In Photoshop, guides added by GuideGuide snap to the nearest pixels. This ensures your grids are always pixel-precise.
Because pixel snapping does not allow fractions of pixels, when GuideGuide divides the space evenly between the columns/rows there may be extra pixels left over. GuideGuide evenly distributes these pixels across the right and bottom columns. For example, a grid that has 3 columns and is 10 pixels wide will have columns that are
4px wide, from left to right. In most grids, the leftover pixels are not visually noticeable.
In Illustrator, GuideGuide will only snap to pixels if you use pixel measurements.
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