Image Compare is a free iPhone app developed by Reiji Kobayashi, designed for multimedia purposes. This tool offers four comparison modes: Concurrent, Slide, Opacity, and Difference. In Concurrent mode, images are compared side by side, while Slide mode uses a slider for comparison. Opacity mode allows for comparison by adjusting transparency, and Difference mode compares images by subtraction. Within the Difference mode, users can choose between Express, which resizes images to screen width for faster processing, or Original, which processes images at their original scale, taking more time.

The app includes features such as zoom functionality for detailed inspection in Slide, Opacity, and Difference views. Additionally, users can export the compared images in the Difference view for further use.