Dionach vs Aristi
Side-by-side comparison of Dionach and Aristi for penetration testing services. Compare their services, accreditations, compliance expertise, and pricing.
This is one of the tightest matchups in our directory. Both providers score within a few points of each other, so the decision here comes down to specific needs rather than overall quality. Both hold CREST accreditation, but their credentials diverge beyond that — Dionach additionally carries STAR and PCI QSA, while Aristi holds Cyber Essentials and Cyber Essentials Plus. From a delivery standpoint, Dionach operates globally from Oxford, while Aristi operates at a national level out of Birmingham. This matters for on-site testing, time zone alignment, and regional regulatory knowledge. There's a meaningful size gap: Dionach (51-200 team) brings deeper bench strength and capacity for concurrent engagements, while Aristi (11-50 team) offers the smaller firm advantage of senior-led engagements and direct access to principal consultants.
| Dionach | Aristi | |
|---|---|---|
| Headquarters | Oxford, United Kingdom | Birmingham, United Kingdom |
| Founded | 1999 | 2008 |
| Team Size | 51-200 | 11-50 |
| Pen Testers | — | — |
| Geography | Global | National |
| Markets | UK, Europe, North America, APAC, Global | UK |
| Pricing | — | — |
| Services | Web ApplicationNetworkRed TeamingPurple TeamingSCADA/ICSVulnerability AssessmentCloudAPIMobile AppConfiguration ReviewSocial Engineering | Web ApplicationNetworkMobile AppCloudAPIRed TeamingSocial EngineeringPhysicalVulnerability AssessmentConfiguration ReviewSCADA/ICS |
| Accreditations | CRESTCHECKSTARISO 27001PCI QSANCSC Assured | CRESTCHECKISO 27001Cyber EssentialsCyber Essentials PlusNCSC Assured |
| Compliance | PCI DSSISO 27001GDPRNIS 2DORANIST CSF+1 | ISO 27001GDPRCyber EssentialsPCI DSSNIS 2NIST CSF |
| Best For | EnterpriseGovernmentCritical Infrastructure | GovernmentCritical InfrastructureEnterpriseMid-Market |
| Methodologies | OWASP, CREST, NIST, CBEST, STAR | OWASP, CREST, NIST, CBEST |
Shared Services (10)
Only Dionach (1)
Only Aristi (1)
Comparison FAQs
How does Dionach compare to Aristi?+
Dionach is headquartered in Oxford, United Kingdom and offers 11 services. Aristi is based in Birmingham, United Kingdom with 11 services. Both providers offer 10 services in common.
Which provider has more accreditations?+
Dionach holds 6 accreditations (CREST, CHECK, STAR, ISO 27001, PCI QSA, NCSC Assured), while Aristi holds 6 (CREST, CHECK, ISO 27001, Cyber Essentials, Cyber Essentials Plus, NCSC Assured).
What services are unique to each provider?+
Dionach uniquely offers: Purple Teaming. Aristi uniquely offers: Physical.
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