Most of our sponge holders use suction cups to stay up, but some worked better than others. As we learned, both the size of the suction cups and the distance between them make a big difference in how well they stay up. Larger cups are simply stronger. Mechanically, the distance between the cups acts as a horizontal lever, making the cups’ position more stable and less likely to scoot around.

The suction cups on our winner by SunnyPoint were among the largest suction cups in the lineup and were also the widest set. At 2½ inches in diameter and 5 inches apart, they never shifted or lost grip. A similar-looking holder by iDesign did move when struck. Its suction cups are much smaller, at 1⅞ inches across, and set just 2¾ inch apart, which made this model much more likely to slide and even detach.
The Simplehuman model uses four small suction cups measuring 1¾ inches across plus a metal bar that bends over the top of the sink rim to lend support. It stayed in place. The distance between the cups horizontally was just 3¾ inches, but the furthest suction cups (diagonally) were 4½ inches away from each other, which helped stabilize this holder.
The OXO model has just one 2½-inch suction cup. As air and water gradually work their way under to loosen the cup’s grip, this model has no backup or other form of support. As a result, we found it lying at the bottom of the sink twice.

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Sponge Holders