A11y Tester is an iOS application designed to help users evaluate mobile web pages for accessibility and compliance with the Web Content Accessibility Guidelines (WCAG). The app allows users to enter or load web pages and automatically scans them for common accessibility issues. A11y Tester highlights potential barriers, provides guidance on WCAG criteria, and helps users improve the accessibility of their mobile web content. The service is intended for developers, designers, and anyone seeking to test and enhance the accessibility of web pages on mobile devices.