If you're selling software to enterprise customers, you'll eventually be asked about one or both of these frameworks. They serve similar goals but differ in structure, audience, and what "passing" actually means.
ISO 27001: a certifiable management system
ISO 27001 certifies that you have an Information Security Management System (ISMS) — a formal, ongoing process for identifying risks and applying controls to address them. It's an international standard, and certification is issued by an accredited body after an audit against the standard's requirements (and Annex A controls).
Key characteristic: it certifies the process of managing security risk, not just a fixed set of controls.
SOC 2: an attestation report, not a certification
SOC 2 is not a certification — it's an attestation report produced by a licensed CPA firm, describing whether your controls meet the criteria in the AICPA's Trust Services Criteria (security, availability, processing integrity, confidentiality, privacy). You choose which criteria apply to you beyond the mandatory "security" category.
Key characteristic: it's a report you show customers, not a badge you display, and it's most commonly requested by US-based enterprise buyers.
Type I vs Type II (SOC 2 specific)
- Type I — controls are suitably designed at a single point in time.
- Type II — controls are both designed and operating effectively over a period, typically 6–12 months.
Most enterprise buyers will only accept a Type II report.
Which should you pursue first?
If your customer base is primarily US enterprise SaaS buyers, SOC 2 is usually requested first. If you're expanding internationally or your buyers are in regulated industries in Europe or APAC, ISO 27001 becomes more relevant. Many growth-stage companies pursue SOC 2 Type II first, then layer ISO 27001 on top using the same underlying control set.
The overlap that matters for engineering teams
Both frameworks care about access control, change management, vulnerability management, incident response, and encryption. If you build strong technical controls once — proper least-privilege access, audit logging, vulnerability scanning in CI/CD — you're most of the way toward either framework, or both.