Accessibility Checker vs Alfa
Accessibility Checker
accessibleresources.comAlfa
github.comSide by side
| Figure | Accessibility Checker | Alfa |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | — | Yes |
| Windows | — | Yes |
| macOS | Yes | Yes |
| Linux | — | Yes |
| iOS | Yes | — |
| API | — | Yes |
| Self-hosted | — | Yes |
| Plans published | 5 | 1 |
| Spec score · Accessibility Testing Software | 8.1 (#70) | 9.0 (#8) |
| Automated scans | Yes | Yes |
| Free plan | Yes | Yes |
| Headquarters | United Kingdom | Copenhagen, Denmark |
| Integrations | On iPhone and iPad, users can load pages or images from Safari and Photos through the share sheet; Mac offers a Safari extension for audits and reports. | The integrations repository lists packages for Angular, Chai, Cheerio, Cypress, Jasmine, Jest, jQuery, Playwright, Puppeteer, React, Selenium, Unexpected, Vitest, Vue, and WebdriverIO. |
| Maker | The maker says it builds accessibility tools for developers, product designers, and researchers, with a team experienced at Google, Apple, and Spotify. | The repository identifies Siteimprove A/S as the copyright holder, and Siteimprove says it was founded in Denmark in 2003. |
| Purpose | Accessibility Checker audits websites for accessibility using axe-core WCAG scans, keyboard focus order mapping, and color contrast checks. | Alfa is an open, standards-based accessibility conformance testing engine for websites built with HTML, CSS, and JavaScript. |
| Remediation guidance | Yes | Yes |
Plans
Accessibility Checker
- MonthlyPrice not published
- Yearly accessPrice not published
- Pro (Yearly)Price not published
- Monthly premium subscriptionPrice not published
- Checker Pro LifetimePrice not published
In their own words
Accessibility Checker
Accessibility Checker 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.