The WAVE tool is a free, browser-based tool created by WebAIM to help identify accessibility issues on web pages.
There are two simple ways to use the WAVE tool: WAVE Browser Extension and WAVE Online Tool.
WAVE breaks its report down into several key components: Errors, Alerts, Features, Structural Elements, and ARIA.
WAVE is excellent at pointing out problems, but it's up to you to fix them by addressing common issues like missing alt text and insufficient color contrast.