# Litter-Robot 5 vs 4 vs EVO: Which to Buy in 2026 > Litter-Robot 5 vs 4 vs EVO: weight and cat limits, entry sizes, sensors, WasteID and Whisker+, prices and running costs, and which Litter-Robot fits your… - Source: https://selfcleaninglitterboxguide.com/posts/litter-robot-5-vs-litter-robot-4-vs-evo/ - Markdown version: https://selfcleaninglitterboxguide.com/posts/litter-robot-5-vs-litter-robot-4-vs-evo.md - Last updated: 2026-11-12 --- - [Home](https://selfcleaninglitterboxguide.com/) - [Guides](https://selfcleaninglitterboxguide.com/guides/) - Litter-Robot 5 vs Litter-Robot 4 vs EVO: Which Litter-Robot to Buy in 2026 Which to buy # Litter-Robot 5 vs Litter-Robot 4 vs EVO: Which Litter-Robot to Buy in 2026 Updated November 12, 2026 By [Self-Cleaning Litter Box Guide Editorial Team](https://selfcleaninglitterboxguide.com/about/) [How we research](https://selfcleaninglitterboxguide.com/how-we-research/) Prices are approximate and change often, so check the current price before you buy. ## Key takeaways - The three current Litter-Robots differ mainly in limits: **LR5 3–30 lb and up to five cats**, **LR4 3–25 lb and up to four**, **EVO 3–19 lb and up to two** (Whisker). - The LR4 and LR5 pair a laser curtain with weight sensors. The **EVO relies on weight sensors only** and has a slightly smaller 14.85 in entry. - The LR5's headline feature, **WasteID**, tells urine from stool visits, but it needs Whisker+ (about $80 a year, per WIRED) and worked only intermittently in WIRED's first four months. - WIRED found the LR5's touchscreen finicky and **preferred the LR4's physical buttons**. For most one- to four-cat homes, the LR4 or EVO is the better buy. - The **Litter-Robot 3 Connect is discontinued**, per Whisker. If you see one secondhand, note it needed cats of at least 5 lb for automatic mode. ## Our top picks - 1![Whisker Litter-Robot 4](https://selfcleaninglitterboxguide.com/_astro/whisker-litter-robot-4.CZhanV3w_12M27U.webp)Best for most homes with three or four cats: 3–25 lb, laser and weight sensors, about $699–749[Whisker Litter-Robot 4](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-4/)Rotating globe · 3–25 lb · up to 4 cats8.7**$$$**$PremiumPrice tier: Premium[Check price on Amazon](https://www.amazon.com/dp/B0BH6MD3DJ?tag=selfcleaninglitterboxguide.com-20) - 2![Whisker Litter-Robot EVO](https://selfcleaninglitterboxguide.com/_astro/whisker-litter-robot-evo.qVzR9iO0_sr869.webp)Best for one or two average-size cats and small spaces: 3–19 lb, about $599[Whisker Litter-Robot EVO](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-evo/)Rotating globe · 3–19 lb · up to 2 cats8.6**$$$**$PremiumPrice tier: Premium[Check price](https://www.amazon.com/dp/B0G6GDC4VN?tag=selfcleaninglitterboxguide.com-20) - 3![Whisker Litter-Robot 5](https://selfcleaninglitterboxguide.com/_astro/whisker-litter-robot-5.JMut0Qu8_Z1BLhyu.webp)Best for very big cats and five-cat homes: 3–30 lb, WasteID, $799 at Whisker[Whisker Litter-Robot 5](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-5/)Rotating globe · 3–30 lb · up to 5 cats8.5**$$$**$PremiumPrice tier: Premium[Check price](https://www.amazon.com/dp/B0HN8C8TFM?tag=selfcleaninglitterboxguide.com-20) ### On this page 11 sections - [Litter-Robot 5 vs 4 vs EVO specs](#litter-robot-5-vs-4-vs-evo-specs) - [Weight and cat limits](#weight-and-cat-limits) - [Sensors: why the EVO is different](#sensors-why-the-evo-is-different) - [WasteID and Whisker+](#wasteid-and-whisker) - [Controls and daily use](#controls-and-daily-use) - [Reliability](#reliability) - [What about the Litter-Robot 3?](#what-about-the-litter-robot-3) - [Prices and running costs](#prices-and-running-costs) - [Which Litter-Robot to buy](#which-litter-robot-to-buy) - [Verdict](#verdict) - [FAQ](#faq) ## Before you choose - [Litter-Robot 4 vs PETKIT PuraMax 2: Is the Extra $300 Worth It?](https://selfcleaninglitterboxguide.com/posts/litter-robot-4-vs-petkit-puramax-2/) - [Litter-Robot