ISO/IEC 27001 is the international standard for an information security management system, or ISMS. Certification requires a Stage 1 documentation review and a Stage 2 implementation audit by an accredited certification body, followed by annual surveillance audits and recertification every three years. Implementation services cover gap assessment, ISMS scoping and design, risk assessment and treatment, the Statement of Applicability, control implementation against the 93 Annex A controls in the 2022 revision, internal audit, and audit readiness. TechVendorIndex tracks nine firms spanning accredited certification bodies, cyber-advisory consultancies and compliance-automation platforms. Typical buyers are CISOs and compliance leads pursuing certification to win enterprise or regulated contracts. No firm pays for placement on this directory.
The single most important structural point is independence: an accredited certification body that audits your ISMS cannot also act as the consultant that designs and implements it, because that conflict voids the accreditation. A-LIGN, Schellman, BSI Group and NQA are certification bodies — engage them for the audit, not the build. Advisory consultancies such as Coalfire and Vista InfoSec run the gap-to-certification programme: scoping, risk treatment, policy authorship and pre-audit remediation. Compliance-automation platforms — Vanta, Drata and Secureframe — accelerate evidence collection and give continuous control monitoring, but they do not replace the human work of risk assessment or the accredited audit itself.
The 2022 revision restructured Annex A into 93 controls across four themes — organisational, people, physical and technological — and added controls for threat intelligence, cloud security and secure coding. Any partner should map your existing controls to the 2022 set and produce a defensible Statement of Applicability rather than a generic template. The most common failure mode is treating ISO 27001 as a documentation exercise; auditors increasingly test whether controls operate in practice, so evidence of live operation matters more than polished policies.
For adjacent governance work see IT governance and compliance and cybersecurity services; for cloud extensions see ISO 27017 cloud security. To compare the underlying tooling, see the cybersecurity software category and the independent best cybersecurity for enterprise ranking.
Consultant-led implementation cost scales with organisation size and scope. Small organisations under 50 staff typically spend 15,000 to 50,000 US dollars for first-year certification; mid-sized organisations 50,000 to 150,000; and large enterprises 150,000 to 500,000 or more. Accredited audit fees are separate: combined Stage 1 and Stage 2 audits commonly run 4,500 to 25,000 dollars, with annual surveillance audits of 3,000 to 12,000. Automation platforms are priced as annual subscriptions on top. Pricing verified June 2026. Enterprise pricing requires a quote.
The principal limitation buyers overlook is that automation tooling, while it reduces evidence-gathering effort, cannot perform the risk assessment, scope the ISMS or satisfy the accredited audit — and over-reliance on a tool's default controls produces a generic Statement of Applicability that auditors challenge. A second limitation is timeline: a realistic first certification takes six to twelve months from kick-off, and programmes promising certification in under three months almost always exclude the operating evidence period auditors expect to see.
Tell us what you're evaluating and we'll send a tailored shortlist of vendors that actually fit — no vendor funding, no pay-to-play.
6,000+ vendors · 893 comparisons · 48 country guides · Independent & vendor-neutral