Penetration testing firm trusted by nine of the top ten US banks, with the Resolve platform for continuous attack surface management.
Accreditations: SOC 2, ISO 27001, CREST
Services: Web Application, Network, Cloud, API +7
Best Web Application Penetration Testing Companies (2026)
Web application penetration testing is the most commonly needed form of security testing, and choosing the right provider is critical. The best web app pen testing companies follow OWASP methodologies, test for business logic vulnerabilities that automated scanners miss, and provide actionable remediation guidance.
About this list
All providers listed below offer comprehensive web application penetration testing as a core service, with experienced testers who understand modern web frameworks, APIs, and authentication patterns.
Related: Web app pen testing services · PCI DSS web pen testing · OWASP methodology providers
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SECFORCE
UK offensive security consultancy delivering CREST-accredited penetration testing, adversary simulation and CBEST, TIBER-EU and TBEST threat-led testing, mainly for financial services and other large organisations.
CRESTCBESTSTARISO 27001ISO 9001
- Holds CREST, CBEST, STAR, ISO 27001, ISO 9001, and Cyber Essentials accreditations.
- In business since 2008 (Companies House 06488355); CREST-accredited for penetration testing since 2011.
- CBEST-accredited since 2015; first TIBER engagement in 2018.
- CREST accreditations: penetration testing, vulnerability assessment and threat-led penetration testing (formerly STAR).
92 providers
Compliance audit firm delivering web application and network penetration testing with findings mapped to MITRE ATT&CK, alongside the SOC 2, ISO 27001, CMMC, and FedRAMP assessments the results feed into, from a testing team kept independent of the audit side.
Accreditations: FedRAMP 3PAO, CMMC C3PAO, HITRUST Authorized Assessor, PCI QSA
Services: Web Application, Network, Cloud, Red Teaming +3
Munich- and Budapest-based embedded cybersecurity experts focused on financial services, automotive and mobility, manufacturing and industrial automation, energy and more. The services and platform go beyond compliance, supporting the requirements of the Cyber Resilience Act, PCI PTS, UN R155, ISO/SAE 21434 and other standards and regulations.
Services: IoT, Network, Source Code Review, API +11
US penetration testing firm founded in 2011, running 600+ engagements a year with a fully remote, US-based team. Manual, expert-led testing across web, network, cloud, mobile, wireless, OT/ICS, and AI/LLM. Gartner Sample Vendor for PTaaS.
Accreditations: OSCP Employer
Services: Web Application, Network, Mobile App, Cloud +12
Global enterprise cybersecurity consultancy founded in 1999 in Oxford, holding rare CREST STAR-FS accreditation and delivering penetration testing, red and purple teaming, and PCI QSA services across five international offices.
Accreditations: CREST, CHECK, STAR, ISO 27001, PCI QSA +1
Services: Web Application, Network, Red Teaming, Purple Teaming +7
Global Big Four professional services firm delivering CREST, CHECK, and CBEST-accredited penetration testing and red teaming services from London, serving the UK's largest enterprises and regulated organisations.
Accreditations: CREST, CHECK, CBEST, STAR, ISO 27001 +1
Services: Web Application, Network, IoT, Cloud +9
CREST and CHECK-accredited UK penetration testing and managed security provider formed in 2026 from Pentest People, Bulletproof, and Target Defense, with CREST STAR/TLPT-FS capability and the GuardNest vulnerability management platform.
Accreditations: CREST, CHECK, STAR, NCSC Assured, ISO 27001 +1
Services: Web Application, Network, Mobile App, API +8
Elite UK offensive security consultancy specialising in CBEST/STAR/TIBER red teaming, advanced adversary simulation, and CREST-accredited penetration testing for FTSE 100 clients.
Accreditations: CREST, CHECK, CBEST, STAR, ISO 27001 +2
Services: Web Application, Network, Cloud, Red Teaming +6
Full-service London-based cybersecurity consultancy with CREST, CHECK, and NCSC accreditations delivering offensive testing, managed detection, and strategic advisory services.
Accreditations: CREST, CREST AI Penetration Testing, CHECK, ISO 27001, Cyber Essentials +2
Services: Web Application, Network, Cloud, API +5
Global managed security provider with the elite SpiderLabs penetration testing team and deep PCI DSS compliance expertise.
Accreditations: PCI QSA, ISO 27001, SOC 2, CREST
Services: Web Application, Network, Mobile App, Cloud +6
Manchester-based independent cybersecurity consultancy with over 20 years of experience delivering CREST and CHECK-accredited penetration testing, red teaming, and compliance certification services.
Accreditations: CREST, CHECK, ISO 27001, Cyber Essentials, Cyber Essentials Plus +1
Services: Web Application, Network, Mobile App, Cloud +5
CREST and CHECK-accredited UK penetration testing consultancy with CBEST approval, specialising in infrastructure, application, and simulated attack assessments across the public and private sectors.
Accreditations: CREST, CHECK, CBEST, STAR, ISO 27001 +3
Services: Web Application, Network, Mobile App, Cloud +4
Best Web Application Penetration Testing Companies (2026), FAQs
How long does a web application pen test take?+
A typical web application pen test takes 5-15 days depending on application complexity, number of user roles, and depth of testing. Large enterprise applications with multiple modules may require longer engagements.
What methodology is used for web app pen testing?+
Most providers follow the OWASP Testing Guide and OWASP ASVS (Application Security Verification Standard). Testing covers the OWASP Top 10 plus business logic flaws, authentication issues, and application-specific risks.
Should I pen test my APIs separately?+
If your web application has a significant API layer (REST, GraphQL), dedicated API testing provides deeper coverage. Many providers offer combined web app and API testing engagements for comprehensive coverage.
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