AR.js is an open-source library that empowers accessible and efficient Web AR development across nearly any device. We use AR.js to build lightweight, marker-based AR for retail, events, and interactive marketing campaigns. Its broad browser compatibility ensures maximum reach for Web AR development projects, even on entry-level smartphones. AR.js supports image tracking, location-based AR, and smooth performance in mobile web environments. By choosing AR.js for Web AR development, we deliver highly accessible AR activations, perfect for print media campaigns or QR code-triggered experiences.