Simply put it, Fotomato (pronounced as photo-may-toe) is an image viewer. More precisely, Fotomato lets you view multiple images side by side horizontally or vertically. If you have two pictures to compare, just drag and drop each of them onto an empty slot. Now, you can let Fotomato display images as they are. Or choose Resizing Images under Image, and Fotomato will automatically resize your images.
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Fotomato is a product of MacHouse.