Accessibility Viewer

The Accessibility Viewer (aViewer) is an inspection tool for Windows that displays the accessibility API information (MSAA, IAccessible2, UI Automation, ARIA, HTML DOM) exposed by web browsers to the operating system, and thus to any assistive technology (AT) such as screenreaders.


The Accessibility Viewer (aViewer) is developed by Jun and Steve Faulkner (The Paciello Group, Europe), with support from Hans Hillen, Gez Lemon (The Paciello Group, Europe), and Google.

Support and development

For questions concerning the Accessibility Viewer (aViewer), or to report bugs, suggest improvements, contribute to the code, see the Accessibility Viewer (aViewer) repository on GitHub. Alternatively, you can email us at

Licensed under the Apache License, Version 2.0 (the “License”). Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.