testing, functional testing, vulnerability assessments, and remediation efforts. These services are designed to protect your business from potential threats. When choosing a cybersecurity partner, it's crucial to select one that customises its offerings to meet your specific needs. Microminder CS exemplifies such a company. Our professionals will evaluate your requirements and develop a tailored solution for you. Reach out to our team today.
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