Ad Corrector is a free online tool designed to help advertisers, designers, agencies, and marketers evaluate outdoor (OOH) and billboard ad designs before they go live. Outdoor advertising has only a few seconds to make an impression, and even well-designed ads can fail if key messages are unclear, difficult to read, or visually overwhelming at real-world viewing speeds.
The tool reviews essential visual and messaging factors that influence whether an ad is noticed and understood quickly, such as readability, contrast, visual structure, and message hierarchy. These elements are evaluated in the context of how people actually encounter outdoor ads while driving or passing by, not how they appear on a desktop screen.
Users upload their billboard or OOH creative and confirm basic viewing conditions, such as format and speed. Ad Corrector then provides clear, objective feedback that highlights potential problem areas and explains what is working well. The goal is not to redesign creative, but to help users identify issues early and make informed improvements before production or launch.
