A checklist tells you what to do. An audit tells you what's actually wrong and why. Those are different exercises, and confusing them is one of the main reasons SaaS teams spend three months 'fixing SEO' with no measurable result.
The distinction matters because SaaS sites have specific structural patterns that create specific failure modes. A B2B SaaS product with a freemium tier, a help center, a changelog, a developer API doc section, and a marketing blog is juggling four or five distinct content architectures at once — each with its own indexation logic, keyword intent, and link behavior. A generic technical checklist treats all of that the same way.
A diagnostic audit asks: which layer is the actual constraint? If Google can't crawl your pricing page because it's behind a JavaScript wall, publishing more comparison content won't move rankings. If you have 40 blog posts targeting the same problem-aware keyword from slightly different angles, the issue is cannibalization — not domain authority.
The framework below works through five layers in a deliberate sequence. Each layer either confirms the constraint or clears the way to look deeper. You don't need to find problems in every layer — most SaaS sites have one or two primary failure points. The goal is to identify them precisely so your remediation is targeted, not exploratory.
Who this is for: SaaS marketing leaders, growth PMs, and in-house SEO practitioners who want to diagnose their own organic performance before — or in parallel with — working with an external team. It's also useful as a framework for evaluating an agency's audit methodology during a vendor selection process.