Penetration Testing Companies UK

Many providers sell penetration testing in the UK, and they don't all work the same way. This page compares four types that you will meet, the situations each suits, and the checks to apply to any provider you shortlist.

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Accreditations and memberships

Four Provider Types

How the main types of provider compare

These are general patterns, not claims about any named provider, and individual providers vary on their capabilities and deliverables. Exploitr is a boutique consultancy with our own in-house portal, and also offers consultant-led PTaaS, so those two columns describe us, limits included.

What to consider	Boutique consultancy	PTaaS platform	AI-augmented provider	Large firm
Who does the testing	Usually a small team of senior consultants, often the person you scoped the work with.	A mix of platform tooling and human testers. The balance varies widely.	Tooling does part of the work, with a person directing and checking it. How much varies.	A team assigned from a larger pool. The person who sold the work may not be the one doing it.
How it is priced	Often a fixed price or a day rate for a defined scope.	Usually a subscription, sometimes tiered by testing volume.	Often lower on suitable scopes. Pricing models vary.	Often day rates or fixed prices from templated scoping, with formal procurement terms.
Reporting and support	Debrief and follow-up questions usually go to the consultant who tested.	Findings appear in a portal as testing progresses, usually with retests requested there.	Reports can be produced faster, or may be entirely generated. Check how much of the report a person has reviewed.	Formal reporting and account structures. Questions may go through an account manager.
Best suited to	A defined scope where you want direct access to the tester.	Frequent releases and ongoing coverage.	Well-defined scopes where speed and cost lead, and you are comfortable with how your data is handled.	Multi-site programmes and formal supplier requirements.

Which Type Suits You

Matching the type of provider to your situation

No provider is right for every buyer. These are the situations we hear about most, and the type that usually suits each.

You have an audit or customer deadline

A boutique consultancy or a large firm suits a defined scope, provided the start date and report turnaround are confirmed in writing. Count back from your deadline and leave room for remediation and retesting. See our guidance on penetration testing for compliance.

You release software frequently

A PTaaS model, from a platform or a consultancy, gives testing that follows your release cadence. Check how much of the testing is manual. See our PTaaS service.

It is your first penetration test

A boutique consultancy can provide a more personal consultancy. Use a scoping call to see whether the provider asks about your environment, rather than selling a package. See our guide to scoping your first pentest.

You run a multi-site or multinational programme

A large firm often has greater capacity and diverse capabilities. Ask who will be on your engagement, and who you will speak to when you have a question following an engagement.

Budget leads the decision

AI-augmented and platform-based providers can often cost less on suitable scopes. Check what a person does and what the price includes. Our pentest pricing guide shows what drives cost for human-led penetration testing.

Shortlist Checklist

Seven checks to apply to any provider

Whichever type you choose, these checks tell you more than the type does. Each links to the part of our buyer's guide that explains it.

Is the company accredited for the service you are buying?

Check the claim on the accreditation body's own listing, and confirm the accredited service matches what you need. See CREST penetration testing explained.

Who will do the testing, and is any of it subcontracted?

Ask for the consultant's name and certifications before you sign, and get the answer on subcontracting in writing. See who is actually performing the testing.

Is the scope explicit?

Assets, user roles, exclusions, rules of engagement and what you need to provide should all be in the proposal. See reading the proposal as a commitment.

How is the price structured?

Day rate, fixed price for a set number of days, or fixed price for a fixed scope each put the risk in a different place. See how the price is structured.

Can you see a sample report?

Review the content rather than the formatting: scope, an executive summary for the right audience, tailored findings and reproduction steps. See asking for a sample report.

What happens after the report?

Ask about the debrief, retesting and who answers your developers' questions. See what happens after the report is delivered.

How is your data handled?

Ask about insurance, NDAs, where testing data is stored and for how long, and which sub-processors are involved. See the commercial and data-handling checks.

Why we don't rank providers

Many lists of the best penetration testing companies are written by providers, and the author usually places itself near the top. We haven't ranked anyone on this page, including ourselves.

A ranking says little about whether a provider suits your scope, your deadline or your budget. The comparison and checklist above do, because they apply to every provider you are considering.

Frequently Asked Questions

Comparing penetration testing companies

Questions buyers ask when building a shortlist.

Two or three comparable quotes is usually enough to see the range. Make sure they align on scope, user roles, testing days and deliverables before you compare prices, because two quotes for the same label can describe different work. Our buyer's guide covers comparing proposals like for like.

Only if your buyer, contract or framework names it. CREST accreditation tells you an independent body has checked the provider's processes and data handling, but it doesn't tell you who will test your systems. See CREST penetration testing explained for how it compares with CHECK and the Cyber Scheme.

Size gives capacity and formal process. It doesn't tell you who will test your systems or how much of the work is done by hand. Ask the same questions of every provider, whatever their size.

Yes. Many providers combine types, for example a consultancy that also runs a platform, as we do with PTaaS. Judge each service on what you are buying and how it is delivered.

Comparing providers for your penetration test?

Tell us what you need to test, and we'll reply within one business day to confirm the scope, then send a fixed-price proposal. No obligation at any stage.

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