3 Best Automatic Litter Boxes [2026]
Compare three self-cleaning litter boxes by cat weight, litter type, supplies and setup: a sifting globe, a crystal-tray rake and an app-controlled cylinder.
By Marvin SmitEditor, The Pet Shortlist · Not hands-on tested01 / For clumping litter and app tracking
Linked variant: White, Litter-Robot 4 unit only (not a bundle). Confirm this version before ordering.
AMAZON LISTING
Good fit forUp to four cats of at least 3 lb that already use clumping clay litter.
Not suited toKittens under 3 lb in automatic mode, or litters Whisker lists as unsuitable, such as non-clumping or pellet litter.
As an Amazon Associate I earn from qualifying purchases.
CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
02 / For crystal trays instead of scooping
Linked variant: Covered (hooded), Black, with one disposable crystal tray. Confirm this version before ordering.
AMAZON LISTING
PetSafe ScoopFree Crystal Pro Self-Cleaning Litter Box
Good fit forA cat over 6 months that is fine with non-clumping crystal litter in a tray you swap about monthly.
Not suited toA kitten under 6 months, clumping litter, or avoiding an ongoing tray purchase.
As an Amazon Associate I earn from qualifying purchases.
CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
03 / For a lower entry and app modes
Linked variant: White, basic bundle with N50 2.0 deodorizer and 20 waste bags. Confirm this version before ordering.
AMAZON LISTING
PETKIT PuraMax 2 Automatic Litter Box
Good fit forCats from 3.3 to 22 lb and over 6 months, using clumping litter, with the box on a hard, flat floor.
Not suited toA kitten under 6 months, or a spot where it would stand on carpet or a mat.
As an Amazon Associate I earn from qualifying purchases.
CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
THE QUICK VERDICT
Start with the litter your cat already uses.
If your cat already uses clumping clay litter and weighs at least 3 lb, start with the Whisker Litter-Robot 4. It sifts the litter after each visit and keeps the waste in a drawer. If you would rather not handle litter at all, look at the PetSafe ScoopFree Crystal Pro. A rake pushes waste into a covered trap, and you swap the whole crystal tray about once a month for one cat. If you use clumping litter and want app modes and a 7.87-inch entry, compare the PETKIT PuraMax 2.
These are suitability judgments from manufacturer documents and the verified Amazon listings, not hands-on testing. We have not measured noise, odor or how well any box cleans. Each brand sets a limit for kittens: a minimum weight for the Litter-Robot 4 and a minimum age for the other two.
Compare the three ↓In this guide
AT A GLANCE
Compare cat weight, litter and app
| Product | Best suited to | Cat weight & age | Litter | App |
|---|---|---|---|---|
| Whisker Litter-Robot 4 | For clumping litter and app tracking | 3–25 lb per cat in Automatic Mode; under 3 lb use semi-automatic mode (Whisker) | Clumping clay recommended. Whisker says non-clumping, newspaper and wood pellet litters do not work and plant-based litters typically do not. Some silica crystals can work if they pass through the screen, but Whisker does not recommend clear or white litter, which can upset the litter-level and drawer-full readings. | Whisker app for monitoring and settings over 2.4 GHz Wi-Fi (5 GHz not supported); the unit also has a five-button control panel. Whisker does not say whether cleaning works without the app. |
| PetSafe ScoopFree Crystal Pro Self-Cleaning Litter Box | For crystal trays instead of scooping | No weight range stated by PetSafe; keep it unplugged until a kitten is at least 6 months old (PetSafe guide) | Only official ScoopFree crystal trays, disposable or reusable. PetSafe says the box will not work with other trays. | No app; a built-in rake counter (PetSafe calls it a health counter) goes up by one each time the rake runs, and a light shows when to change the tray |
| PETKIT PuraMax 2 Automatic Litter Box | For a lower entry and app modes | 3.3–22 lb; not for pets under 6 months (PETKIT listing on Amazon) | Most clumping litters (PETKIT listing on Amazon) | PETKIT app sets auto, manual, timer and empty modes and logs visits over 2.4 GHz Wi-Fi. The listing does not say which functions work without the app. |
Whisker Litter-Robot 4
- Best suited to
- For clumping litter and app tracking
- Cat weight & age
- 3–25 lb per cat in Automatic Mode; under 3 lb use semi-automatic mode (Whisker)
- Litter
- Clumping clay recommended. Whisker says non-clumping, newspaper and wood pellet litters do not work and plant-based litters typically do not. Some silica crystals can work if they pass through the screen, but Whisker does not recommend clear or white litter, which can upset the litter-level and drawer-full readings.
