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Sized to your sponge, not a category

A caddy is a small object with an exacting job: hold a few wet things, in a wet place, without sliding or dripping onto the counter. It hooks over your rim rather than sitting inside the basin, so the fit that matters is the rim's shape, not the basin's.

Why a bought caddy rocks

Its footprint was drawn for an average rim, and yours isn't average. Set it down and it bridges two high points with a gap under the third, so it tips whenever you lean on it.

Why it holds water

The drainage gaps went where the mold was convenient, which is rarely where your drain is. Water finds the low corner, sits there, and the sponge above it never dries.

Why the sponge never fits

It fits the sponge it was designed around. That sponge is not the one you buy, and the well is either loose enough to let it slump or tight enough to make it a two-handed job.

How it holds on and drains

  • Rim hook

    A flange drops inside the bowl and catches the rim, so the piece registers on the same spot every time you set it down instead of sliding across the counter.

  • Spill tongue

    A short lip reaches back over the rim and ends at a sharp edge, so water lets go there and drops back into the bowl instead of running under the piece and onto the counter.

  • Sponge and brush space

    Sized to what you actually own, with open gaps underneath so things drain instead of sitting in a puddle.

  • Whatever else

    Steel wool, the drain cover, a ring dish, a scraper. You place them, and the layout arranges the rest around what you pin.

Caddy questions

Will it slide around?
It hooks over the rim, so it registers on the bowl's edge every time you set it down rather than sliding across the counter. The deck follows the shape of your rim, not a generic radius.
What if I change sponges?
Compartments are sized with a little tolerance. A different brand of the same sort of sponge will fit.
Can I leave things out?
You choose what goes in it. Leave out anything you don't want a place for.
Does my phone need LiDAR?
Yes, for scanning. Without it you can still design against a standard bowl shape, but not one measured from your own sink.

Related

Other shapes of the same problem.