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For better WCAG coverage, combine automated checks with manual evaluation, assistive-technology testing, and—where practical—feedback from people with disabilities. Start by defining the product, WCAG target, and supported environment; explore key views and complete workflows; then test a documented sample and report what you did and did not evaluate. A scan or sampled review is useful evidence, but it cannot prove that an entire product is free of accessibility barriers.
Set the evaluation target and boundaries
Before choosing tools or tests, write down what is being evaluated and why. Set boundaries that another evaluator could understand and reproduce.
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- Product: Identify the website, app, or other digital product, and specify the parts included or excluded.
- Purpose: State whether the evaluation is for internal improvement, a release check, or a public conformance statement.
- Standard and target: Name the WCAG version and conformance level you are evaluating against. WCAG-EM 2.0 says Level AA is generally accepted and recommended, but the evaluator should select and state the target for the particular evaluation.
- Accessibility-support baseline: List the browsers, assistive technologies, and other user agents against which the product will be checked. Results are meaningful only in relation to a declared support baseline.
W3C’s WCAG-EM 2.0, published 23 July 2026, provides a methodology for evaluating websites, apps, and other digital products. It supports WCAG; it does not add requirements to the standard.
Explore the product and choose a useful sample
Inventory the product before testing. Note distinct page or screen types, content, technologies, and functionality. Include end-to-end processes that matter to users—such as signing in, submitting a form, or completing a purchase—not just isolated landing pages.
When evaluating every view is practical, do so. When it is not, select a structured sample that covers important or distinct views and functionality; add random sampling where it helps. Record how each sample is reached, including relevant settings, inputs, and actions. A sample makes an evaluation manageable, but it leaves unexamined areas unverified. Do not describe a sampled review as proof that every view conforms.
Combine methods according to what each can establish
Different methods answer different questions. Use them together against the same target and sample rather than treating one method as a substitute for the others.
Rank #2
| Method | Useful for | What it cannot establish by itself |
|---|---|---|
| Automated or semi-automated checks | Efficiently flagging issues that can be checked mechanically and supporting repeatable checks across a sample. | Whether every finding is a real problem, whether content and interaction work for users, or whether the product conforms overall. |
| Manual inspection | Evaluating questions that require human judgment, including content, context, and behavior. | Consistent coverage unless the evaluator follows a defined scope, criteria, and procedure. |
| Assistive-technology checks | Checking sampled content and workflows with the assistive technologies in the declared support baseline. | Compatibility with assistive technologies or environments that were not tested. |
| Participation by people with disabilities | Revealing real-life experience and barriers that a checklist may not convey. | A systematic WCAG evaluation across the full scope; user input complements, rather than replaces, that evaluation. |
Use automation for efficiency, then investigate its output manually. The W3C describes evaluation tools as a way to improve efficiency, not as a complete evaluation. Section508.gov also discusses automated, manual, and hybrid testing approaches and advises checking tool rule methods and accuracy against expectations. Neither these sources nor the cited methodology establishes a universal percentage of WCAG criteria that automation can cover, so avoid presenting such a percentage as a general fact.
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- Record scope and target. Document the product boundaries, purpose, WCAG version and level, and accessibility-support baseline.
- Explore key views and workflows. Inventory content types, technologies, and important interactions; identify complete processes that should be tested.
- Choose and record the sample. Cover distinct and important views and functionality. If the sample is not exhaustive, document the selection method and how each item is reached.
- Run automated checks. Record tool names, versions, settings, and methods. Keep the outputs as findings to investigate, not as a pass/fail verdict for the product.
- Inspect findings and evaluate manually. Check whether flagged issues occur in context, and examine WCAG questions that require human judgment.
- Test real interaction. Exercise the sample against the selected requirements and support baseline, including assistive-technology use where applicable. Involve people with disabilities when practical, and record their role and the conditions of participation.
- Report results and limits. State the scope, target, sample, test environment, tools, assistive technologies, procedures, findings, and areas not evaluated.
Report findings without overstating coverage
A useful report lets another person understand what was checked, what was found, and how much of the product the findings represent. Identify the evaluated product and target, describe the sample and test conditions, and distinguish confirmed issues from tool flags that need more investigation.
Rank #3
WCAG-EM alone usually does not produce a whole-product conformance claim. Any public evaluation statement has conditions and should identify the evaluated product and target. Explain exclusions and sampling limits plainly; do not imply that untested screens or workflows passed.
Use scores cautiously
A single aggregate score can hide which barriers matter, where they occur, and what remains untested. W3C’s WCAG-EM 2.0 methodology states that “there is currently no single metric that is known to address the required reliability, accuracy, and practicality.” If you publish a score, explain its calculation and scope so readers can interpret and reproduce it; do not let it replace issue-level findings.
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ScreenshotNeo is a website screenshot API and MCP server, not a WCAG evaluator. It can help capture rendered pages for review or documentation, but a screenshot does not establish keyboard, screen-reader, or broader conformance behavior. The API accepts one GET request for a URL and returns an image or PDF.
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For example, this cURL request saves a WebP screenshot of the target page; replace the example URL and use your API key. See the ScreenshotNeo API documentation for request options.
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- Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed. Responses indicate the page verdict and billing status in headers.
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Sources
- W3C WAI, WCAG-EM Overview: WCAG Evaluation Methodology (overview updated 12 August 2026).
- W3C, WCAG Evaluation Methodology (WCAG-EM) 2.0 (published 23 July 2026).
- U.S. General Services Administration, Overview of Testing Methods for 508 Conformance.
Frequently Asked Questions
Does WCAG-EM 2.0 apply only to websites?
No. The W3C says WCAG-EM 2.0 extends the earlier website-focused methodology to apps and other digital products.
Should accessibility testing use a fixed automation-to-manual ratio?
The cited W3C and Section508.gov guidance does not establish a universal ratio. Choose methods based on the product, target, support baseline, and evaluation purpose.
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