Alfa vs ARIA DevTools
Alfa
github.comARIA DevTools
github.comSide by side
| Figure | Alfa | ARIA DevTools |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | — |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | — |
| Self-hosted | Yes | — |
| Plans published | 1 | 1 |
| Spec score · Accessibility Testing Software | 9.0 (#8) | 7.1 (#158) |
| Availability | Alfa is distributed as separate packages through npm and is released under the MIT license. | The maker says the extension is available for free for Chrome and Firefox. |
| Free plan | Yes | Yes |
| Maker | The repository identifies Siteimprove A/S as the copyright holder, and Siteimprove says it was founded in Denmark in 2003. | The GitHub profile identifies the maker as Mateusz Zieliński and lists Gdańsk as the location. |
| Purpose | Alfa is an open, standards-based accessibility conformance testing engine for websites built with HTML, CSS, and JavaScript. | ARIA DevTools helps spot missing ARIA labels, misused ARIA roles, and incomplete keyboard support in web applications. |
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.
ARIA DevTools
ARIA DevTools has no write-up on Specifiction yet; its figures are above.