Sustainably Yours is the strongest all-around pick in this comparison for best-performing natural litter shoppers.
Flushable, lightweight, and eco-friendly corn litter with surprisingly strong clumping for a natural option.
A premium natural litter with harder clumping than most plant-based options and bright white granules for easy health monitoring.
World's Best is the corn litter most people start with. Sustainably Yours is the one that clumps harder and keeps more litter inside the tray. Both flush and both are light to carry, and Sustainably Yours costs a little more each day.
This comparison page is maintained by the ReviewCatLitter editorial team and grounded in the same scoring framework used across the published review catalog.
We own Purrify.
Choose between them on texture, clumping, dust and price. Then, if the room still tells you where the box is, Purrify is activated carbon you mix into whichever bag you chose. It is what we use in our own homes.
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Every figure below is a reading from our own test runs, not a rating. Where a run never took a reading it says so.
| Reading | World's Best Cat Litter | Sustainably Yours | Gap |
|---|---|---|---|
| Dust weighed per pourParticulates caught in the air while the bag goes into the box. Lower is better. | 0.15 mg | 0.11 mgbetter | 0.04 mg |
| Clumps that survived the drop testShare of clumps still whole after a three-foot drop. Higher is better. | 76% | not measured | only one side measured |
| Ammonia after one dayParts per million above the tray, 24 hours in. Lower is better. | 2 ppm | not measured | only one side measured |
| Bag priceWhat the tested bag cost. Bag sizes differ, so read it next to cost per pound. | $29.99 | $29.99 | level |
| Cost per poundBag price divided by what is in the bag. Lower is better. | $1.07better | $1.15 | $0.08 |
| Cost per dayWhat the box costs to keep running each day. Lower is better. | $0.58better | $0.63 | $0.05 |
| Cost across a yearThat daily cost carried over a full year of use. Lower is better. | $212better | $230 | $18 |
Neither run recorded granules outside the box and ammonia after three days, so those rows are left out rather than filled in from a similar bag. The full test data shows every reading we have.
Primary tradeoff: Sustainably Yours's weakest area here is value.
Best dust control here at 0.11mg per pour.
Strongest odor control in this set with better than standard corn.
Clumping is a real edge: excellent for natural litter.
| Product | ||
|---|---|---|
| Overall Score | 9.1 | 9.3 |
| Pricing | ||
| Price | $29.99 | $29.99 |
| Weight | 28 lbs | 26 lbs |
| Cost / Day | $0.58 | $0.63 |
| Performance | ||
| Dust Control | 7.8 0.15mg per pour | 8.8 0.11mg per pour |
| Clumping | 9 Excellent for corn | 9.3 Excellent for natural litter |
| Odor Control | 8.2 Good with daily scooping | 8.6 Better than standard corn |
| Tracking Outside the Box | 9 Minimal | 8.4 Low |
| Value for Cost | 7.2 $0.58/day · $29.99 | 7.8 $0.63/day · $29.99 |
| Features | ||
| Type | Corn Litter | Natural Corn + Cassava |
| Flushable | ||
| Scented | No | No |
| Our Verdict | ||
| Best For | Eco-conscious owners who want flushable litter | Best-performing natural litter shoppers |
| Read ReviewCheck Price | Read ReviewCheck Price | |
World's Best Cat Litter makes the most sense for eco-conscious owners who want flushable litter.
You want eco-friendly and flushable litter with very good daily usability.
You're on a tight budget or want the absolute lowest dust numbers.
Sustainably Yours makes the most sense for best-performing natural litter shoppers.
You want a premium natural litter with harder clumping than most plant-based options and bright white granules for easy health monitoring.
You need a formula that solves best-performing natural litter shoppers better.
The nearest options to this matchup on score and on price.
Weighed 0.04mg per pour and runs at $0.55 a day.
Weighed 0.04mg per pour and runs at $0.56 a day.
Weighed 0.15mg per pour and runs at $0.72 a day.
Sustainably Yours comes out ahead on the balance of dust, clumping, odor control, tracking and daily cost. World's Best Cat Litter is still the one to buy for eco-conscious owners who want flushable litter.
World's Best Cat Litter runs at $0.58 a day against $0.63 for Sustainably Yours.
Sustainably Yours scored higher: better than standard corn, against good with daily scooping for World's Best Cat Litter.
World's Best Cat Litter keeps more litter in the box: minimal, against low for Sustainably Yours.
Ultra clumps harder and costs less per day. Sustainably Yours flushes, weighs far less to carry home, and keeps more litter inside the box.
Ultra is the cleaner and cheaper daily litter. World's Best is the one to pick if you want to flush the waste and stop hauling heavy bags.
Clump & Seal is the cheap perfumed clay. World's Best is the flushable corn litter with no added scent.
Naturally Fresh is the cheaper natural bag and clumps nearly as hard. Sustainably Yours flushes and tracks less.
Sustainably Yours suits a cat that wants a sand-like litter it can dig. Catalyst suits a cat that wants wood without pellets underfoot.
Both are premium plant litters and both flush. Tuft + Paw is far lighter on dust and leaves almost nothing on the floor.