- App
- Whisker app for monitoring and settings over 2.4 GHz Wi-Fi (5 GHz not supported); the unit also has a five-button control panel. Whisker does not say whether cleaning works without the app.
PetSafe ScoopFree Crystal Pro Self-Cleaning Litter Box
- Best suited to
- For crystal trays instead of scooping
- Cat weight & age
- No weight range stated by PetSafe; keep it unplugged until a kitten is at least 6 months old (PetSafe guide)
- Litter
- Only official ScoopFree crystal trays, disposable or reusable. PetSafe says the box will not work with other trays.
- App
- No app; a built-in rake counter (PetSafe calls it a health counter) goes up by one each time the rake runs, and a light shows when to change the tray
PETKIT PuraMax 2 Automatic Litter Box
- Best suited to
- For a lower entry and app modes
- Cat weight & age
- 3.3–22 lb; not for pets under 6 months (PETKIT listing on Amazon)
- Litter
- Most clumping litters (PETKIT listing on Amazon)
- App
- PETKIT app sets auto, manual, timer and empty modes and logs visits over 2.4 GHz Wi-Fi. The listing does not say which functions work without the app.
The weight and age limits come from each brand. PetSafe does not list a weight range for this model, only that a kitten should be at least 6 months old before the box is plugged in.
01 / FOR CLUMPING LITTER AND APP TRACKING
Whisker Litter-Robot 4
LR4-0101-00-US · White, Litter-Robot 4 unit only (not a bundle)
Good fit for
Up to four cats of at least 3 lb that already use clumping clay litter.
Not suited to
Kittens under 3 lb in automatic mode, or litters Whisker lists as unsuitable, such as non-clumping or pellet litter.
Amazon link opens: White, Litter-Robot 4 unit only (not a bundle).
AMAZON LISTING
View on Amazon ↗As an Amazon Associate I earn from qualifying purchases.
CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
What stands out
- Sifts clumping litter after each visit and keeps waste in a drawer.
- Rated by Whisker for up to four cats from 3 to 25 lb.
The trade-offs
- Large footprint: 22 × 27 in and 29.5 in tall.
- Whisker says non-clumping, newspaper and pellet litters do not work, and plant-based litters typically do not.
- Size
- 22 × 27 in footprint (Whisker); 29.5 in tall (Amazon catalog)
- Entry
- 15.75 × 15.75 in entryway, 16.5 in interior height (Whisker); height of the entry above the floor not verified
- Waste
- Waste drawer; Whisker says emptying can be as rare as every 8 days, depending on your cats
- Power
- 15 V DC power supply
- App
- Whisker app for monitoring and settings over 2.4 GHz Wi-Fi (5 GHz not supported); the unit also has a five-button control panel. Whisker does not say whether cleaning works without the app.
- Cleaning
- Replace the drawer liner each time you empty it. Whisker recommends a new carbon filter and OdorTrap packs every 2–4 weeks, but says how often is up to you and your cats.
Whisker lists a 22 × 27-inch footprint. The Amazon catalog lists 27 × 24.25 × 29.5 inches for the same listing. We show both, so measure your space with some room to spare. This link is the Litter-Robot 4 on its own; Amazon also sells bundles with extra supplies under other listings.
Manufacturer details and the exact Amazon listing were checked 2026-11-01. Confirm the exact model and current US availability before ordering.
02 / FOR CRYSTAL TRAYS INSTEAD OF SCOOPING
PetSafe ScoopFree Crystal Pro Self-Cleaning Litter Box
ZAL00-18159 · Covered (hooded), Black, with one disposable crystal tray
Good fit for
A cat over 6 months that is fine with non-clumping crystal litter in a tray you swap about monthly.
Not suited to
A kitten under 6 months, clumping litter, or avoiding an ongoing tray purchase.
Amazon link opens: Covered (hooded), Black, with one disposable crystal tray.
AMAZON LISTING
PetSafe ScoopFree Crystal Pro Self-Cleaning Litter Box, Covered, Black
View on Amazon ↗As an Amazon Associate I earn from qualifying purchases.
CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
What stands out
- The rake runs 20 minutes after your cat leaves and pushes waste into a covered trap.
- No app or Wi-Fi to set up; a counter goes up each time the rake runs.
The trade-offs
- Works only with official ScoopFree trays, so you keep buying them.
