There's a WebAIM official one called Wave! It's also available on Firefox, so that's what I use. Axe by Deque even features a mobile app for testing! An extension to check contrast (I use Kontrast) and one to adjust for color blindness is also important. Lighthouse Audits are also really useful, but as I'm sure you already know, there's a good amount of accessibility audit tests that need to be done manually. Thanks for the write up on Continuum!
Thanks for sharing additional tools Charlie - I'll have to check those out! Color contrast is so important and often overlooked - thanks for shedding light on that topic as well.
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