Benchmarking accessibility improvements against past audits starts with a structured comparison of issue counts, severity distributions, and WCAG conformance status across audit cycles. Without a baseline from a previous audit, there is no way to measure progress. With one, every subsequent evaluation becomes a measurable checkpoint.
The core idea is simple: your most recent audit report is a snapshot. Your previous audit report is another snapshot. Comparing them tells you whether your digital asset is moving toward WCAG 2.1 AA or WCAG 2.2 AA conformance, or drifting away from it.
| Benchmarking Factor | What It Tells You |
|---|---|
| Total Issue Count | Whether the overall volume of accessibility issues is increasing or decreasing between audits |
| Severity Distribution | Whether critical and high-severity issues are being addressed or persisting |
| WCAG Criteria Coverage | Which specific success criteria have moved from nonconformance to conformance |
| New vs. Recurring Issues | Whether your team is introducing new issues during development while fixing old ones |
| Conformance Percentage | The ratio of conformant criteria to total applicable criteria across evaluations |
Why Past Audit Data Is the Only Honest Baseline
Automated scans produce numbers, but those numbers are incomplete. Scans only flag approximately 25% of issues. That means scan data alone cannot serve as a meaningful benchmark for WCAG conformance progress.
A (manual) accessibility audit, on the other hand, evaluates every applicable success criterion against real content. When you compare two complete audit reports side by side, you get an accurate picture of where things improved and where they did not.
This is why organizations that invest in periodic audits have a significant advantage. Each audit report becomes a data point. Over time, those data points form a trend line that leadership and project teams can act on.
What Metrics Should You Track Between Audits?
Not all metrics carry equal weight. A drop in total issue count is encouraging, but if high-severity issues remain unchanged, the improvement is cosmetic. Here are the metrics worth tracking:
Total issue count: The most basic measure. Compare the number of unique issues identified in the current audit against the previous one.
Issues by severity: Break the comparison into severity tiers. Critical and high-severity issues affect the most users. A reduction in those tiers matters more than eliminating a dozen low-severity items.
WCAG criteria status: Map each success criterion to a status: conformant, partially conformant, or nonconformant. Track how many criteria shifted from nonconformant to conformant since the last evaluation.
New issues introduced: Remediation sometimes fixes one issue while development introduces another. Count how many issues in the current report are new, meaning they did not appear in the prior audit.
Remediation completion rate: Of the issues identified in the previous audit, what percentage were fully resolved before the next evaluation? This tells you whether your remediation process is keeping pace.
How to Structure a Side-by-Side Comparison
Start with both audit reports open. Create a comparison document or spreadsheet with columns for the WCAG criterion, the status in the previous audit, the status in the current audit, and any notes on what changed.
Group the criteria by WCAG principle: Perceivable, Operable, Understandable, and Conformance. This grouping reveals whether improvements are concentrated in one area or spread across the standard.
| WCAG Criterion | Previous Audit Status | Current Audit Status | Change |
|---|---|---|---|
| 1.1.1 Non-text Content | Nonconformant | Conformant | Resolved |
| 1.4.3 Contrast (Minimum) | Nonconformant | Nonconformant | Persistent |
| 2.4.4 Link Purpose | Nonconformant | Conformant | Resolved |
| 4.1.2 Name, Role, Value | Conformant | Nonconformant | Regression |
This kind of table immediately surfaces three categories: resolved issues, persistent issues, and regressions. Each category demands a different response from your team.
Using Accessibility Tracker Platform for Benchmarking
The Accessibility Tracker Platform was built to centralize audit data so that comparisons across evaluation cycles happen inside a single interface. When audit reports are uploaded to the platform, issue data is organized by WCAG criterion, severity, and project.
Instead of manually creating comparison spreadsheets, the platform maps current issues against previously tracked ones. Teams can see at a glance which issues were resolved, which remain open, and which appeared for the first time in a new audit cycle.
AI-generated progress reports within the platform provide a narrative summary of how a project has moved since the last audit. This is especially useful when reporting to decision-makers who need a clear picture without reading through raw audit data.
For organizations managing multiple digital assets, the platform aggregates benchmarking data across projects. That portfolio view shows which properties are improving fastest and which need more attention.
How Often Should You Benchmark?
Benchmarking frequency depends on how actively your team is remediating. If remediation is ongoing and your development team ships updates regularly, evaluating every 6 to 12 months gives you meaningful data to compare.
If remediation happens in a concentrated sprint, a follow-up evaluation shortly after the sprint confirms whether fixes hold up. That follow-up becomes your new benchmark for future comparisons.
Organizations pursuing ADA compliance or preparing for the European Accessibility Act (EAA) often benchmark quarterly during active remediation phases, then shift to annual evaluations once conformance stabilizes.
Common Patterns When Comparing Audits
A few patterns appear frequently when organizations compare audit reports over time.
The first is the "fix and regress" cycle. Issues from the previous audit get resolved, but new development introduces fresh accessibility issues. The total count stays flat or even rises. This pattern signals that the development team needs accessibility training, not more remediation hours.
The second is severity inversion. The total number of issues drops, but the remaining issues are disproportionately high severity. This happens when teams prioritize easier fixes and defer complex ones. Severity-based prioritization formulas can correct this by directing attention to the issues that affect the most users first.
The third is conformance plateau. Progress stalls at a certain percentage of WCAG criteria conformance. Typically this occurs when remaining issues require deeper technical work, such as custom component refactoring or third-party integration changes.
Can scan results be used to benchmark between audits?
Scan data can supplement your benchmarking, but it cannot replace audit data. Scans only flag approximately 25% of issues, so comparing scan results between audit cycles gives you an incomplete view. Use scans for monitoring between audits, not as the benchmark itself. The benchmark is always the full audit report.
What if our first audit did not follow WCAG 2.2 AA but we want to benchmark against it now?
You can still compare overlapping criteria. WCAG 2.2 AA builds on WCAG 2.1 AA, so most success criteria are shared. Compare those shared criteria directly. For the criteria unique to 2.2, your current audit establishes the first baseline. Future evaluations will benchmark against it.
How do you measure whether accessibility remediation is cost-effective?
Compare the cost of each remediation cycle against the number and severity of issues resolved. If the cost per resolved critical issue is decreasing over time, your process is becoming more efficient. Tracking this metric alongside conformance percentage gives you both a quality and a cost perspective.
Benchmarking accessibility progress is not a one-time exercise. It is an ongoing practice that turns audit data into a measurable record of improvement. When each audit report connects to the one before it, your organization has a clear, defensible story of progress toward WCAG conformance.
Contact Accessibility Tracker to centralize your audit data and benchmark improvements across every evaluation cycle.