Find the vulnerabilities before attackers do.
Fixed-price, expert-led web application penetration tests aligned to OWASP & PTES. Manual exploitation by CREST-, OSCP- and OSWE-certified testers, with a developer-ready report in days — not weeks.
Complete coverage of your attack surface
Every engagement is a hands-on, manual assessment — automated scanning only confirms what real testing already found.
Authentication & sessions
Login flows, MFA, password reset, JWT and session handling — tested for bypasses, fixation and account takeover.
Access control & IDOR
Horizontal and vertical privilege escalation, insecure direct object references and broken multi-tenant isolation.
Injection & XSS
SQL injection, command injection, SSTI, and stored / reflected / DOM cross-site scripting across every input.
APIs & GraphQL
REST and GraphQL endpoints tested for broken object-level authorization, mass assignment and excessive data exposure.
Business logic
Workflow abuse, race conditions, price/quantity tampering and the flaws automated scanners can never find.
Configuration & infra
Security headers, TLS, CORS, file upload, SSRF and exposed services in the application's hosting stack.
A clear, repeatable process
No black boxes. You know exactly what happens at each stage of the engagement.
Scope
We agree targets, accounts and rules of engagement, then issue a fixed-price quote.
Recon
Mapping the application, endpoints, roles and technologies to plan the attack.
Test & exploit
Manual exploitation of every finding to prove real, demonstrable impact.
Report
Severity-rated findings with clear reproduction steps and remediation guidance.
Retest
Once you've fixed the issues, we re-test and confirm — included free.
Trusted by engineering teams
What clients say after working with us on their web application security.
We needed a pen test to close an enterprise deal and had a tight deadline. They scoped it the same day, delivered in under a week, and the executive summary was exactly what our client's security team wanted to see.
Head of Engineering, fintech startup
Very knowledgeable, flexible and responsive. Pleasure working with Vesperis Security and will certainly be working with them again. They are true professionals.
London, GB
Vesperis Security delivered a really great report — clear, well-structured, and easy to act on. Communication throughout was smooth and professional. Highly recommend.
Guildford, GB
When you need a penetration test
Most clients come to us with one of these four deadlines. If any sounds familiar, we can usually scope you in within a day.
Closing an enterprise deal
A prospect's security questionnaire asks for a recent pen test report. We deliver an executive summary their security team will accept — often the last blocker before signature.
Facing a questionnaire deadline? Get scoped today →Compliance & certification
SOC 2, ISO 27001 and PCI DSS all expect regular penetration testing — our reports slot straight into your audit evidence and give auditors and customers independent assurance that your application has been tested to a professional standard.
Audit coming up? Tell us your deadline →Before a major launch
New product, big feature or replatform going live? Test before launch, fix on your schedule — not after an incident forces the timeline.
Launching soon? Get your fixed price →After an incident or near-miss
Something suspicious happened and you need assurance. We test the application the way a real attacker would and verify your fixes hold.
Need answers fast? Talk to us →Transparent, fixed pricing
£1,000 per web application — with automatic volume discounts the more applications you test. No hidden day rates. Launch offer: 50% off every quote below.
Build your quote
Drag to choose how many web applications you need tested.
One web application, tested end to end — at the 50% launch price.
- Full OWASP / WSTG manual test
- Severity-rated report with PoCs
- Remediation guidance
- One free retest of fixes
3–5 applications: 10% volume discount + 50% launch offer.
- Everything in Single app
- 10% off every application
- Priority scheduling
- Consolidated portfolio report
6+ applications or continuous testing: 15% discount + 50% launch offer.
- 15% off every application
- Dedicated lead tester
- Priority scheduling & SLAs
- Custom scope & reporting
Automated scan vs. manual penetration test
Automated scanners are fast, inexpensive and genuinely useful for catching known, surface-level issues — you should run them. But they work from signatures and can't reason about how your application actually behaves. That's where a manual test earns its place:
| Capability | Automated scan | Manual penetration test |
|---|---|---|
| Manual exploitation of findings | Not performed | Yes |
| Business-logic & broken access control (IDOR) | Usually missed | Core focus |
| False positives filtered out for you | You triage them | Done for you |
| Proof-of-concept for each finding | Rarely | Every finding |
| Remediation guidance for your developers | Generic | Tailored to your stack |
| Executive summary for audits & questionnaires | Not produced | Included |
| Retest to confirm your fixes | Not included | Included |
More than a vulnerability scan
Manual, expert-led testing
Real testers exploiting real issues — not just a scanner report rebadged.
Executive & technical report
A summary for stakeholders and detailed, reproducible findings for engineers.
Risk-rated findings
Every issue scored by severity and business impact so you fix what matters first.
Remediation guidance
Clear, actionable fixes — and we're available to clarify after delivery.
Free retest of fixes
Once you've remediated, we verify the fixes and update the report at no extra cost.
Confidentiality
NDAs signed on request. Your data and findings are handled securely and never shared.
Common questions
A single application with one primary domain and a defined set of user roles. Large applications with many distinct modules, or separate admin/customer portals, may be scoped as more than one — we confirm this during scoping before any charge.
Every engagement is delivered by hands-on, industry-certified testers. Our team holds the CREST Registered Penetration Tester (CRT) qualification alongside Offensive Security's OSCP and OSWE — so your application is assessed against a recognised professional standard, not run through an off-the-shelf scanner.
A typical single application takes 5–7 working days from kick-off to report delivery. Larger or multi-application engagements are scheduled around your release timeline.
Yes — we'll send a redacted sample report on request so you can see exactly what you'll receive before spending a penny. It shows how we write up findings: an executive summary for stakeholders, severity-rated issues with clear reproduction steps, proof-of-concept evidence and practical remediation guidance your developers can act on straight away. Just email us or ask in your quote request and we'll share one.
As we build out our client portfolio, we're offering 50% off every web application penetration test — and it stacks on top of the volume discounts. The price shown in the calculator already reflects it. It's introductory pricing for a limited time, so the rate is locked in once we've agreed scope.
Pricing is tiered by total applications in the engagement: standard rate for 1–2 apps, 10% off for 3–5, and 15% off for 6 or more. The calculator above applies this automatically.
Yes. Once you've remediated the findings, we re-test the affected issues and reissue the report confirming their status — included in the original price.
Absolutely. We routinely work under client NDAs and can sign yours, or provide our standard mutual NDA, before any scoping details are shared.
No. We test carefully and non-destructively by default, and agree any potentially disruptive checks with you in advance. Testing can run against a staging environment or within a scheduled window that suits you — the goal is to find issues without ever causing one.
Confidentially, and on a least-privilege basis — we only ask for the access the test actually needs. Any credentials, data and findings are stored securely for the duration of the engagement and removed on request once the report is delivered. Everything is covered by NDA.
That's a good result — and you still receive a full report documenting exactly what was tested and confirming your application's security posture. It's an attestation you can share with customers, auditors or a prospect's security team. You're paying for the assurance and the evidence, not just a list of bugs.
Request your quote
Tell us a little about your application and we'll reply with a fixed-price scope — usually within one business day. No sales calls unless you want one.
Prefer email? Reach us directly at [email protected] — it's the surest way to get a fast reply. If our response doesn't arrive, please check your spam or junk folder.