How often should you run accessibility scans? Compliance scan frequency depends on site changes, traffic, and risk profile. Here is the practical answer.
Accessibility scans should run at least monthly for most websites, weekly for sites with frequent content updates, and after any meaningful code release. Compliance scan frequency is set by how often a site changes, not by a fixed calendar. Scans flag approximately 25% of accessibility issues, so the cadence matters most as part of an ongoing monitoring program paired with periodic (manual) audits.
| Site Profile | Recommended Cadence |
|---|---|
| Static marketing site | Monthly scans, plus a scan after any redesign or template change. |
| Content-heavy site | Weekly scans across templates and high-traffic pages. |
| E-commerce or SaaS | Daily or weekly scans, with scans tied to release cycles. |
| Government or regulated | Weekly scans paired with annual (manual) audits and ACR updates. |
What Compliance Scan Frequency Actually Means
Compliance scan frequency refers to how often automated checks run against a site to evaluate HTML, CSS, and ARIA attributes for known accessibility issues. A scan is not an audit. It is a programmatic review that identifies a portion of WCAG-related issues, roughly 25%, with the remaining 75% requiring human evaluation.
Frequency is the rhythm of those scans over time. A one-time scan offers a snapshot. Recurring scans turn that snapshot into a monitoring program that catches regressions as content and code change.
Factors That Set the Right Cadence
Several variables shape how often scans should run. Site change velocity is the largest factor. A site that ships new pages or features weekly needs more frequent scanning than one that updates quarterly. Traffic volume matters because high-traffic pages carry more user impact when issues appear.
Risk profile also plays a role. Organizations subject to ADA Title II obligations, which reference WCAG 2.1 AA, often run scans more frequently to stay aligned with documented conformance. Sectors with heightened legal exposure tend to scan weekly at minimum.
Typical Cadences by Site Type
For a small business website with infrequent updates, monthly scans across all key templates work well. Add an out-of-cycle scan after any design refresh, plugin update, or template change.
For content-heavy sites such as news, education, or large blogs, weekly scans across page templates and a sample of recent articles give a useful signal without producing noise. For e-commerce and SaaS, scans should be tied to deployment cycles. If code ships daily, scans should run daily on staging and production.
How Scans Fit With (Manual) Evaluation
Scan frequency only addresses part of the picture. Because automated checks identify around 25% of issues, the remaining work falls to (manual) evaluation by accessibility professionals using screen reader testing, keyboard testing, and code inspection. Most organizations pair recurring scans with an annual or semi-annual audit.
This pairing is the core of a monitoring program. Scans catch regressions between audits. Audits identify issues scans cannot see, such as misused ARIA, missing form instructions, or content that is technically present but not usable.
Events That Warrant an Out-of-Cycle Scan
Beyond the regular schedule, certain events call for an immediate scan:
- Template or theme changes that affect headers, footers, navigation, or page layouts.
- New page types introduced through CMS updates or campaigns.
- Third-party integrations added to checkout, forms, or media players.
- Major content migrations from one platform to another.
- Post-remediation verification after a development team completes fixes from an audit report.
Documenting Scan Results Over Time
Frequency is only useful if results are tracked. Recurring scans should feed into a monitoring record that shows when scans ran, what issues were identified, and how those issues were prioritized and remediated. This record supports both internal accountability and external documentation, including ongoing accessibility monitoring programs that demonstrate continued attention to WCAG conformance.
Without documentation, a high scan cadence produces data nobody uses. With documentation, the same cadence becomes evidence of an active compliance program.
Setting a Cadence You Can Sustain
The right scan frequency is the highest cadence an organization can sustain with proper review and remediation behind it. Daily scans with no one reading the reports add little value. Monthly scans with assigned ownership and timely fixes do far more for risk reduction than any frequency without follow-through.