There are hundreds of accessibility tools available on the web. They can help with checks for:
- Required reading age for a piece of text (and suggestions for sentences to revise).
- How your site looks to users with color-blindness.
- Areas where contrast is too low for good readability.
- Indicating areas of the site that need manually checking for issues - such as only conveying information in pictoral form.
Here's a link to whet your appetite: 8 Tools to Analyze Your Website’s Level of Accessibility