Security Audit

10 Top Pen Testing Companies UK [Reviewed]

Updated on: January 9, 2024

10 Top Pen Testing Companies UK [Reviewed]

When it comes to penetration testing, UK is home to some of the best companies in the world. But with so many options to choose from, how do you know which one is right for you? In this article, we will review 10 of the top penetration testing companies in UK and discuss what makes them stand out from the competition.

We’ll also take a look at some of the key features that every pentest company should offer. So whether you’re looking for a self-served tool or in need of more comprehensive support, you’ll be able to find the perfect pentest company for your business here.

List of Top 10 Penetration Testing Companies In UK

  1. Astra Security
  2. Redscan
  3. Blaze
  4. Aardwolf security
  5. Breachlock
  6. Intruder
  7. Dhound
  8. CyberQ Group
  9. Netsparker
  10. Acunetix

Why Astra is the best in pentesting?

  • We’re the only company that combines automated & manual pentest to create a one-of-a-kind pentest platform
  • Vetted scans ensure zero false positives
  • Our intelligent vulnerability scanner emulates hacker behavior & evolves with every pentest
  • Astra’s scanner helps you shift left by integrating with your CI/CD
  • Our platform helps you uncover, manage & fix vulnerabilities in one place
  • Trusted by the brands you trust like Agora, Spicejet, Muthoot, Dream11, etc.

10 Top Pen Testing Companies UK

Penetration Testing CompanyServices offered
Astra SecurityAutomated and manual pentesting, vetted scans with zero false positives, CI/CD integration, scan behind login, vulnerability management, and pentest certificate
RedscanVulnerability management, CREST certified pentesters, tailored reporting
BlazeWeb app penetration testing, physical pentest
Aardwolf SecurityPentest by NCSC certified security experts
BreachlockPentest on demand, monthly automated scanning, follows OWASP methodology
IntruderVulnerability management, manual pentesting, tailored reporting
DhoundPentest on demand, web app pentest, network penetration testing
CyberQ GroupContinuous breach detection, cyber due diligence
NetsparkerVulnerability management, application security audit
AcunetixVulnerability scanning, compliance reporting

Top 10 penetration testing companies in UK

Let us help you explore and know more about the best pentesting companies in the business. See if you can find the right fit among these.

1. Astra Security

penetration testing companies in the UK cyber security auditors penetration testing services - Astra

One of the best provider of web application penetration testing in UK is Astra Security. It is a power-packed security company well known for its Astra Pentest Platform.

Astra’s pentest platform is a comprehensive solution to your security testing needs with 8000+ test cases, a host of integrations, continuous pentesting, and compliance reporting features.

Here are some key features

Astra security is a well-rounded company that offers a wide array of features. We are going to pick the ones that set them apart from the crowd.

  1. CI/CD integration: You can easily integrate Astra’s pentest suite with your SDLC and never worry about pushing vulnerable code into production.
  2. Scan behind logged-in pages: Authenticate the automated scanner once with the help of Astra’s login recorder and you shouldn’t worry about authentication for scanning behind the login page.
  3. Contextual collaboration: Astra gives you the opportunity to collaborate with a security expert to fix vulnerabilities that your developers might be stuck with.
  4. Video PoCs: On top of step-by-step guidelines, Astra’s security engineers add video PoCs to the pentest report to help you reproduce and fix vulnerabilities.
  5. Publicly verifiable certificate: On completion of the rescan after fixing the vulnerabilities Astra awards you a safe-to-do-business certificate that is publicly verifiable. While it is not a compliance certificate, it can prove crucial during a vendor review.
penetration testing companies in the UK cyber security auditors penetration test online Penetration testing services - continuous penetration testing

On top of these, Astra Security comes with vetted scans to ensure zero false positives. The scanner is optimizable for single-page apps and a bunch of different frameworks.

And it comes with a stellar dashboard that apart from making vulnerability management a breeze lets you control the website protection product as well.

Who is it for?
SaaS providers, ECommerce site owners, and public offices, across regions and industries.

What is best?

  • Connects with your CI/CD pipeline
  • Offers continuous scanning with regularly updated scanner rules
  • Ensures zero false positives
  • Helps with rapid prioritization and remediation of vulnerabilities

What could have been better?

