If you’ve been evaluating software vendors for any length of time, you’ve run into both acronyms — sometimes on the same company’s website, sometimes just one or the other. They get treated as interchangeable “security badges,” but they’re built differently, tested differently, and answer slightly different questions. Knowing the difference makes vendor evaluation faster and more accurate.
What Each One Actually Is
SOC 2 is an attestation — a report written by an independent CPA firm stating an opinion on whether a company’s controls meet the AICPA’s Trust Services Criteria (Security, Availability, Processing Integrity, Confidentiality, Privacy). It’s most common among U.S.-based SaaS and technology companies, largely because U.S. enterprise buyers ask for it by default.
ISO 27001 is a certification — issued after an accredited certification body audits a company’s Information Security Management System (ISMS) against an international standard. It’s broader in scope than a single system or product; it certifies the management framework a company uses to identify risks and manage security across the whole organization. It’s the more globally recognized standard, especially outside the U.S.
The Core Difference: Report vs. Certificate
This is the distinction that trips people up. A SOC 2 engagement produces a report — a narrative document, often 40–80 pages, with a stated opinion, a description of the systems in scope, and detailed testing results. An ISO 27001 engagement produces a certificate — a shorter, standardized document confirming the company’s ISMS meets the standard, valid for three years with required annual surveillance audits in between.
In practice, that means a SOC 2 report gives you more granular detail about what was actually tested, while an ISO 27001 certificate gives you a simpler pass/fail signal backed by an internationally recognized accreditation body.
Type 1 vs. Type 2 Has No ISO 27001 Equivalent
SOC 2 draws a hard line between Type 1 (design only, single point in time) and Type 2 (design and operating effectiveness, tested over months). ISO 27001 doesn’t have this distinction in the same way — a certification audit assesses whether the ISMS is both properly designed and functioning, and the ongoing three-year cycle with annual surveillance audits is what provides continuity, rather than a stated observation window like SOC 2 Type 2 has.
Which One Should Your Vendor Have?
The honest answer: it depends on who you’re asking and where they’re selling.
- If your vendor sells primarily to U.S. enterprises, SOC 2 Type 2 is the more commonly requested standard, and its detailed, evidence-based structure is genuinely useful for security teams doing deep vendor review.
- If your vendor operates internationally or serves customers in Europe, Asia, or the Middle East, ISO 27001 carries more weight, since it’s the standard most non-U.S. procurement teams recognize and require.
- Many mature vendors eventually pursue both, since the underlying controls overlap significantly and the second framework becomes much less work once the first is in place.
Neither framework is inherently “better” — they’re built for different audiences and different regulatory contexts. What matters is whether the one your vendor holds is actually current, actually verified by an accredited third party, and actually covers the systems you’re trusting them with.
What to Ask Regardless of Framework
However a vendor answers “SOC 2 or ISO 27001,” the follow-up questions are the same:
- Is the report or certificate current, or expired?
- Which systems, products, or business units does it actually cover?
- Who performed the audit or certification, and are they accredited to do so?
- Can you request the underlying document (report or certificate) to verify directly, rather than relying on a badge?
A vendor confident in either framework will answer all four without hesitation.
Curious which framework fits your own vendor stack, or want a plain-language second opinion on a report or certificate you’ve received? Reach out — we’re happy to help.
