A UX audit or usability audit is a professional and in-depth evaluation of your website’s, web application’s, or mobile app’s user interface — which takes between two to four weeks. — A user experience audit or usability audit is a professional and in-depth evaluation of your website’s, web application’s, or mobile app’s user interface — which takes between two to four weeks. This helps you to identify potential usability problems through interviews and testing with your target audience.