Vesper, a plug and play Ruby web framework (Sinatra + Rack + Plugins)
Vesper is a suite of web accessibility tools - color contrast checker, WCAG site auditor, element inspector, and free accessibility guides. Free to start.
Vesper, a plug and play Ruby web framework (Sinatra + Rack + Plugins) launched on January 16, 2012 with 40 votes, #36 of 306 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 14 years on.
In plain words
Vesper is a web accessibility auditing suite that helps developers and agencies find and fix accessibility issues. It includes a WCAG site auditor, color contrast checker, browser inspector, responsive viewer, media crawler, and accessibility guides. All six tools are free to use, with an optional $99/year Supporter tier that unlocks full site crawls and report exports in multiple formats. The tool runs automated checks against WCAG 2.2 Level A and AA standards and requires macOS and Google Chrome.
written from the facts on this page · September 2026
From the sources
Six tools for auditing, understanding, and fixing web accessibility: a WCAG site auditor, a contrast checker, a browser inspector, a responsive viewer, a media crawler and a growing library of plain-language guides.
Does a similar job
all alternatives →
LambdaTest Accessibility Testing Suite2025 · testmuai.com · ▲354Ensure web inclusivity & compliance with just a few clicks.
Venngage's Accessible Color Palette2022 · venngage.com · ▲126Create color combinations that follow WCAG with ease
Accessibility Checker by WebYes23d ago · chromewebstore.google.com · ▲54Check any webpage for Accessibility issues, right in Chrome
Accessibility Cloud2023 · accessibilitycloud.com · ▲73Web and document accessibility test and monitoring platform
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Source: Show HN post ↗
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