AccessLint vs Alfa

AccessLint checks accessibility during development, on pull requests, and on live sites. Its WCAG 2.2 engine has 95 rules and a stated 53ms median audit across 5,000 real-world sites. Pull-request reviews inspect changed files and leave inline comments with the relevant rule and a suggested correction, but do not fail builds or block merges. Deploy-triggered scans require Starter or Pro, run asynchronously, and also do not synchronously fail builds. Saved user journeys can run daily, with email alerts for new violations or changes against a baseline. The toolkit provides checks for Playwright, Vitest, and Storybook, while pull-request reviews use a GitHub App. Starter and Pro include shareable read-only evidence reports with before-and-after screenshots of affected elements. Free covers public-repository pull-request reviews, one daily monitored flow, and violation trends. Starter costs $19 a month or $190 a year; Pro costs $349 a month or $3,490 a year. AccessLint says automated checks alone cannot make a site compliant.

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.