Alternatives That Are Worth It (and Two to Skip)](https://selfcleaninglitterboxguide.com/posts/litter-robot-alternatives/) - [The Best Self-Cleaning Litter Box for Multiple Cats in 2026](https://selfcleaninglitterboxguide.com/posts/best-self-cleaning-litter-box-for-multiple-cats/) Whisker now sells three Litter-Robots, and the right one depends mostly on your cats’ size and number. The [Litter-Robot EVO](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-evo/) (about $599) suits one or two cats of 3–19 lb in a smaller space. The [Litter-Robot 4](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-4/) (about $699–749) covers up to four cats of 3–25 lb and is still the best all-rounder. The [Litter-Robot 5](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-5/) ($799 at Whisker) raises the limits to five cats and 30 lb and adds WasteID health tracking, which needs a subscription. We haven’t tested these boxes ourselves. This comparison uses Whisker’s published specs and prices, Amazon listing text, and hands-on results from WIRED and Tom’s Guide, which we name wherever they appear. Prices are typical street prices from dated sources, not live Amazon prices. Check today’s price before you buy. ## Litter-Robot 5 vs 4 vs EVO specs | | [Litter-Robot EVO](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-evo/) | [Litter-Robot 4](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-4/) | [Litter-Robot 5](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-5/) | | --- | --- | --- | --- | | Typical price | About $599 | About $699–749 | $799 at Whisker (Amazon sells a bundle) | | Cat weight (Whisker) | 3–19 lb | 3–25 lb | 3–30 lb | | Cats per unit | Up to 2 | Up to 4 | Up to 5 | | Entry | 14.85 × 14.85 in | 15.75 × 15.75 in | 15.75 × 15.75 in | | Interior height | 14.5 in | 16.5 in | 17.5 in | | Footprint | 20.6 × 24.3 in | 22 × 27 in | 22 × 27 in | | Height | 27.6 in | About 29.5 in (Amazon listing) | 29.9 in | | Unit weight | 21.5 lb | 24 lb | 28.7 lb | | Sensors | Weight sensors only | Laser curtain + weight | Multiple lasers + weight | | Health tracking | Visits and weight in the app | Visits and weight in the app | Adds WasteID (needs Whisker+) | | Litter-level sensing and LitterHopper | No (WIRED) | Yes | Not confirmed in our sources | | Controls | — | Physical buttons | Touchscreen | | Warranty | 1 year | 1-year WhiskerCare; 3-year extended plan available | 1-year WhiskerCare; the Amazon bundle includes 3 years | All three use the Whisker app and clumping clay litter, and Whisker prices their liners and carbon filters the same. See every box side by side on the [comparison chart](https://selfcleaninglitterboxguide.com/litter-boxes/). ## Weight and cat limits This is the first thing to settle. Whisker rates the EVO for up to two cats of 3–19 lb, the LR4 for up to four of 3–25 lb, and the LR5 for up to five of 3–30 lb. Which cat weights each box allows (lb) Maker ranges for automatic mode. Below the left end, the sensors may not notice your cat; hatched bars have no published minimum. Hooded globe / drum Open-top Rake / other [Leo's Loo Too 1–20](https://selfcleaninglitterboxguide.com/litter-boxes/casa-leo-leos-loo-too/)[Neakasa M1 2.2–33](https://selfcleaninglitterboxguide.com/litter-boxes/neakasa-m1/)[ScoopFree SmartSpin 2.5–25](https://selfcleaninglitterboxguide.com/litter-boxes/petsafe-scoopfree-smartspin/)[Litter-Robot 5 3–30](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-5/)[Litter-Robot 4 3–25](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-4/)[Litter-Robot EVO 3–19](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-evo/)[Purobot Ultra 3.3–22](https://selfcleaninglitterboxguide.com/litter-boxes/petkit-purobot-ultra/)[Purobot Max Pro 2 3.3–22](https://selfcleaninglitterboxguide.com/litter-boxes/petkit-purobot-max-pro-2/)[PuraMax 2 3.3–22](https://selfcleaninglitterboxguide.com/litter-boxes/petkit-puramax-2/)[Furbulous Self-Packing 3.3–22](https://selfcleaninglitterboxguide.com/litter-boxes/furbulous-self-packing/)[Lesure Open-Top 3.3–18](https://selfcleaninglitterboxguide.com/litter-boxes/lesure-open-top/)[ELS PET Orbitie ?