Alfa vs WCAG-EM Report Tool
Alfa
github.comWCAG-EM Report Tool
w3.orgSide by side
| Figure | Alfa | WCAG-EM Report Tool |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | — |
| Self-hosted | Yes | — |
| Plans published | 1 | 1 |
| Spec score · Accessibility Testing Software | 9.0 (#8) | 7.7 (#109) |
| Automated scans | Yes | No |
| CI/CD integration | Yes | No |
| Founded | 2003 | 1994 |
| Free plan | Yes | Yes |
| Integrations | The integrations repository lists packages for Angular, Chai, Cheerio, Cypress, Jasmine, Jest, jQuery, Playwright, Puppeteer, React, Selenium, Unexpected, Vitest, Vue, and WebdriverIO. | The tool page does not state that it integrates with other products. |
| Maker | The repository identifies Siteimprove A/S as the copyright holder, and Siteimprove says it was founded in Denmark in 2003. | The tool is developed by W3C's Web Accessibility Initiative; W3C describes itself as an international public-interest nonprofit founded in 1994. |
| Purpose | Alfa is an open, standards-based accessibility conformance testing engine for websites built with HTML, CSS, and JavaScript. | The tool turns accessibility evaluation findings into a structured report based on WCAG Evaluation Methodology (WCAG-EM). |
Plans
In their own words
Alfa
Alfa is a free, open accessibility testing engine for websites built with HTML, CSS, and JavaScript. It checks pages against accessibility standards such as WCAG, using included rules or pluggable rules in the ACT Rules Format. Developers can add custom rules and filter results by conformance level or WCAG version. Audit output follows the Evaluation and Report Language schema as JSON-LD, and the command-line interface can audit a single page and save results as JSON. Scraper and crawler tools create page representations and discover pages across a site or subdomain. Ready-made integrations cover frameworks and test tools including Angular, React, Vue, Cypress, Jest, Playwright, Puppeteer, Selenium, and WebdriverIO. Alfa is distributed as separate npm packages under the MIT license. It runs in ECMAScript 2022-compatible JavaScript environments, including recent Node.js and browser versions. Building from source requires Node.js 20 or later and Yarn. The project says most integrations are experimental and may change; older environments may be targetable from source but are not explicitly supported.
WCAG-EM Report Tool
WCAG-EM Report Tool has no write-up on Specifiction yet; its figures are above.