Clumping Clay
Arm & Hammer HardBall
Fast-forming hard clumps with baking soda odor help, making it a strong mid-range clay pick if you can tolerate moderate dust.
Overall score
8.5/10
Cost per day
$0.47
Reviewed Nov 28, 2025
Head-to-head comparison
Arm & Hammer HardBall vs Purina Tidy Cats: Which Should You Buy?
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.
ReviewCatLitter editorial teamUpdated Feb 28, 2026
This comparison page is maintained by the ReviewCatLitter editorial team and grounded in the same scoring framework used across the published review catalog.
Clumping Clay (Budget)
Purina Tidy Cats
A grocery-store staple with broad availability, lots of variants, and okay overall performance without excelling anywhere specific.
Overall score
7.9/10
Cost per day
$0.39
Reviewed Feb 28, 2026
Overall winner
Arm & Hammer HardBall
Arm & Hammer HardBall is the strongest all-around pick in this comparison for fast hard clumping on a mid-range budget.
Lowest daily cost
Purina Tidy Cats at $0.39/day
Budget is often the deciding factor in this tier.
Best odor control
Arm & Hammer HardBall at Baking soda support
Odor control often decides whether a litter feels tolerable long term.
Tracks less outside the box
Arm & Hammer HardBall at Moderate
Tracking can be more important than overall score in small spaces.
What we actually measured
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 pourParticulates caught in the air 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.
Why Arm & Hammer HardBall wins this matchup
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.
| Product | ||
|---|---|---|
| Overall Score | 8.5 | 7.9 |
| 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 | |
Best fit
Arm & Hammer HardBall
Arm & Hammer HardBall makes the most sense for fast hard clumping on a mid-range budget.
Worth it if
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.
Skip it if
You need a formula that solves fast hard clumping on a mid-range budget better.
Best fit
Purina Tidy Cats
Purina Tidy Cats makes the most sense for easy grocery-store replenishment.
Worth it if
You want a grocery-store staple with broad availability, lots of variants, and okay overall performance without excelling anywhere specific.
Skip it if
You need a formula that solves fast hard clumping on a mid-range budget better.
If neither option is quite right
The closest litters we have tested to this matchup, on score and on price.
Paper Pellet
Ökocat Paper Pellet
Weighed 0.00mg per pour and runs at $0.52 a day.
Best for post-surgery or severe dust sensitivity
Scented Clumping Clay
Arm & Hammer Clump & Seal
Weighed 0.45mg per pour and runs at $0.43 a day.
Best for budget shoppers prioritizing odor control
Pine Pellet
Feline Pine
Weighed 0.08mg per pour and runs at $0.31 a day.
Best for pellet users and sifting boxes
Read the full reviews
Use this page to choose a winner quickly, then open the full product reviews if you want the long-form test notes.
Keep comparing nearby options
Related matchups that share one of the same products and answer the next likely decision.
Related matchup
Arm & Hammer Clump & Seal vs 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.
Winner: Arm & Hammer Clump & Seal
Related matchup
Dr. Elsey's Ultra vs Arm & Hammer HardBall
Ultra is the cleaner litter. HardBall is the cheaper way to get clumps that set fast and come out in one piece.
Winner: Dr. Elsey's Ultra
Related matchup
Dr. Elsey's Ultra vs Purina Tidy Cats
Ultra beat Tidy Cats on every performance reading we took, so this comes down to whether you will pay more per day.
Winner: Dr. Elsey's Ultra
Related matchup
Arm & Hammer Clump & Seal vs Arm & Hammer HardBall
Two Arm & Hammer clays built for different things. Clump & Seal is about fragrance and a low bag price.
Winner: Arm & Hammer Clump & Seal
Related matchup
Purina Tidy Cats vs World's Best Cat Litter
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.
Winner: World's Best Cat Litter
Related matchup
Dr. Elsey's Cat Attract vs Arm & Hammer HardBall
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.
Winner: Dr. Elsey's Cat Attract
Quick Answers
Which is better: Arm & Hammer HardBall or Purina Tidy Cats?
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.
Which is cheaper per day: Arm & Hammer HardBall or Purina Tidy Cats?
Purina Tidy Cats runs at $0.39 a day against $0.47 for Arm & Hammer HardBall.
Which controls smell better: Arm & Hammer HardBall or Purina Tidy Cats?
Arm & Hammer HardBall scored higher: baking soda support, against solid for budget clay for Purina Tidy Cats.
Which tracks less outside the litter box: Arm & Hammer HardBall or Purina Tidy Cats?
Arm & Hammer HardBall keeps more litter in the box: moderate, against moderate-high for Purina Tidy Cats.