In today’s digital-first world, protecting software applications from security threats is not just essential – it’s a priority. As cyberattacks become more advanced and widespread, businesses in the UK are turning to application security testing (AST) to uncover and fix vulnerabilities before they can be exploited.
This article explores some of the top-rated companies in the UK that specialize in application security testing. Whether you’re looking for penetration testing, static code analysis, or full-scale security audits, the firms listed here have proven track records in helping businesses safeguard their digital assets.
1. A‑Listware
We’re a UK‑registered technology company based in St Leonards‑On‑Sea, with a seasoned R&D centre. We support UK businesses, especially startups and fast‑growing firms by helping them expand their development capacity in a cost‑effective way. Through dedicated frontend, backend, and DevOps teams, we focus on delivering secure and reliable digital solutions tailored to our clients’ needs.
We offer security‑aware development and testing integrated into the delivery process. Our teams use established methods in manual and automated testing to uncover and fix vulnerabilities early building confidence in both the code and infrastructure supporting UK‑based services
נקודות עיקריות:
- We provide dedicated development teams with security testing built into workflows
- We integrate manual and automated testing across web, mobile, microservices and cloud
- We emphasise transparency and cultural fit, operating as if we were your in‑house team
- We align with UK client expectations on secure development and deliverability
שירותים:
- Staff augmentation: secure engineering teams embedded in your projects
- Web, mobile and backend application security testing
- Manual and automated test routines, including vulnerability and integration testing
- QA support for microservices, IoT, big‑data and other modern architectures
- DevOps and cloud build secure by design scanning builds and infrastructure
פרטי קשר:
- אֲתַר אִינטֶרנֶט: a-listware.com
- אֶלֶקטרוֹנִי: info@a-listware.com
- פייסבוק: www.facebook.com/alistware
- לינקדאין: www.linkedin.com/company/a-listware
- כתובת: סנט ליאונרדס-און-סי, TN37 7TA, בריטניה
- מספר טלפון: 44 (0)142 439 01 40+
2. Renaissance Computer Services (UK)
Renaissance Computer Services is a UK‑based IT consultancy that provides a range of security-focused services, including application security testing. They perform penetration tests, vulnerability scans, and ethical hacking to identify weaknesses within a company’s applications, networks, and endpoints. Their pen‑test approach simulates real‑world cyberattacks, generating reports that highlight vulnerabilities and suggest remediation steps. They offer internal and external vulnerability scanning via automated tools, enabling regular assessments to catch security gaps early.
Beyond technical testing, they support ongoing security through managed cyber security services. These include managed antivirus, cloud backup, security monitoring, and incident response guidance which complement testing by strengthening overall protection and helping maintain compliance.
נקודות עיקריות:
- CREST‑accredited penetration testing reports
- Automated internal and external vulnerability scanning
- Simulated real‑world attacks for application and network systems
- Managed security services: antivirus, backups, monitoring, incident support
- Regular retesting to confirm fixes are effective
שירותים:
- Penetration testing (simulated cyberattacks and follow‑up retesting)
- Vulnerability scanning (internal and external scans)
- Ethical hacking and risk assessment support
- Managed cyber security services (antivirus, backup, monitoring, incident response)
- Security consultancy and compliance assistance
פרטי קשר:
- Website: www.renaissance.co.uk
- Email: web@renaissance.co.uk
- Phone: 01923690700
- Address: Unit 20, Orbital 25 Business Park Watford, WD18 9DA
- LinkedIn: www.linkedin.com/company/renaissance-computer-services
- Facebook: www.facebook.com/renaissancecomputers
3. Hedgehog Security Ltd
Hedgehog Security Ltd is a UK-based cyber security firm with offices in Manchester and Gibraltar. They focus on protecting applications and networks through services like penetration testing, threat detection and managed security. Their approach uses industry standards such as OWASP and ISO 27001 for application-level testing, and they support clients with ongoing monitoring via their SOC365 program.
They also engage in regular security practices such as internal pentests, vulnerability assessments and threat detection, alongside providing guidance on cyber threats like APT groups. The firm uses a mix of automated tools and manual techniques to find weaknesses, and emphasizes continuous protection through managed detection and response.
