Instachew Purrclean vs PetSafe ScoopFree Crystal Pro
Researched by Riley Hart · prices checked Nov 4, 2026
As of Nov 4, 2026, the Instachew Purrclean costs $320 and the PetSafe ScoopFree Crystal Pro costs $250, so the PetSafe ScoopFree Crystal Pro is $70 cheaper. The Instachew Purrclean has a published review score and ranks #8 in our self cleaning litter boxes ranking; the PetSafe ScoopFree Crystal Pro is not scored yet. Pick the Instachew Purrclean for small cats in small spaces. Pick the PetSafe ScoopFree Crystal Pro for one small or average cat on a low upfront budget. They split the points we can measure, 1 each.
Who wins, point by point
They split the points we can measure, 1 each. Built from today's prices, the specs and independent tests for these two robots.
| Purrclean | ScoopFree Crystal Pro | Winner | |
|---|---|---|---|
| Price today | $320 | $250 | ScoopFree Crystal Pro |
| 3 year cost | $320 | $1,090 | Purrclean |
- You care most about 3 year cost ($320 vs $1,090)
- Best for small cats in small spaces
- You want to spend less (saves $70)
- Best for one small or average cat on a low upfront budget
- Cat weight
- At least 2.5 kg
- Litter
- Clumping litters
- Waste drawer
- About 8 L drawer
Compact app connected drum box suited to small cats
Full Instachew Purrclean review, pros and cons →- Litter
- PetSafe ScoopFree
- Waste drawer
- Waste raked under a lid
Low cost rake box using sealed crystal trays, no app
Full PetSafe ScoopFree Crystal Pro review, pros and cons →Side by side
| Instachew Purrclean | PetSafe ScoopFree Crystal Pro | |
|---|---|---|
| Price | $320 | $250 |
| 3 year cost | $320 | $1,090 |
| Our score | 7.3/10 | Not scored yet |
| Rank in Litter box | #8 | #17 |
| Status | on sale | on sale |
| Warranty | n/a | n/a |
| Cat weight range | At least 2.5 kg (5.5 lb) and over 6 months (Chewy listing); no maximum published, reviewers say large cats do not fit | Not stated; an 11 lb cat fit the hood just barely (TechnoMEOW) |
| Max cats | Not published; Cats.com found only 3 of 7 cats small enough to use it | Not stated; best with one average size cat (TechnoMEOW) |
| Waste drawer | About 8 L drawer with bag liner (Chewy listing) | Waste raked under a lid in the tray; tray lasts up to 30 days for one cat |
| Sensors | 12 safety sensors (Cats.com); infrared cat detection within 50 cm of the opening and a foreign object sensor (TechnoMeow) | Motion and safety sensors; rake waits 20 minutes after use |
| App | Instachew Infinity app for schedules, cat weights and visit logs; 2.4 and 5 GHz Wi-Fi (TechnoMeow) | None; health counter display only |
| Litter type | Clumping litters including tofu, soil and mixed (TechnoMeow, Chewy) | PetSafe ScoopFree crystal trays only |
| Size | 19 x 20 x 26 in, 32 lb (TechnoMeow); inner 46 x 42 cm, entry 9 in off the floor (Chewy) | 28.2 x 20.4 x 16 in (TechnoMEOW), 18 lb assembled |
| Noise | 47 dB (figure cited by TechnoMeow) | n/a |
| Best for | small cats in small spaces | one small or average cat on a low upfront budget |
| Skip if | you have cats over about 12 lb | you have several cats or a large cat |
Specs are maker claims unless a reviewer is named. Prices from the stores we link, checked daily.
What reviewers found
Instachew Purrclean
- Cats.com (3.6/5): Tested about six weeks in a seven cat home; only three cats were small enough, drum removal was awkward, app pairing was slow and nearby cats set off many alerts. Source
- TechnoMeow (3.5/5): Tested on a friend's unit; a Siamese fit but a Bengal did not, the app disconnected often, some litter went unsifted and odors lingered. Source
PetSafe ScoopFree Crystal Pro
- TechnoMEOW: About a month with one 11 lb cat: visitors could not smell it at the 30 day mark, but the cat fit the hood just barely and some crystals tracked out. Source
- NBC Select: The writer used two Crystal Pro units; clumps got stuck in the rake and each unit broke or malfunctioned after about six months. Source
Questions buyers ask
Which is better, the Instachew Purrclean or the PetSafe ScoopFree Crystal Pro?
The Instachew Purrclean has a published review score and ranks #8 in our self cleaning litter boxes ranking; the PetSafe ScoopFree Crystal Pro is not scored yet. Pick the Instachew Purrclean for small cats in small spaces. Pick the PetSafe ScoopFree Crystal Pro for one small or average cat on a low upfront budget.
Which is cheaper?
The PetSafe ScoopFree Crystal Pro at $250, versus $320 for the Instachew Purrclean, checked Nov 4, 2026. Over 3 years with running costs: $320 vs $1,090.
What is the difference between the Purrclean and the ScoopFree Crystal Pro?
Cat weight range: At least 2.5 kg (5.5 lb) and over 6 months (Chewy listing); no maximum published… on the Purrclean, Not stated; an 11 lb cat fit the hood just barely (TechnoMEOW) on the ScoopFree Crystal Pro. Max cats: Not published; Cats.com found only 3 of 7 cats small enough to use it on the Purrclean, Not stated; best with one average size cat (TechnoMEOW) on the ScoopFree Crystal Pro. Waste drawer: About 8 L drawer with bag liner (Chewy listing) on the Purrclean, Waste raked under a lid in the tray; tray lasts up to 30 days for one cat on the ScoopFree Crystal Pro.
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