- PetSafe says to keep it unplugged for kittens under 6 months.
- Size
- About 28.2 × 20.4 × 16 in (Amazon catalog; not listed on the PetSafe support page)
- Entry
- Front entry under the privacy hood; entry height not verified
- Waste
- One tray lasts 20–30 days for one cat, 10–15 days for two and 7–10 days for three or more (PetSafe guide)
- Power
- Plug-in power adaptor
- App
- No app; a built-in rake counter (PetSafe calls it a health counter) goes up by one each time the rake runs, and a light shows when to change the tray
- Cleaning
- Unplug, then wash the rake and waste trap cover in warm soapy water and wipe the frame and both sensors. No bleach or chemicals.
PetSafe's support page lists this covered model as PAL00-18017 and ZAL00-18159; the Amazon listing uses ZAL00-18159. The uncovered Crystal Pro Legacy and the Crystal Smart are different boxes and are not covered here.
Manufacturer details and the exact Amazon listing were checked 2026-11-01. Confirm the exact model and current US availability before ordering.
03 / FOR A LOWER ENTRY AND APP MODES
PETKIT PuraMax 2 Automatic Litter Box
P9902 · White, basic bundle with N50 2.0 deodorizer and 20 waste bags
Good fit for
Cats from 3.3 to 22 lb and over 6 months, using clumping litter, with the box on a hard, flat floor.
Not suited to
A kitten under 6 months, or a spot where it would stand on carpet or a mat.
Amazon link opens: White, basic bundle with N50 2.0 deodorizer and 20 waste bags.
AMAZON LISTING
PETKIT PuraMax 2 Automatic Litter Box, White
View on Amazon ↗As an Amazon Associate I earn from qualifying purchases.
CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
What stands out
- A 7.87 in entry height, which PETKIT describes as easier for older or short-legged cats.
- PETKIT says seven infrared and four weight sensors pause the cycle when a cat comes close.
The trade-offs
- Specifications come from PETKIT’s Amazon listing; PETKIT’s own website did not load during our check.
- Needs a hard, flat floor; carpets and mats may interfere with the sensors.
- Size
- About 24.21 × 21.96 × 21.96 in (Amazon catalog)
- Entry
- 7.87 in entry height (PETKIT listing on Amazon)
- Waste
- 7 L waste bin; PETKIT says up to 15 days of automatic scooping
- Power
- US adapter included
- App
- PETKIT app sets auto, manual, timer and empty modes and logs visits over 2.4 GHz Wi-Fi. The listing does not say which functions work without the app.
- Cleaning
- Cleaning steps not verified here; follow the included manual. PETKIT says to keep it on a flat floor, not carpet or mats.
PETKIT's own website did not load when we checked on November 1, 2026, so the weight range, age limit, bin size and entry height come from the product details PETKIT supplies on its Amazon listing. Check the manual in the box for cleaning steps.
Manufacturer details and the exact Amazon listing were checked 2026-11-01. Confirm the exact model and current US availability before ordering.
How each box cleans itself
The Litter-Robot 4 turns its globe to sift clumps out of the clean litter and stores them in a waste drawer. Whisker calls this its patented sifting process. Whisker says a laser and weight sensor notice when a cat goes in and out. The cycle starts a few minutes after your cat leaves, and you can set the wait to up to 30 minutes.
The ScoopFree Crystal Pro does not use clumps. Crystal litter soaks up urine, and a rake pushes solid waste into a covered trap at the end of the tray. PetSafe's guide says the rake starts a 20-minute countdown when your cat leaves. If your cat comes back during the countdown, the box waits.
The PuraMax 2 runs a cleaning cycle in its cylinder after each use and keeps waste in a sealed 7-liter bin. PETKIT says seven infrared sensors and four weight sensors watch the area, and the box pauses when a cat comes close. You can choose automatic, manual, timer or empty mode in the app.
Kittens and small cats
An automatic box moves on its own, so the brands set limits for small cats.
- Litter-Robot 4: Whisker recommends semi-automatic mode for kittens under 3 lb. Leave the unit off or unplugged. When your kitten has used it, wait about 7 minutes for the waste to clump. Then switch it on to clean, and switch it off again afterward. Whisker says to keep doing this, supervised, until your kittens reach 3 lb.
- ScoopFree Crystal Pro: PetSafe says to leave it unplugged and scoop by hand until a kitten is at least 6 months old.
- PuraMax 2: PETKIT says not to use it for pets under 6 months.