–21](https://selfcleaninglitterboxguide.com/litter-boxes/els-pet-orbitie/)[ScoopFree Classic ?–15](https://selfcleaninglitterboxguide.com/litter-boxes/petsafe-scoopfree-crystal-classic/)[ScoopFree Crystal Smart ?–?](https://selfcleaninglitterboxguide.com/litter-boxes/petsafe-scoopfree-crystal-smart/) 05101520253035 Kittens under the minimum should use the box with automatic cleaning off. Check your own cat in the [safety checker](https://selfcleaninglitterboxguide.com/tools/cat-safety-checker/). Treat the upper limits as firm. A 20-lb cat rules out the EVO, and a cat near 25 lb is better served by the LR5’s extra headroom: 17.5 in inside against 16.5 in for the LR4 and 14.5 in for the EVO. If you’re unsure, check your cat’s weight and length in the [safety checker](https://selfcleaninglitterboxguide.com/tools/cat-safety-checker/#weight=20&model=whisker-litter-robot-evo). The minimum is the same on all three. Whisker lists 3 lb for automatic mode, and below that says to use semi-automatic mode: leave the robot powered off and cycle it yourself. Our [kitten guide](https://selfcleaninglitterboxguide.com/posts/best-self-cleaning-litter-box-for-kittens/) covers the transition. For cat counts, remember that a rating is a maximum, not a target. The AAFP’s guidance for regular boxes is one per cat plus one. WIRED notes that automatic boxes reduce the need for multiple options, but suggests keeping the old box out. Our [box calculator](https://selfcleaninglitterboxguide.com/tools/how-many-litter-boxes/#cats=4&floors=2&auto=1) helps you plan. ## Sensors: why the EVO is different The LR4 pairs a laser curtain with weight sensors, and Whisker says the LR5 uses multiple lasers plus weight sensors and anti-obstruction detection. Two kinds of sensing give the robot more than one way to notice a cat. Whisker says the EVO relies on weight sensors to detect a cat entering and leaving. Its entrance still stays open: the EVO is one of WIRED’s picks, and WIRED only recommends boxes that stay open during cycling. But a weight-only box depends on one signal, which is one more reason to respect its 3 lb minimum. Our [safety explainer](https://selfcleaninglitterboxguide.com/posts/are-self-cleaning-litter-boxes-safe/) goes into the details. ## WasteID and Whisker+ The LR5’s headline feature is WasteID, which Whisker says distinguishes urine from stool visits. It’s aimed at owners who want a closer record of their cats’ bathroom habits than visit counts and weights alone. There are two catches: - **It needs a subscription.** WasteID and cat identification need Whisker+, which WIRED puts at about $80 a year. Check Whisker for current plans. - **It took time to work.** In WIRED’s testing, WasteID and weight-based cat ID worked only intermittently for the first four months, then improved markedly after firmware updates. The Amazon listing sells the LR5 as a Protection & Insights Bundle, with a 3-year warranty and six months of Whisker+. We couldn’t capture that bundle’s price, so compare it against Whisker’s $799 robot price on the day. Whisker also sells an LR5 Pro at $999 with dual AI cameras. WIRED says it needs Whisker+ for reliable AI features. We don’t cover it separately. ## Controls and daily use WIRED found the LR5’s touchscreen finicky and preferred the LR4’s physical buttons. That’s a small thing until you’re resetting a cycle with litter on your hands. On daily use, all three are low-effort, with different strengths: - **EVO:** WIRED’s single-cat tester emptied it about once a week and found it virtually odor-free and basically silent. Its unit arrived without the liners it should include, and waste