What is CSA STAR and how does it relate to SOC 2?
CSA STAR is the Cloud Security Alliance's cloud-specific assurance program, built on its Cloud Controls Matrix. It complements SOC 2 rather than replacing it; STAR Level 2 can accompany a SOC 2 exam from the same CPA firm.
The full answer
CSA STAR stands for the Cloud Security Alliance's Security, Trust, Assurance and Risk program. It is built around the CSA Cloud Controls Matrix, a cloud-specific control framework, and its companion questionnaire. STAR is aimed squarely at cloud service providers and is well recognized by buyers evaluating cloud risk.
STAR has tiers. Level 1 is a free self-assessment you publish to the CSA registry. Level 2 is a third-party assessment — and this is where it meets SOC 2. A licensed CPA firm can perform a "SOC 2 + STAR" examination, mapping the Cloud Controls Matrix onto the SOC 2 Trust Services Criteria so one engagement produces both. Higher, continuous-assurance tiers also exist.
So the relationship is complementary, not competitive. SOC 2, under the AICPA's SSAE No. 18 standards, is an attestation by a CPA firm; STAR Level 2 layers a cloud-specific control mapping on top. If your buyers already accept SOC 2, adding STAR mostly signals cloud maturity and gets you listed in the public CSA registry.
Practically, most startups start with SOC 2 and add STAR Level 2 as a bolt-on if cloud customers ask for it. SOC 2 audits booked through the AuditNex network start at $2,500 promotionally and average about $5,000, against a typical US range of $5,000 to $60,000+ depending on scope, per published pricing guides from Vanta, Drata, and Secureframe. Ask whether your auditor can issue the combined report.
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Related questions
Can one audit firm do SOC 2 and ISO 27001 together?
Often yes, if the firm holds both a CPA license for SOC 2 and ISO 27001 accreditation, or partners with an accredited certification body. Many providers now run a combined audit that shares evidence and fieldwork to save time.
Do I need both SOC 2 and ISO 27001?
Usually not at first. Most US startups start with SOC 2 to close deals; ISO 27001 matters more for international or enterprise buyers. Many companies eventually hold both because auditors can reuse overlapping evidence.
Do government buyers accept SOC 2?
Sometimes. State and local agencies and government contractors often accept a SOC 2 Type 2, but most federal cloud work requires FedRAMP, and defense contracts increasingly require CMMC. SOC 2 helps, yet rarely replaces those government-specific programs.
Does PCI DSS overlap with SOC 2?
Yes, they share many technical controls — access management, encryption, logging, and vulnerability management — but they don't substitute for each other. PCI DSS is a prescriptive, mandatory standard for handling cardholder data; SOC 2 is a flexible CPA attestation.
Does SOC 2 cover AI and LLM features?
Yes, indirectly. SOC 2 has no AI-specific criteria, but its technology-neutral Trust Services Criteria cover any system in your defined scope — including AI and LLM features — for security, availability, confidentiality, processing integrity, and privacy.
Does SOC 2 help with GDPR?
Partly. SOC 2 is not a GDPR certification, but a report with the confidentiality and privacy criteria demonstrates many security safeguards the GDPR expects. You still need GDPR-specific steps like lawful basis, data subject rights, and processing agreements.
Sources: CSA STAR program and Cloud Controls Matrix documentation; AICPA SSAE No. 18 attestation standards. Answer written and maintained by the AuditNex research team; last reviewed July 26, 2026. AuditNex is a marketplace — accredited firms price and scope engagements independently.