  • Could have had more integration options
  • It doesn’t offer a free trial

It is one small security loophole v/s your entire website or web application

Get your web app audited with Astra’s Continuous Pentest Solution

2. Redscan


Key Features:

  • CREST qualified
  • Web application Pentesting
  • Breach and Attack Simulations
  • Threat Modeling

Redscan is a penetration testing company based out of the UK that has been in business for over ten years. They are one of the few companies to be ISO 27001 certified and have a Cyber Essentials certificate to their name.

They offer two types of penetration tests –

  • External Network Penetration Test: In this test, Redscan’s team attempts to exploit vulnerabilities in systems that are publicly accessible from the internet such as web applications, email servers, and DNS servers.
  • Internal Network Penetration Test: As the name suggests, Redscan’s team tries to identify vulnerabilities within systems and networks that can only be accessed from within an organization’s network perimeter. This usually includes file shares, print servers, and database servers.

Redscan employs a team of over 20 penetration testers that are all CREST qualified. The company is also one of the few to be PCI DSS compliant.

Who is it for?

The solution is perfect for companies in energy, fintech, healthcare, education, retail, and even media to test the security of their cyber assets.

What is best?

  • Reliable services from the tool.
  • Pentesting services for varied assets from web and mobile applications to networks, and cloud.

What could be better?

  • Pricing could be mentioned upfront.
  • Could have better testing and viewing options for smartphones and tablets.

3. Blaze


Key Features:

  • SaaS Pentesting
  • Web and Mobile Pentesting
  • Threat Modeling
  • Internal & External Pentesting

Blaze is a penetration testing company with a difference. The company was started by two former members of the UK’s National Cyber Security Centre (NCSC) – Andrew Rose and Will Dormann.

The company has a team of penetration testers that are all CREST-qualified and have experience working with some of the biggest names in the industry. Blaze also offers a range of other services such as red teaming, incident response, and digital forensics.

Blaze offers four types of penetration tests –

  • Web Application Penetration Test: In this test, Blaze attempts to exploit vulnerabilities in web applications such as cross-site scripting (XSS), SQL injection, and directory traversal attacks.
  • Network Penetration Test: As the name suggests, Blaze tries to identify vulnerabilities within network infrastructures such as routers, switches, and firewalls.
  • Wireless Penetration Test: In this test, Blaze attempts to exploit vulnerabilities in wireless networks such as WEP and WPA encryption attacks.
  • Physical penetration test: In this test, Blaze’s team attempts to gain physical access to a building or premises by bypassing security systems such as CCTV and alarm systems.

Who is it for?

The tool is apt for SMEs and large organizations like e-commerce businesses, healthcare organizations, Fintech, and banking all of which have various cyber and physical assets to pentest.

What is best?

  • The tool is well known for its customer service and attentiveness.
  • Reports are customized according to customer needs.

What could be better?

  • Pricing is not mentioned upfront.

4. Aardwolf security

aardwolf security

Key features

  • NCSC-certified penetration testers
  • ISO 27001 certified
  • Cyber Essentials Plus certificate
  • PCI DSS compliant

Aardwolf is one of the best UK penetration testing company. The company was founded in 2016 by two former employees of the UK’s National Cyber Security Centre (NCSC) – Alex Lomas and James Foster.

The pentesting company provides services for web, and mobile applications as well as networks and cloud platforms. Besides, this physical penetration testing UK provider also carries out ATM pentesting.

Other services include red teaming, social engineering, vulnerability assessments, firewall pentesting, and configuration reviews.

Who is it for?

This tool is ideal for financial organizations, companies with web and mobile applications, and others.

What is best?

  • The company provides physical pentesting for ATMs
  • Wide range of pentesting services.

What could be better?

  • Pricing could be mentioned upfront.

5. Breachlock


Key features:

  • Pentest on demand
  • Monthly automated scanning
  • Manual application pentest
  • OWASP-compliant web app scanning

Breachlock is a UK-based Penetration Testing as a Service company (PTaaS) of great repute. They offer continuous monitoring, web app pentest services, cloud security testing, and social engineering detection services.

Well-known among penetration testing service providers, Breachlock also offers a valuable vulnerability management program. It is a SaaS platform that allows you to request a pentest and after the penetration test is conducted you can avail of monthly scans through the same SaaS platform.

Breachlock’s team of ethical hackers conduct AI-augmented pentests giving you a comprehensive picture of your security posture. Accompanied by this is their fast remediation support as well as compliance readiness.

Who is it for?

