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Pen Testing for web apps, API and mobile

Find your critical security gaps – fast

Hands-on testing | UK-based experts | Dedicated pen tester

Book a free scoping session with our CREST-accredited penetration testers and get tailored advice on real-world security risks for your web applications, APIs or mobile apps.

What makes us different? 

Our penetration testing services are more than just a box-ticking exercise. We work with you to provide: 

Expert guidance at every stage

From scoping to remediation, our specialists ensure you understand the testing process, its results and the actions required to stay secure.

Real-world attack scenarios 

We simulate attack techniques used by real adversaries against web apps, APIs and mobile platforms, delivering actionable recommendations tailored to your systems.

Tailored, risk-based approach

Every organisation is unique. We adapt our testing to your applications, frameworks and industry-specific risks.

What we test

Our application penetration testing focuses on the vulnerabilities attackers target most: 

Web apps

OWASP Top 10, authentication and session weaknesses, SQL injection, cross-site scripting (XSS), business logic flaws.

APIs

Insecure endpoints, broken access control, data leakage, injection attacks.

Mobile apps

iOS & Android, insecure storage and encryption, weak API interactions, third-party library risks. Every test is manual-first, with evidence to back up findings and clear remediation steps. Retesting is included to validate fixes. 

Meet the experts behind your cloud security

60+

Years of combined expertise in application and mobile security 

1000+

Hours of testing each year, including OWASP Top 10 assessments

1:1

Expert guidance throughout the engagement

~1,500

Active pen test accounts across industries

Book your scoping session - Limited slots available

Don’t leave vulnerabilities in your applications to chance. Speak to a CREST-accredited tester in the next 24 hours – no obligations.

Real world reviews

I always find GRCS easy to work with. The consultant involved was very professional and friendly, providing plenty of updates throughout the test and clearly explained his findings. ”

Gordon

Good grief, what an eye-opener this was! We chose GRCS because the initial scoping call revealed their pen testers had heard about our not-so-common software setup and their cost was more realistic than the other quotes. ”

Time

It was a pleasure to work with the GRCS team for this pen testing project - from clear guidance from the account manager through to regular updates from the testers themselves. Will use again.”

Tom

Working with the GRCS team is nice and straightforward. Account management and technical functions are good and thus far we've had no real issues.”

Eric

We always use GRCS and this service consistently hits the mark for our clients in terms of expectation. Both Pen Team and Account Managers work with our clients in a professional manner.”

Pedro

We've just concluded an annual, 2 week, Penetration Test programme with GRC Solutions, & I'm pleased to report that the service on offer remains excellent.”

Wez

It has been an absolute pleasure working with [GRC Solutions], they made the process from start to finish so straight forward.”

Heather

Frequently asked questions

A simulated attack on your web, API, or mobile applications to uncover vulnerabilities before attackers do.

Yes. Our testers assess REST/SOAP APIs, as well as iOS and Android mobile apps.

At least annually, and after major code releases, to maintain compliance with PCI DSS, ISO 27001 and the GDPR.

  • Executive summary
  • Technical findings with severity ratings
  • Step-by-step remediation guidance
  • Optional retesting to validate fixes