נקודות עיקריות:
- Internal penetration testing for internet-facing applications
- Methodology aligned with OWASP and ISO 27001 standards
- Real-time threat detection via SOC365 managed service
- Manual and automated assessments, including vulnerability scanning
- Coverage of cyber threat intelligence and guidance on APT groups
שירותים:
- Application penetration testing (web and internal apps)
- Vulnerability assessment and scanning
- Managed Security Operations Centre (SOC365)
- Threat detection and incident response support
- Cybersecurity consultancy and threat intelligence
פרטי קשר:
- Website: www.hedgehogsecurity.co.uk
- Email: hello@wearehedgehog.com
- Phone: 03333444256
- LinkedIn: www.linkedin.com/company/hedgehogsec
- Twitter: x.com/hedgehogsec
4. Secarma Limited
Secarma is a Manchester‑based cybersecurity consultancy that provides a wide range of testing and advisory services. They focus on web, mobile, infrastructure, cloud, wireless and IoT application penetration testing. Their testing combines manual and automated approaches to uncover complex security flaws beyond the usual scan results.
They also offer advisory and certification services under their ACT Framework covering strategic support like security maturity assessments, incident response planning, and threat modelling, alongside certification help for standards such as Cyber Essentials, IASME and ISO 27001. Their training programmes include web app hacking and network security courses aimed at helping organisations boost in‑house security awareness and skills.
נקודות עיקריות:
- Penetration testing across web, mobile, infrastructure, cloud, wireless and red‑teaming
- Advisory services: maturity assessments, threat modelling, incident exercise support
- Training for developers and IT staff on web‑app and network security
- Certification support: Cyber Essentials, IASME, ISO 27001 and IoT security schemes
- Creative testing methods combining manual and automated techniques
שירותים:
- Web, mobile, infrastructure, wireless, cloud penetration testing
- Red‑teaming and configuration reviews (firewall, cloud, builds)
- Vulnerability scanning
- Security training (web‑app hacking, network defence, awareness)
- Advisory: maturity assessments, incident response exercises, threat modelling
- Certification guidance (Cyber Essentials, IASME, ISO 27001, IoT schemes)
פרטי קשר:
- Website: secarma.com
- Phone: 0161 513 0960
- Address: 3 Archway, Birley Fields, Manchester, M15 5QJ
- LinkedIn: www.linkedin.com/company//secarma-uk
5. LRQA Group Limited
LRQA is a UK-based provider of cyber security services with a focus on application security testing. They offer a wide selection of testing services, including penetration testing for web, mobile, cloud, IoT, and infrastructure. Their work combines manual and automated testing to uncover vulnerabilities and support remediation with detailed reports.
In addition to technical assessments, LRQA provides broader cyber security support such as continuous assurance, red and purple teaming, social engineering, and bug bounty programs. They also offer governance, risk and compliance services, managed detection and response, and consulting around regulatory standards like ISO 27001, PCI DSS, and Cyber Essentials.
נקודות עיקריות:
- Penetration testing across web, mobile, cloud, IoT, network, and infrastructure systems
- Continuous assurance and scenario-based testing including red and purple teaming
- CREST-certified testers and extensive accreditation (CREST, PCI SSC, ISC2, NCSC)
- Managed vulnerability scanning and RemOps framework for remediation
- Governance, risk, compliance support including ISO 27001, Cyber Essentials, PCI DSS
שירותים:
- Web, mobile, cloud, IoT and infrastructure penetration testing
- Vulnerability scanning and managed vulnerability services
- Continuous assurance, red teaming, purple teaming, social engineering, bug bounty
- Governance, risk and compliance consulting (ISO 27001, PCI DSS, Cyber Essentials, etc)
- Threat intelligence, virtual CISO, incident response and managed SOC services
פרטי קשר:
- Website: www.lrqa.com
- Phone: +44 345 520 0085
- Address: 1, Trinity Park, Bickenhill Lane, Birmingham B37 7ES.
- LinkedIn: www.linkedin.com/company/lrqa
- Twitter: x.com/lrqa
6. NCC Group
NCC Group is a UK-based cybersecurity consultancy that conducts application security testing and assessments worldwide. They focus on identifying weaknesses in web, mobile, cloud, and desktop applications through manual and automated testing methods. Their teams simulate real-world attack scenarios to uncover vulnerabilities and support organisations by guiding remediation and improving ongoing security measures.
In addition to technical testing, NCC Group supports clients in responding to security incidents and aligning their application security practices with compliance and risk management frameworks. They bring deep domain expertise to both niche and large-scale environments, working alongside teams during critical events to help maintain application safety.