Until then, a plain box may be simpler. See our regular litter box guide for sizing help. Your veterinarian is the right person to ask about your own kitten's needs.
Ongoing supplies to plan for
- Whisker Litter-Robot 4Waste drawer liners, carbon filters and optional OdorTrap packs (a Whisker add-on for odor). Waste drawer; Whisker says emptying can be as rare as every 8 days, depending on your cats.
- PetSafe ScoopFree Crystal Pro Self-Cleaning Litter BoxScoopFree disposable crystal trays, or ScoopFree reusable trays refilled with crystals. One tray lasts 20–30 days for one cat, 10–15 days for two and 7–10 days for three or more (PetSafe guide).
- PETKIT PuraMax 2 Automatic Litter BoxWaste bags and N50 deodorizer refills (PETKIT calls N50 an odor remover for the waste bin). 7 L waste bin; PETKIT says up to 15 days of automatic scooping.
For the ScoopFree, the tray is the litter. PetSafe says one tray lasts 20 to 30 days for one cat. It lasts 10 to 15 days for two cats, and 7 to 10 days for three or more. The box only works with official ScoopFree trays. The other two use clumping litter that you top up yourself. Whisker recommends a new carbon filter and OdorTrap packs every two to four weeks, but says how often is up to you and your cats.
Automatic litter box FAQs
Is an automatic litter box the same as a self-cleaning litter box?
Brands use both names for the same kind of box: one that removes waste after your cat leaves. You still empty a drawer, bin or tray and clean the box from time to time.
How many automatic boxes do I need for several cats?
Whisker rates the Litter-Robot 4 for up to four cats, and PetSafe gives shorter tray times for more cats. Cat Friendly Homes recommends one litter box per cat plus one extra in general. An automatic box still counts as one box.
Can I put one on carpet?
Whisker says its weight sensor is most accurate on a firm surface, not carpet. PETKIT says not to put the PuraMax 2 on carpets or mats, because they may interfere with its sensors.
Do I need Wi-Fi?
The Litter-Robot 4 and PuraMax 2 connect to their apps over 2.4 GHz Wi-Fi. Neither brand says clearly which functions keep working without the app, so ask the brand if you will not have Wi-Fi. The Litter-Robot 4 also has a five-button control panel. The ScoopFree Crystal Pro has no app and no Wi-Fi; its counter goes up each time the rake runs.
My cat is unsure about the new box. What helps?
PetSafe says many cats use a new box right away, while others take longer, and suggests leaving the hood off until your cat is comfortable. For the other two, follow the instructions that come with your model.
Have any of these boxes been recalled?
We searched the U.S. Consumer Product Safety Commission recall database on November 1, 2026 and found no recall listing that matches these brands' automatic litter boxes. That is not a safety guarantee, so check again before you buy.
Are these hands-on reviews?
No. This compares manufacturer documents and the verified Amazon listing for each exact model. We have not tested the boxes.
Sources & how we chose
We picked three boxes that clean in different ways: a sifting globe, a rake over crystal litter and an app-controlled cylinder. Then we checked each brand's published details against the exact Amazon listing. We did not use commission to order the list, and we left out star ratings, buyer claims, price, stock and medical claims.
- Whisker: Litter-Robot 4 product page and FAQ — checked 2026-11-01
- PetSafe: ScoopFree Crystal Pro Hooded support page — checked 2026-11-01
- PetSafe: ScoopFree Crystal Pro Hooded user guide (PDF) — checked 2026-11-01
- PETKIT: PuraMax 2 product page — did not load on 2026-11-01; details taken from PETKIT's Amazon listing
- U.S. CPSC recall database (SaferProducts.gov) — searched 2026-11-01
- Cat Friendly Homes (Feline VMA): litter box guidance — checked 2026-10-11
All three Amazon listings were checked on 2026-11-01: Whisker Litter-Robot 4 (LR4-0101-00-US, White, unit only), PetSafe ScoopFree Crystal Pro (ZAL00-18159, Covered, Black, one box with one tray) and PETKIT PuraMax 2 (P9902, White, basic bundle with N50 2.0 and 20 bags). Noise, odor, cleaning quality and durability have not been verified.
Read our selection method ↗
Editor of The Pet Shortlist. This guide summarizes cited manufacturer sources and the verified Amazon catalog; it does not claim veterinary expertise or hands-on testing.
Keep exploring
Cat essentials ↗Regular cat litter boxes guide ↗
How we label evidence ↗