Side by side

Clym Accessibility Scanner vs HTML_CodeSniffer

Both stand on accessibility testing software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

Clym Accessibility Scanner

Free plan Web

Clym Accessibility Scanner provides free automated checks and report tools for website accessibility work. Use its findings as a starting point, then review areas the automated scan cannot judge.

Visit Clym Accessibility Scanner

HTML_CodeSniffer provides several ways to inspect HTML against accessibility and coding rules, including custom standards. Its client-side design and documented Node.js routes make it adaptable for page or fragment checks.

Visit HTML_CodeSniffer

The facts

	Clym Accessibility Scanner	HTML_CodeSniffer
Free plan	Yes	Yes
Open source	Not published	Not published
Runs on	Web	API, Extension, Linux, Mac, Self-hosted, Web, Windows
Lowest paid plan	Free or on request	Not published
Plans published	2	None
Maker	Clym Accessibility Scanner	Not published
Website	clym.io	squizlabs.github.io
On accessibility testing software	#81 of 169	#85 of 169

Clym Accessibility Scanner: what it does well

Checks WCAG 2.2, Section 508 and EN 301 549
Severity groups findings by critical, major and minor
Code references and remediation guidance included
Scans multiple URLs or entire domains
Free PDF downloads and online report sharing

What to know first

Automated checks do not replace human assessment
Visual readability requires additional review
Logical flow requires additional review

HTML_CodeSniffer: what it does well

Free and open source
WCAG 2.1 and Section 508 checks
Custom sniffs and standards
JavaScript and command-line use
Bookmarklet supports four browsers

What to know first

Browser extension is not available
Auditor translations are basic
Requires setup for self-hosting

Alternatives to Clym Accessibility Scanner Alternatives to HTML_CodeSniffer The whole list