The tool is best used by SMEs and even large organizations for vulnerability management.

What is best?

  • Continuous addition of risk checks
  • Scalable vulnerability management solution
  • Manual and automated testing options

What could be better?

  • Product support could be improved
  • Documentation can be confusing

6. Intruder


Key features

  • Vulnerability management
  • Tailored reporting
  • Integrations with popular bug trackers

Intruder is a dedicated vulnerability scanning tool with coverage across platforms. They also offer manual pentesting for an elevated price point. Intruder offers you a number of integrations. They have a decent user interface and they provide an actionable report.

It offers continuous vulnerability management, compliance reporting, and monitoring as well as attack surface monitoring.

Intruder is a scalable solution that’s flexible enough to scan websites for vulnerabilities, no matter the size or the industry your company belongs to.

Who is it for?

The tool is ideal for organizations of all sizes and industries.

What is best?

  • Easy to navigate.
  • Readily manageable alerts.

What could be better?

  • Could have better integrations. 
  • Confusing interface.
  • Zero false positives are not assured. 

Experience Astra Web Protection Yourself With Our 7 Day Free Trial!

Astra stops 7 million+ nasty attacks every month! Secure your site with Astra before it is too late.

7. Dhound


Key features:

  • Pentest on demand
  • Web application penetration testing
  • Network penetration testing
  • Social engineering

Dhound is a penetration testing company in UK that offers services such as web application penetration testing, network penetration testing, and social engineering. The company is based out of the UK and has a team of qualified penetration testers.

The company has experienced security consultants that help with pentesting, tech audits and assessments, phishing simulations, and more.

Who is it for?

It is ideal for businesses with web or mobile applications

What is best?

  • Provides executive and technical summaries for reports.
  • Comfortable user interface.

What could be better?

  • Solution can be a bit pricey.

8. CyberQ Group


Key Features:

  • Continuous breach detection service
  • Managed Security Operation
  • Cyber due diligence

CyberQ focuses on creating future-proof security solutions. Their goal is to build a platform that can successfully root out vulnerabilities from increasingly spread-out and public assets. They help with securing agile workforces and enabling digitization.

Best among penetration testing services in UK, this tool ISO27001-certified tool provides continuous threat and breach detection services as well as a managed security operations center.

CyberQ is also CREST-certified, ensuring protection 24/7 improving business risk profiles, and providing peace of mind.

Who is it for?

The tool is ideal for government agencies and private companies and other businesses.

What is best?

  • Has CREST certification
  • Provides actionable reports with insights.

What could be better?

  • Does not provide manual pentesting services.
  • No upfront pricing

9. Netsparker/Invicti


Key Features:

Netsparker now known as Invicti is one of the top pentesting companies in UK in the web application security market and has been around for quite a while.

Netsparker offers a powerful program with a bunch of interesting features like the ability to penetration test web applications deployed on cloud services.

This UK penetration testing company provides a powerful, highly accurate, automated web app vulnerability scanner. It is the de-facto standard for detecting, locating, and reporting application security risks.

It can be used to scan any web application regardless of the technology stack or development framework used.

Who is it for?

It is ideal for developers, auditors, and security professionals to improve the security of web applications.

What is best?

  • A lot of options to select security policies from
  • IAST enabled scans
  • Zero false positives

What could be better?

  • No support for 2FA and MFA apps
  • Slows down while scanning large applications

10. Acunetix


Key Features:

  • Web Application Security
  • Vulnerability Management
  • Compliance Reporting

Acunetix is a software company that provides web application security solutions. The company’s flagship product, Acunetix WVS, is a web vulnerability scanner that can be used to scan websites for SQL injection, XSS, and other vulnerabilities.

It promises 90% scan results by the time the scan is halfway completed. It also allows the scanning of multiple environments as well as the prioritization of vulnerabilities.

Its key features include the ability to pinpoint vulnerability locations, and optimization for script-heavy sites among others. Acunetix is a good choice among the best pentesting companies in London for windows. 

One of the best parts of its service offerings is that it shows you the exact lines of code that need to be fixed in order to get rid of a vulnerability.

Who is it for?

Large organizations in any industry.

What is best?

  • Time release of updates
  • Can find a wide array of vulnerabilities.
  • Agile testing with detailed reports

What could be better?

  • Does not provide expert remediation assistance with professionals.
  • Does not ensure zero false positives.
  • Pricing is not mentioned.
  • Dated user interface with scope for improvement.

