Arm & Hammer HardBall is the strongest all-around pick in this comparison for fast hard clumping on a mid-range budget.
Fast-forming hard clumps with baking soda odor help, making it a strong mid-range clay pick if you can tolerate moderate dust.
A grocery-store staple with broad availability, lots of variants, and okay overall performance without excelling anywhere specific.
HardBall is the upgrade most Tidy Cats buyers actually want: the same aisle, firmer and faster clumps, a bit more per day. Tidy Cats stays the cheaper habit and comes in more variants than anything else on the shelf.
This comparison page is maintained by the ReviewCatLitter editorial team and grounded in the same scoring framework used across the published review catalog.
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.
Read our Purrify guide to picking a litter for odor control.
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 | Arm & Hammer HardBall | Purina Tidy Cats | Gap |
|---|---|---|---|
| Dust weighed per pourDust caught on a filter and weighed while the bag goes into the box. Lower is better. | 0.48 mgbetter | 0.50 mg | 0.02 mg |
| Clumps that survived the drop testShare of clumps still whole after a three-foot drop. Higher is better. | 87%better | 62% | 25 points |
| Bag priceWhat the tested bag cost. Bag sizes differ, so read it next to cost per pound. | $19.99 | $15.49 | $4.50 |
| Cost per poundBag price divided by what is in the bag. Lower is better. | $0.53 | $0.44better | $0.09 |
| Cost per dayWhat the box costs to keep running each day. Lower is better. | $0.47 | $0.39better | $0.08 |
| Cost across a yearThat daily cost carried over a full year of use. Lower is better. | $172 | $142better | $30 |
Neither run recorded granules outside the box, ammonia after one day 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: Arm & Hammer HardBall's weakest area here is dust control.
Best dust control here at 0.48mg per pour.
Strongest odor control in this set with baking soda support.
Clumping is a real edge: hard and fast.
Scroll sideways to see every litter. Scores are editorial judgments out of 10.
| Product | ||
|---|---|---|
| Overall Score | 8.5Very good | 7.9Fair |
| Pricing | ||
| Price | $19.99 | $15.49 |
| Weight | 38 lbs | 35 lbs |
| Cost / Day | $0.47 | $0.39 |
| Performance | ||
| Dust Control | 6 0.48mg per pour | 5.8 0.50mg per pour |
| Clumping | 9 Hard and fast | 7.2 Average |
| Odor Control | 8 Baking soda support | 7.5 Solid for budget clay |
| Tracking Outside the Box | 6 Moderate | 5.9 Moderate-high |
| Value for Cost | 8 $0.47/day · $19.99 | 8.2 $0.39/day · $15.49 |
| Features | ||
| Type | Fast-Clumping Clay | Budget Clumping Clay |
| Flushable | ||
| Scented | Yes | Yes |
| Our Verdict | ||
| Best For | Fast hard clumping on a mid-range budget | Easy grocery-store replenishment |
| Read ReviewCheck Price | Read ReviewCheck Price | |
Arm & Hammer HardBall makes the most sense for fast hard clumping on a mid-range budget.
You want fast-forming hard clumps with baking soda odor help, making it a strong mid-range clay pick if you can tolerate moderate dust.
You need a formula that solves fast hard clumping on a mid-range budget better.
Purina Tidy Cats makes the most sense for easy grocery-store replenishment.
You want a grocery-store staple with broad availability, lots of variants, and okay overall performance without excelling anywhere specific.
You need a formula that solves fast hard clumping on a mid-range budget better.
The nearest options to this matchup on score and on price.
Weighed 0.00mg per pour and runs at $0.52 a day.
Weighed 0.45mg per pour and runs at $0.43 a day.
Weighed 0.08mg per pour and runs at $0.31 a day.
Arm & Hammer HardBall comes out ahead on the balance of dust, clumping, odor control, tracking and daily cost. Purina Tidy Cats is still the one to buy for easy grocery-store replenishment.
Purina Tidy Cats runs at $0.39 a day against $0.47 for Arm & Hammer HardBall.
Arm & Hammer HardBall scored higher: baking soda support, against solid for budget clay for Purina Tidy Cats.
Arm & Hammer HardBall keeps more litter in the box: moderate, against moderate-high for Purina Tidy Cats.
Clump & Seal is worth the step up from Tidy Cats if smell is the reason you are shopping. Tidy Cats is cheaper by the bag and easier to find.
Ultra is the cleaner litter. HardBall is the cheaper way to get clumps that set fast and come out in one piece.
Ultra beat Tidy Cats on every performance reading we took, so this comes down to whether you will pay more per day.
Two Arm & Hammer clays built for different things. Clump & Seal is about fragrance and a low bag price.
Tidy Cats is the cheap habit. World's Best is the upgrade that flushes, stays in the tray, and stops the cloud when you pour.
HardBall is the cheaper way to get clumps that set fast and lift whole. Cat Attract only earns its price if your cat has stopped using the tray.