נקודות עיקריות:
- Performs application penetration testing across various platforms (web, mobile, cloud, desktop)
- Uses both manual and automated testing techniques
- Simulates real-world attack scenarios
- Offers incident response support for application-related security events
- Aligns testing practices with compliance and risk frameworks
שירותים:
- Application penetration testing and security assessments
- Web, mobile, cloud, and desktop application testing
- Threat simulation and ethical hacking
- Incident response guidance for application security incidents
- Advisory support for compliance and risk alignment
פרטי קשר:
- אֲתַר אִינטֶרנֶט: www.nccgroup.com
- Email: cirt@nccgroup.com
- Address: XYZ Building 2 Hardman Boulevard Spinningfields Manchester, M3 3AQ
- Phone: +4401612095200
- לינקדאין: www.linkedin.com/company/ncc-group
- טוויטר: x.com/NCCGroupplc
7. SECNAP Network Security
SECNAP Network Security is a cybersecurity company offering application security testing alongside broader vulnerability assessments and managed detection services. They assess web applications and APIs using tools like Burp Suite combined with expert manual review, focusing on issues such as authentication flaws, input validation, and OWASP Top 10 risks. Their evaluations include authenticated and unauthenticated testing, detailed reporting, and retesting of fixes for verification.
They also provide internal and external vulnerability assessments to uncover network misconfigurations and exposed services. These services blend automated scanning with human-led analysis that prioritizes real-world exploitability and risk‑based remediation guidance. Their offering is supported by a 24/7 managed detection platform, CloudJacket MDR, which integrates threat hunting and incident response to support ongoing application security.
נקודות עיקריות:
- Application security assessments using Burp Suite and manual validation
- OWASP Top 10 focus, including authenticated and unauthenticated testing
- Internal and external vulnerability assessments with expert analysis
- 24/7 monitoring and incident response via CloudJacket MDR platform
- Retesting of remediation to confirm vulnerabilities are resolved
שירותים:
- Web application and API security assessments
- External vulnerability scanning and testing
- Internal network vulnerability assessments
- Managed detection & response (CloudJacket MDR)
- Security awareness training, dark web monitoring, compliance audits
פרטי קשר:
- Website: www.secnap.com
- Phone: +1 (954) 350-0780
- Address: 500 East Broward Boulevard Fort Lauderdale, FL 33394
- LinkedIn: www.linkedin.com/company/secnap-network-security
- Twitter: x.com/secnap
- Facebook: www.facebook.com/secnap
- Instagram: www.instagram.com/secnapnetworksecurity
8. Qualitest Group Ltd
Qualitest Group is a UK-operating cybersecurity and quality engineering firm that provides application security testing as part of its broader cyber-security testing services. They embed security into software development with both automated and manual methods, covering static, dynamic, and interactive application testing aligned with a “shift-left” DevSecOps approach.
They support AppSec across web, mobile, APIs, cloud, and infrastructure. Their services include both on-demand penetration testing and continuous security assurance integrated into CI/CD pipelines. They also assist in compliance efforts and secure design through code review and threat modelling.
נקודות עיקריות:
- Conducts Static Application Security Testing (SAST) that integrates into CI/CD pipelines to identify code-level vulnerabilities early
- Offers Dynamic Application Security Testing (DAST) and interactive testing within development and production environments
- Provides continuous mobile app security scanning with focus on app-store compliance
- Delivers penetration testing for web and mobile applications, evidenced in real-world case studies
- Follows an AppSec “security by design” DevSecOps framework and supports compliance with GDPR, PCI DSS, HIPAA, etc.
שירותים:
- Static Application Security Testing (SAST)
- Dynamic Application Security Testing (DAST)
- Mobile application security scanning and penetration testing
- Web application penetration testing
- בדיקות אבטחה של API
- Penetration testing integrated into CI/CD pipelines
- Compliance consulting (GDPR, PCI DSS, HIPAA etc.)
פרטי קשר:
- אתר אינטרנט: www.qualitestgroup.com
- Address: Level 2, Equitable House 47 King William Street EC4R 9AF
- לינקדאין: www.linkedin.com/company/qualitest
- טוויטר: x.com/QualiTest
- פייסבוק: www.facebook.com/Qualitestgroup
- אינסטגרם: www.instagram.com/lifeatqualitest
9. Cytix Ltd
Cytix Ltd is a Manchester-based company that offers a continuous security testing platform for applications, APIs, cloud-native services and traditional infrastructure. They take live development data like pull requests, tickets or threat intelligence and use it to trigger automated and manual testing actions tailored to each change. Their system bridges the gap between automation and hands-on testing, helping security teams detect vulnerabilities like business logic flaws sooner.
They are CREST-accredited and provide their platform either for internal use or as a fully managed service. Their solution helps teams shorten the time between a code change and finding potential security issues, enabling faster remediation workflows.
