Free Testing Tools
While automated testing has its limits and catches only 15–30% of all accessibility errors, it can be free and easy to do. Note that different tests may show different issues.
Developers will use some of the same tests because they are interested in the code behind your pages. You will want to concentrate on the organization of your page, spelling, and readability.
Here are some tools you can use to run quick tests on content:
Web Page Accessibility