Comparison

SOC 2 vs ISO 27001

SOC 2 is a US attestation report; ISO 27001 is an international management system certification. Both prove security maturity to enterprise buyers but the philosophies differ — SOC 2 is point-in-time control evidence, ISO 27001 is an ongoing information security management system (ISMS). Most SaaS picks one based on geography first.

SOC 2

AICPA SSAE 18 attestation by a US CPA firm. Tests controls against the Trust Services Criteria. Type 1 = point-in-time; Type 2 = period (3-12 months).

Who needs it
US-focused SaaS
Authority
AICPA / CPA firms
Issued as
Attestation report (CPA opinion)

ISO 27001

International standard for an Information Security Management System (ISMS). Certified by accredited registrars. Three-year cert with annual surveillance audits.

Who needs it
EU / international-focused SaaS, enterprise vendors
Authority
ISO/IEC, accredited registrars (BSI, TÜV, etc.)
Issued as
Certificate

Similarities

  • Both demonstrate enterprise-grade security to procurement teams.
  • Substantial control overlap — encryption, access management, change management, incident response.
  • Both require risk assessment, documented policies, workforce training, and management oversight.
  • Both produce auditor-mappable evidence; many tools support both.

Where they differ

AxisSOC 2ISO 27001
GeographyPrimarily USInternational / EU-favored
OutputReport (with opinion)Certificate
Framework typeControl attestationManagement system (ISMS)
ScopeService organizationISMS scope (you define it)
Renewal cycleAnnually (Type 2)3-year certification + annual surveillance + 3-year recertification
Cost (auditor)$5k–$50k$15k–$60k initial; $5k-$15k surveillance
Customer recognitionHigh in USHigh in EU, high in international enterprise

Which do you need?

Pick SOC 2 if…

Your customers are in the US and procurement asks for "your SOC 2."

Pick ISO 27001 if…

You sell in Europe, Asia, or to multinationals where ISO certifications are the lingua franca.

Pick both if…

You sell globally to enterprise. Many tools and auditors offer a combined SOC 2 + ISO 27001 program at modest incremental cost.

Pick SOC 2 first if…

You're US-headquartered. Faster to first sale; ISO can follow once you have customers in EU.

Frequently asked

Is ISO 27001 harder than SOC 2?
Different harder. ISO requires a management system (continuous risk assessment, internal audit, management review). SOC 2 requires the controls themselves. Many teams find ISO's management-system burden larger in calendar time; SOC 2's technical control burden larger in eng time.
Can I reuse evidence between them?
Yes — ~70% of evidence is reusable. Mature programs run both on a shared evidence platform.
Does KollGuard cover ISO 27001?
Yes via crosswalk from SOC 2 / HIPAA technical controls. We're explicit about it. Native ISO 27001 assertion requires a registrar-recognized ISMS — that's beyond tool scope.
Type 1 SOC 2 vs Stage 1 ISO audit?
Loosely analogous: both are readiness assessments before the full evaluation (Type 2 / Stage 2 + certification audit). The shape is similar; the methodology is different.

Related comparisons

Scan against both at once

KollGuard maps every finding to 12 frameworks — including SOC 2 and ISO 27001.