נקודות עיקריות:
- First continuous security testing platform driven by development change telemetry
- CREST-accredited testing engine with both automated and manual test orchestration
- Targets vulnerabilities including business logic flaws, auth issues, web, mobile, cloud and API gaps
- Integrates with development tools like Jira, GitHub, AWS and Azure
- Offers fully managed penetration testing service or self-managed testing platform
שירותים:
- Continuous security testing orchestration based on development changes
- Automated scanning and manual micro pentests as needed
- Threat modelling of live pull requests or tickets
- Support for web, mobile app, API, cloud-native and infrastructure security
- Managed service option with CREST-accredited penetration testing
פרטי קשר:
- Website: www.cytix.io
- Address: 14043556, Eagle House, 64 Cross Street, Manchester, M2 4JQ
- LinkedIn: uk.linkedin.com/company/cytix
10. A1QA LLC
A1QA is a global software testing firm with operations that extend to UK-based clients. They include application security testing as part of their broader cybersecurity and QA services. Their testing covers static code analysis, penetration testing, vulnerability scanning, and compliance verification across web, mobile, cloud, and embedded systems.
They adapt testing methods white‑box (code access), grey‑box (partial knowledge), and black‑box (external approach) to align with different SDLC stages: development, pre‑production, and production environments. Their Centre of Excellence focuses on evolving test techniques to match modern security standards.
נקודות עיקריות:
- Perform static code analysis to identify code issues and verify security controls in source code
- Use penetration testing (white‑, grey‑, black‑box) to simulate real‑world attacks across application layers
- Conduct comprehensive web application testing, combining functional, performance, compatibility, and security checks
- Offer mobile app vulnerability assessments, compliant with OWASP Mobile Top 10
- Validate compliance to standards like PCI DSS
שירותים:
- Static Application Security Testing (source code scanning)
- Dynamic / penetration testing (white‑, grey‑, black‑box)
- Web application security assessment
- Mobile application security evaluation and testing
- Vulnerability scanning and compliance testing (e.g. PCI DSS)
פרטי קשר:
- אתר אינטרנט: www.a1qa.com
- Phone: +44 204 525 7620
- Address: 3d Floor, 5-8 Dysart Street, Moorgate House, London, EC2A 2BX
- לינקדאין: www.linkedin.com/company/a1qa
- טוויטר: x.com/a1qa_testing
- פייסבוק: www.facebook.com/a1qa.software.testing
11. MDSec Ltd
MDSec Ltd is a UK-based cybersecurity consultancy with a strong focus on application security testing. They deliver in-depth assessments across multiple layers including manual code reviews, threat modelling, DevOps integrations and black-box testing especially for complex systems, modern frameworks and microservices architectures.
Their expertise is rooted in the team behind the Web Application Hacker’s Handbook, and they also offer specialist training courses designed to enhance the application security skills of developers and security teams.
נקודות עיקריות:
- Application security testing across DevOps, code review, threat modelling and black-box assessments
- Specialise in modern, complex systems and microservice architectures
- Team includes authors and experts behind Web Application Hacker’s Handbook
- Offers specialist training to boost in-house appsec skills
שירותים:
- DevOps-integrated application security testing
- Manual source code review
- Black-box web application assessments
- Threat modelling and security design reviews
- Application security training courses
פרטי קשר:
- Website: www.mdsec.co.uk
- Email: contact@mdsec.co.uk
- Phone: +44 (0) 1625 263 503
- Address: 32A Park Green Macclesfield, Cheshire SK11 7NA
12. Intruder Ltd
Intruder Ltd is a UK-based cybersecurity provider focused on automated vulnerability scanning and application security testing. Their platform enables organisations to run DAST scans on web applications, APIs, infrastructure and cloud services with minimal setup, combining automated scanning and manual penetration testing to uncover configuration issues, injection flaws and OWASP Top 10 vulnerabilities.
They support continuous testing by discovering new assets in cloud environments, triggering scans on changes, and delivering noise-filtered, prioritised results with remediation guidance. Their tool integrates with CI/CD pipelines, issue trackers and threat intelligence feeds, offering both authenticated and unauthenticated testing options.
