Debug tools
While no automation test will ever 100% cover all scenarios and capture all a11y issues, this is still a good place to start.
Browser Extensions
There are several nice tools you can add to your browser to help with accessibility testing.
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AxeDevTools
Made by Deque, this is one of the top browser extensions for accessibility. It is free and offers a paid tier (Pro) that allows for more control, reporting, and some cool automated tests. This will cover full page.
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ARC Toolkit
Created by TPGi, this will covers accessibility and checking sematic html is a click away, currently only available in Chrome. This will cover full page.
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WCAG Color contrast checker
Available for Chrome And Edge to specifically check color contrast ratios. This is baked into firefox (dev tools, Accessibility tab, check for issues - contrast). You can read more about color contrast here.