The short answer
The short answer depends on who is asking. ISO 27001 is an international standard for an information security management system. Certification proves your organization runs a repeatable security program. SOC 2 is an attestation report from a CPA firm about controls at a service organization. It speaks to how you protect customer data for a defined system.
For most growing software companies, sales sets the order. If buyers send security questionnaires and ask for a SOC 2 report, start there. If enterprise buyers, public sector tenders or global customers ask for ISO 27001 certification, put ISO first. If both appear in the same quarter, build one control set and map it to both.
Do not treat them as rivals. They overlap on access control, change management, incident response, vendor management and backups. The difference is the wrapper: a management system and certificate on one side, an auditor's report on the other. Pick the wrapper your customers recognize, then reuse the evidence.
| Aspect | ISO 27001 | SOC 2 |
|---|---|---|
| Primary output | Certificate from an accredited certification body. | Attestation report from an independent CPA firm. |
| Governing framework | ISO/IEC 27001 standard and its Annex A controls. | AICPA Trust Services Criteria. |
| Scope | The ISMS, with a defined scope across the organization, products, sites and suppliers. | A defined system or service and the criteria selected for the report. |
| Audit path | Stage 1 readiness review, Stage 2 certification audit, then surveillance and recertification. | Auditor examination of management's assertion and controls for the report period or point in time. |
| Customer signal | Global enterprise, public sector and buyers who ask for certification. | Software buyers, security questionnaires and procurement teams that ask for a SOC 2 report. |
| Public access | Certificate is usually public. | Report is confidential and shared under NDA. |
| Renewal | Surveillance audits and periodic recertification. | New report for each period customers require. |
| Control selection | Annex A controls with risk treatment and a Statement of Applicability. | Common security criteria plus optional availability, processing integrity, confidentiality and privacy. |
How ISO 27001 works
ISO 27001 asks you to define an information security management system, or ISMS. You set the scope, identify risks, decide how to treat them and record the result in a risk register and a Statement of Applicability. Annex A gives control themes across organizational, people, physical and technological areas. You justify inclusions and exclusions rather than copying every control.
The work is management heavy. You need an information security policy, named roles, an asset inventory, supplier reviews, incident procedures, business continuity tests, internal audit, management review and corrective actions. Evidence must show the system runs, not just that documents exist. A risk assessment that no one updates will fail scrutiny.
Certification comes from an accredited certification body. Stage 1 checks readiness and documentation. Stage 2 tests implementation. After certification you face surveillance audits and a recertification cycle. The certificate is public, which helps in procurement. The scope statement matters: a narrow scope can leave out parts of the product customers care about.
How SOC 2 works
SOC 2 uses the AICPA Trust Services Criteria. Security is the common criterion. Availability, processing integrity, confidentiality and privacy are optional. You choose the criteria that match customer promises and the system description. The auditor tests your controls and issues a report, not a certificate.
The report includes management's assertion, a system description and the auditor's opinion. Customers read the system description to learn boundaries, components, incidents and complementary user entity controls. Good reports are specific. Vague control descriptions create follow-up questions and can weaken the report's value.
Scoping is the main decision. Define the system, the services, the infrastructure, the people and the vendors in scope. Decide how to treat subservice organizations, with a carve out or inclusive method. Collect evidence across the report period: access reviews, change tickets, backup tests, monitoring alerts and incident records. A report can cover a point in time or a period, and the period adds evidence work.
When to choose ISO 27001
Choose ISO 27001 when customers ask for certification, not just a report. This is common in global enterprise sales, public sector procurement and markets where an accredited certificate carries weight. It also fits companies that need one security system across several products, offices and legal entities.
It suits a company that wants a risk based program with clear ownership. The ISMS forces regular risk review, supplier oversight and management review. That rhythm helps as headcount grows and engineering teams split into smaller groups.
Watch the commitment. Certification involves two audit stages, surveillance audits and recertification. You need a management sponsor, a control owner group and time for internal audit. If your buyers only ask for a SOC 2 report, ISO 27001 may add overhead before it adds sales.
When to choose SOC 2
Choose SOC 2 when software buyers ask for a security report and your sales cycle stalls without one. It fits SaaS companies that host customer data and need to show controls over a defined service. The report is easier for a US procurement team to read because it follows a familiar CPA format.
It also fits a company that wants to start with the service customers buy. You can scope the report to the product, the supporting infrastructure and the shared services that matter. That focus keeps effort tied to revenue instead of the whole company.
Watch auditor independence and evidence quality. Do not write controls to match a tool. Write controls that match how work happens, then collect evidence. Confirm which criteria customers expect and how they want to receive the report, usually under NDA. Do not call SOC 2 a certification.
Costs and effort to consider
Compare effort before fees. ISO 27001 needs a management system, internal audit, management review and ongoing risk work. SOC 2 needs control operation and evidence for the report period. Both need engineering time for access management, logging, backups, change control and vendor reviews.
External fees follow scope. Certification bodies charge for stage 1, stage 2, surveillance and recertification. CPA firms charge for the report period, the number of criteria and the systems in scope. Ask for a written quote that lists what is included and what triggers extra work. Confirm report distribution terms and whether a bridge letter is available.
Internal cost is usually larger than the invoice. Policy reviews, access reviews, ticket hygiene, training and evidence collection take hours from people who have product work. A compliance platform can help, but it will not operate controls for you. Budget for remediation, not just documentation.
If you want a fixed price starting point, the Cloudverg SOC 2 readiness assessment is $7,500 and covers scoping, a gap assessment against the Trust Services Criteria, a policy and evidence inventory, a remediation roadmap and a shortlist of CPA firms. Other options include hiring an independent consultant, using a compliance platform with a template library, or running the gap assessment yourself. Choose based on how much internal discovery you can absorb.
Frequently asked questions
Is SOC 2 the same as ISO 27001?
No. ISO 27001 certifies a management system. SOC 2 reports on controls at a service organization against the Trust Services Criteria. They overlap in control areas but differ in output and audience.
Can a company get both ISO 27001 and SOC 2?
Yes. Build one control framework, map it to Annex A and the Trust Services Criteria, then collect evidence once where possible. Keep separate scopes and owners because the audit cycles and report periods differ.
Which one should a startup do first?
Ask your buyers. If they send a SOC 2 request, start there. If they require an ISO 27001 certificate for procurement, do ISO 27001. If both are unclear, run a gap assessment before committing to an audit.