נקודות עיקריות:
- Cloud-based vulnerability scanner for external/internal assets and web apps
- Automated DAST checks for OWASP Top 10, misconfigurations, zero-days
- Combines automated scanning with optional manual penetration testing
- Triggers scans automatically on asset changes and emerging threats
- Integrates with CI/CD tools, issue trackers and cloud platforms
שירותים:
- Automated vulnerability scanning for web apps, APIs, cloud, infrastructure
- Continuous web application penetration testing service
- Manual web app penetration testing on demand
- Authenticated and unauthenticated testing modes
- CI/CD integration and prioritized remediation reports
פרטי קשר:
- Website: www.intruder.io
- Email: contact@intruder.io
- Address: Intruder Systems Ltd WeWork, 1 Mark Square, London, EC2A 4EG, UK
- LinkedIn: www.linkedin.com/company/intruder
- Twitter: x.com/intruder_io
- Facebook: www.facebook.com/intruder.io
13. Qualys Inc.
Qualys is a global cybersecurity technology firm offering cloud-based application security testing tools that cater to UK organisations via its local UK platform and office. Their flagship Web Application Scanning (WAS) solution delivers dynamic application security testing (DAST) for web apps and APIs, including multi-cloud and on-prem environments. It integrates automated scans with AI-assisted workflows and authenticated testing to identify OWASP Top 10, API-specific issues, misconfigurations, and malware in real time.
Beyond DAST, Qualys provides a unified platform Enterprise TruRisk that includes continuous vulnerability management, web application firewall (WAF), container security, cloud workload protection, and compliance monitoring. WAS integrates with CI/CD pipelines and issue trackers to support DevOps workflows, and the UK Platform 1 specifically serves regional clients via their Reading office.
נקודות עיקריות:
- Offers cloud-based Web Application Scanning (DAST) for web apps and APIs
- Detects OWASP Top 10, API vulnerabilities, misconfigurations, malware exposure
- Integrates automated and authenticated scans with AI-assisted prioritisation
- Part of a broader Enterprise TruRisk platform featuring WAF, vulnerability management, cloud security
- UK-based platform (“UK Platform 1”) hosted in Reading for local compliance and data residency
- CI/CD, DevOps, and ticketing integration (Jira, Jenkins, Azure DevOps) for shift-left testing
שירותים:
- Dynamic application security testing (DAST) using WAS
- Web application firewall deployment and monitoring
- Malware detection for web environments
- Continuous vulnerability detection across web, cloud, containers
- CI/CD integrations and developer-oriented vulnerability workflows
פרטי קשר:
- Website: www.qualys.com
- Email: info-uk@qualys.com
- Phone: +44 (0) 1189131500
- Address: Qualys Ltd 100 Brook Drive Green Park Reading, Berkshire RG2 6UJ United Kingdom
- LinkedIn: www.linkedin.com/company/qualys
- Twitter: x.com/qualys
- Facebook: www.facebook.com/qualys
- Instagram: www.instagram.com/qualyscloud
14. ראפיד 7
Rapid7 is a global cybersecurity firm with a strong presence in theUK. They develop application security testing tools and services as part of their Insight platform. Their InsightAppSec product provides dynamic application security testing (DAST), offering automated black-box testing of modern web apps and APIs to detect vulnerabilities like OWASP Top 10, misconfigurations, and malware exposure.
They also offer managed application security services, combining automated scanning with expert validation, threat modelling, runtime protection (via tCell WAF/RASP), and orchestration with CI/CD pipelines. Rapid7 integrates DAST results into DevOps workflows to enable faster remediation and maintain application security over time
נקודות עיקריות:
- Cloud-based DAST tool InsightAppSec for web apps and APIs
- Detects OWASP Top 10 risks, API flaws, misconfigurations, malware
- Supports authenticated and unauthenticated scans with AI prioritisation
- Offers managed services, threat modelling, and runtime protection (tCell)
- Integrates with CI/CD pipelines, issue trackers (Jira, Jenkins, Azure DevOps)
שירותים:
- Dynamic application security testing (InsightAppSec)
- Managed application security services with expert validation
- Runtime app protection with tCell WAF + RASP
- Integration with CI/CD and developer workflows
- Continuous vulnerability assessment across web, cloud, containers
פרטי קשר:
- אתר אינטרנט: www.rapid7.com
- Phone: +44 (0)118 207 9300
- Address: 19 Chichester Street, Belfast, BT14JB, UK
- לינקדאין: www.linkedin.com/company/rapid7
- טוויטר: x.com/Rapid7
- פייסבוק: www.facebook.com/rapid7
- אינסטגרם: www.instagram.com/rapid7
מַסְקָנָה
Application security is an essential part of protecting any digital environment, and the UK is home to a wide range of companies that specialise in this field. Whether you’re a startup seeking cost-effective testing options, a large enterprise looking for continuous security coverage, or a non-profit needing to meet compliance requirements, there are experienced providers offering solutions that match your needs.
This article has introduced a selection of UK-based and UK-serving companies involved in application security testing. Their services range from automated scanning and penetration testing to full-scale security programmes and managed services. By reviewing the offerings and expertise of these firms, organisations can make informed decisions about strengthening their application security posture.