How does a penetration testing company work?

The penetration testing process is designed to find vulnerabilities in your system before an attacker does. It simulates real-world attacks so you can identify and fix weaknesses before they’re exploited.

When you hire a penetration testing company in UK, they follow a mostly similar methodology to detect vulnerabilities in your systems.

They apply a combination of automated scans and manual probing to find and exploit vulnerabilities to help you understand the risk associated with each vulnerability.

Penetration testing methodology

Reconnaissance: The first stage of the attack where the pentester gathers information about the target system.

Scanning: The second stage is where the pentester uses automated tools to identify potential vulnerabilities.

Gaining Access: The third stage is where the pentester tries to exploit the vulnerabilities they’ve found to gain access to the system.

Maintaining Access: The fourth stage is where the pentester attempts to maintain their access and create a backdoor for future access.

Covering Tracks: The final stage is where the pentester attempts to clean up their tracks and cover their tracks so as not to be detected.

What makes penetration testing important for your business?

There are many reasons why penetration testing is important for your business. Here are some of the most common ones:

Security posture management:

Penetration testing can help you understand your security posture and identify areas for improvement.

Risk management:

By identifying and prioritizing vulnerabilities, penetration testing can help you manage risk more effectively.


Many regulations and standards require penetration testing as part of your compliance program.


In the event of a breach, demonstrating that you’ve taken steps to secure your systems can help limit damage to your reputation.

Why is it important to choose the right penetration testing company in UK?

Security audits and penetration testing are naturally feared by organizations often more than the cyber attacks these are designed to stop.

There are many reasons behind this.

A pentest process can be long, tiring, and expensive. It often involves human hours put in by the employees of the target company. That cannot be good news for business. Moreover, the mail trail that follows the pentest is often long enough to confuse the developers trying to fix the issues.

Pentest customers are often thrown into further darkness after the pentest.

With the right penetration testing service, you can go through the pentest process without facing any of the issues. The right penetration testing company will be attentive to your specific needs, provide you with a solution that is easy to use and navigate and help you with the interpretation of the report and execution of the fixes.

5 Things To Look For In A Penetration Testing Company

When looking for a penetration testing company in UK, here are some of the things you should look for:

1. Should be a self-served, easy-to-navigate tool

A good pentest company will offer a self-serve tool that is super easy to navigate and minimizes the effort required from the users.

2. Should have manual pentest capabilities

The company should also have manual pentest capabilities to supplement the automated scans. The manual scans are not supposed to replace the automated scanners but to augment their capabilities and validate the results.

3. Should provide actionable reports with vulnerability prioritization

The report should be actionable and easy to understand. It should also include remediation steps and risk scores based on contextual data for easy prioritization of vulnerabilities. Some UK penetration testing companies go ahead and include video PoCs to reproduce the vulnerabilities to make the task easier for developers.

4. Should provide thorough remediation support

When we say thorough remediation support, we mean easily navigable guidelines, video PoCs, and in-chat or in-call assistance from security experts.

5. Publicly verifiable pentesting certificate

Once you have fixed all the vulnerabilities indicated by the pentest company and produced evidence for the same in the re-scans, the pentest companies should give you a publicly verifiable certificate that declares you secure at that point in time. Please note that this is not equivalent to a compliance certificate.

It is one small security loophole v/s your entire website or web application

Get your web app audited with Astra’s Continuous Pentest Solution


Penetration testing is important for your business. It helps you manage your security posture, assess risk, and ensure compliance. When choosing a penetration testing company, look for one that offers self-serve tools, manual pentesting capabilities, actionable reports, and thorough remediation support. With features like that, you cannot go wrong.

Saumick Basu

Saumick is a Technical Writer at Astra Security. He loves to write about technology and has deep interest in its evolution. Having written about spearheading disruptive technology like AI, and Machine Learning, and code reviews for a while, Information Security is his newfound love. He's ready to bring you along as he dives deeper.
Notify of

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Inline Feedbacks
View all comments

Psst! Hi there. We’re Astra.

We make security simple and hassle-free for thousands
of websites and businesses worldwide.

Our suite of security products include a vulnerability scanner, firewall, malware scanner and pentests to protect your site from the evil forces on the internet, even when you sleep.

earth spiders cards bugs spiders

Made with ❤️ in USA France India Germany