Compare the options
| Product | Who it suits | Trade-off |
|---|---|---|
 Tidy Cats Free & Clean Unscented | Editorial pick for clumping clay with charcoal in many container sizes. | Charcoal is listed as an ingredient, not a promised result, and the largest formats run to 40 lb. |
 Fresh Step Simply Unscented | Editorial pick if you want a named odor feature on a clumping clay. | Fresh Step says it is formulated with no added fragrances or dyes, and its FAQ calls the litter fragrance-free. Its odor wording is the maker's own claim. |
 World's Best Cat Litter Multiple Cat Unscented | Editorial pick for plant-based clumping litter made from corn. | 'No artificial perfumes' does not mean no scent, and the added plant material is undisclosed. |
 Fresh Step Crystals | Editorial pick for a clay-free box that needs no clumps. | There are no lumps to lift, so scooping differs from clay. It is separate from Fresh Step's scent crystals additive. |
 Purrify | Editorial pairing for whichever litter you pick. | It is an additive, not a litter, so you still need litter underneath. |
Tidy Cats Free & Clean Unscented
Tidy Cats Free & Clean Unscented is a clumping clay litter with activated charcoal. The maker lists no fragrances and no dyes. It comes in a 14 lb jug, 20 lb jug, 35 lb pail, 40 lb box and a 40 lb bag bundle, so you can pick a size by how you store and carry litter. [1]
Fresh Step Simply Unscented
Clumping clay with enhanced carbon and what the maker calls Ammonia Block Technology. [2]
Fresh Step's directions for Simply Unscented say to fill the box 3 to 4 inches deep and remove solid waste and clumps every day. Put the waste in the trash. Do not flush it. [2]
World's Best Cat Litter Multiple Cat Unscented
World's Best Multiple Cat Unscented is made from whole kernel US grown corn plus a proprietary natural plant material the maker does not fully name, and has no artificial perfumes. Current sizes are 8, 15, 28 and 32 lb. The maker calls it quick clumping and suggests 2 to 3 inches of depth with daily scooping. [3]
Fresh Step Crystals
The maker's FAQ says this full litter is made of silica gel, is not clay and does not clump. [4][5]
Purrify
Activated carbon granules sold in bags. We suggest the 120g bag for most homes. Mix two tablespoons gently into fresh litter, then top up when the smell returns, with no fixed schedule. [7]
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View on PurrifyLitter materials side by side
Clay and corn litters here clump, while silica crystal does not, which shapes your scoop routine before any brand does. Cornell's Feline Health Center says most cats prefer unscented, finer-textured litter. That is general guidance, and the three clumping litters here are all sold as unscented.
[1][3][4][6]What to look for on a label
A feature name describes how the litter is made, not how it will perform in your box.
[2][3][1]- Material: clay, corn or silica sets the scoop routine.
- Scent wording: Fresh Step says 'no added fragrances or dyes' and uses 'fragrance-free' in its FAQ. World's Best says 'no artificial perfumes,' which speaks only to artificial perfumes. Read each maker's exact words.
- Odor features: charcoal and Ammonia Block Technology are design details, not results.
- Size: a small jug lets you try a litter before a large bag.
Matching litter to your home
These picks are editorial judgment, based on the specs above. Choose Tidy Cats if you want charcoal and the widest choice of container sizes, Fresh Step Simply Unscented if a named odor feature matters, World's Best for plant-based clumping, and Fresh Step Crystals only if you can live without clumps.
Purrify is an additive you mix into whichever litter you pick.
[1][2][3][4][7]What this page can and cannot tell you
This is a desk comparison, and we have not tested these litters. The judgments rest on each maker's published details and one Cornell veterinary page, last updated January 2015. A maker claim stays the maker's claim, so the page gives no scores and ranks no litter above another on odor.
[6][7]How we compare
These are desk comparisons. We read what the makers publish, set the products side by side and pick by fit. We have not tested the products ourselves, so the pages report no measured results, no lab figures and no numerical ratings. Every comparison lists its sources.
Sources checked
- Purina, Tidy Cats Free & Clean Unscented product page Source read on 2026-10-23
- Fresh Step, Simply Unscented litter page Source read on 2026-10-23
- World's Best Cat Litter, Multiple Cat Unscented page Source read on 2026-10-23
- Fresh Step FAQ, Fresh Step Crystals Source read on 2026-10-23
- Wholesale listing, Fresh Step Litter Box Scent Crystals Source read on 2026-10-23
- Cornell Feline Health Center, house soiling tips (updated January 2015) Source read on 2026-10-23
- Purrify products Source read on 2026-10-23