To make it as easy as possible for you to incorporate accessibility-checking into your current workflow, we have selected a number of testing tools that will work with different browsers. So take a look around at the options, and choose what will work best for you. Before you make your choice(s), it's important to read enough about each tool to understand what it will and will not be able to do for you.
There are a growing number of tools that have APIs so that you can incorporate them into testing and development environments with which you are already familiar. At this time, the WAVE API and Tenon are two of the most active, but the accessibility-testing tools landscape is rapidly evolving, so you may wish to explore further.
One of the best places to conduct research on available tools is the database maintained by the Web Accessibility Initiative (part of the World Wide Web Consortium). Take a look at the Web Accessibility Evaluation Tools List.
No web accessibility-checking tool can do everything; human intervention and decision-making are always required. But use tools for what they can do best for you -- find low-hanging fruit, including potential errors based on readily identifiable patterns.
If you want to get an idea of what automated testing can flag, try WebAIM's WAVE service. Just go to the site, paste the url of a publicly-facing page into the edit box, and see what the results are. If you find a number of errors, don't panic. Addressing web accessibility issues is a process, and we're here to help you.
Accessibility 102: The WAVE Accessibility Tool (WAVE tutorial)
A number of developer extensions and tools are available for Google's Chrome browser which can help you with testing and improving the accessibility of your websites. Read more about Chrome Extensions
Here's one to note: WAVE Chrome Extension
Given the relative ease of writing Firefox extensions, it's not surprising that many have emerged for developers to use while creating web content. These extensions may be useful during the development or repair phase of content creation. This list is not comprehensive; rather, it has been compiled to give you a sense of the range of options available. Read more about Firefox Extensions