Able

The Able plugin allows you to check the color contrast ratio. It can analyze the color contrast between any two colors you select, give you a preview of how they would look with different contrast, and simulate what those colors will look like to people with color vision deficiencies.

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WAVE is a popular website accessibility checker that you can use by entering the URL on their website or downloading a Firefox or Microsoft Edge extension. It adds a visual overlay of error icons with detailed information and recommendations about the accessibility issues detected.

axe DevTools

Just as an axe is lightweight and fast-swinging, helping to split, and pierce, so is the axe Devtools Chrome extension that lets you cut out your accessibility defects accurately and effectively.

Vision - Apple

Like other screen readers, VoiceOver describes everything happening on your device's screen by speaking the text from documents and windows. You can easily navigate it through a touchscreen, trackpad, or keyboard.