Accessibility Scanner vs Alfa
Accessibility Scanner
support.google.comAlfa
github.comSide by side
| Figure | Accessibility Scanner | Alfa |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| Android | Yes | — |
| API | — | Yes |
| Self-hosted | — | Yes |
| Plans published | 1 | 1 |
| Spec score · Accessibility Testing Software | 7.5 (#128) | 9.0 (#8) |
| Automated scans | Yes | Yes |
| Free plan | Yes | Yes |
| Headquarters | Mountain View, California, United States | Copenhagen, Denmark |
| Maker | Google Play identifies Google LLC as the developer and lists its address as 1600 Amphitheatre Pkwy, Mountain View, CA 94043, United States. | The repository identifies Siteimprove A/S as the copyright holder, and Siteimprove says it was founded in Denmark in 2003. |
| Purpose | Scans an app’s user interface and recommends common accessibility improvements. | Alfa is an open, standards-based accessibility conformance testing engine for websites built with HTML, CSS, and JavaScript. |
| Remediation guidance | Yes | Yes |
| Results | Displays scan findings on screenshots and lets users review results by screen or category and share them. | Alfa produces audit results in the Evaluation and Report Language (EARL) Schema encoded as JSON-LD. |
Plans
In their own words
Accessibility Scanner
Accessibility Scanner has no write-up on Specifiction yet; its figures are above.
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.