axe: the Accessibility Engine

Axe is an open source rules library for accessibility testing. It was developed to empower developers to take automated accessibility testing into their own hands and to avoid common pitfalls of other automated accessibility tools.

What sets axe apart?


Lightweight, flexible, and secure. Axe-core is a self-contained open source library and testing engine. It doesn’t require any outside server calls, and it can be customized to include custom rules and to integrate with all modern browsers and testing frameworks.

Getting Started with an axe Browser Extension

  1. Download the axe extension for Chrome or the axe extension for Firefox.
  2. Go to the page you want to test.
  3. Open up your browser’s developer tools menu. You can accomplish this by right-clicking on the page and selecting “Inspect” or “Inspect Element.”
  4. Select the axe tab in the developer tools menu. In Firefox the tab is named “Accessibility” or “axe Accessibility Audit.”
  5. Hit the big “Analyze” button.On the left-hand side of the axe dashboard, you’ve got a handy list of accessibility issues and how many times the issue occurs on the page. When you click on an issue, a detailed explanation is provided to the right of the list and includes:
    • A description of the issue with a link to additional info available for free on Deque University
    • A snippet of the code that has caused the issue
    • Guidelines for fixing the issue
    • Information about the severity of the issue and which accessibility guidelines are being violated (e.g. WCAG 2.0, Section 508, etc.)
    • And the “Inspect” button which will bring you to the problem-code in your browser’s page inspector

Here’s a Video Guide for You Multi-Sensory Learners

Explore axe


Learn More about axe Integrations

axe Playground

Learn More with the axe Playground

axe Early Release Tools

Learn More about axe future tools


Learn More with the axe documentation

Join the axe Community

screenshot of a chat window for the axe community

The axe team maintains active channels on Gitter and the A11y workspace on Slack.

axe Webinars

Creating Accessible Web Applications with axe

axe Live Tutorial

axe Updates and Coconut

Multiple screenshots of WorldSpace tools, including mobile, CLI and the extension.

Are you ready for enterprise-level accessibility testing?

WorldSpace Attest - Accessibility testing for development teams