sometimes stuck to the globe’s ceiling. WIRED says it has no litter-level sensing or LitterHopper support, so you top up by hand. - **LR4:** WIRED names it its pick for automatic litter refilling with the optional LitterHopper ($129 at Whisker), and likes the app. Tom’s Guide found the app tells cats apart by weight. - **LR5:** WIRED’s tester emptied it about every 10 days with two cats, and WIRED suggests adding Whisker’s ramp and mat. ## Reliability The LR4 has the longest record of the three, and it has known wear points. After nearly two years, WIRED’s unit sometimes sensed “ghost cats” and reported a full drawer when it was half full, and the LitterHopper intermittently stopped working. Tom’s Guide’s LR4, used for more than a year, was still holding up but sometimes squeaked, so plan on regular maintenance. The EVO and LR5 are newer, so there’s less long-term data on either. The Amazon LR5 listing first appeared on October 16, 2026. Our [troubleshooting guide](https://selfcleaninglitterboxguide.com/posts/automatic-litter-box-troubleshooting/) covers the common errors. ## What about the Litter-Robot 3? Whisker’s Litter-Robot 3 Connect page now says the model is no longer available. If you see one secondhand, two specs matter: it needed cats of at least 5 lb for automatic mode, against 3 lb on current models, and its entry was 10.25 × 15.25 in. For kittens and small cats in particular, a current model is the better choice. ## Prices and running costs Whisker’s prices on November 12, 2026 were $599 for the EVO, $699 for the LR4 and $799 for the LR5. WIRED’s November 6 price box showed the LR4 at $749 on Amazon. Whisker’s site carried a holiday banner for “$150 off select Litter-Robot bundles,” so compare bundle prices with the robot-only price before you buy. Our [Black Friday guide](https://selfcleaninglitterboxguide.com/posts/self-cleaning-litter-box-black-friday-deals/) explains how to judge a deal. Running costs are nearly identical, because all three use Whisker liners (25 for $25), carbon filters (6 for $30, one filter per cat) and clumping litter at the same prices. With our default assumptions, about four liners, one filter and 10 lb of litter per cat per month, that’s about $177 a year for one cat. | Five years, box included | One cat | Two cats | | --- | --- | --- | | Litter-Robot EVO | About $1,480 | About $2,370 | | Litter-Robot 4 | About $1,580 | About $2,470 | | Litter-Robot 5 | About $1,680 | About $2,570 | | Litter-Robot 5 with Whisker+ | About $2,080 | About $2,970 | Optional OdorTrap packs are excluded. Adjust the numbers in the [cost calculator](https://selfcleaninglitterboxguide.com/tools/litter-box-cost-calculator/#cats=2&years=5). Whisker supplies on Amazon include [drawer liners](https://www.amazon.com/dp/B0F3QTK9ZT?tag=selfcleaninglitterboxguide.com-20), the [LR4 carbon filter 6-pack](https://www.amazon.com/dp/B0BMNB1C7K?tag=selfcleaninglitterboxguide.com-20) and a [cleaning supply kit](https://www.amazon.com/dp/B09ZCMDXP7?tag=selfcleaninglitterboxguide.com-20); check each listing for model fit. More on the [accessories page](https://selfcleaninglitterboxguide.com/accessories/). ## Which Litter-Robot to buy | Your situation | Buy | | --- | --- | | One or two cats under 19 lb, limited floor space | [Litter-Robot EVO](https://www.amazon.com/dp/B0G6GDC4VN?tag=selfcleaninglitterboxguide.com-20) | | Three or four cats | [Litter-Robot 4](https://www.amazon.com/dp/B0BH6MD3DJ?tag=selfcleaninglitterboxguide.com-20) | | You want automatic litter refilling | Litter-Robot 4 with the LitterHopper | | A cat between 25 and 30 lb | [Litter-Robot 5](https://www.amazon.com/dp/B0HN8C8TFM?tag=selfcleaninglitterboxguide.com-20) | | Five cats | Litter-Robot 5, and a backup box | | You want urine-vs-stool tracking and will pay for Whisker+ | Litter-Robot 5 | | A kitten under 3 lb | Any, in semi-automatic mode until it reaches 3 lb | Not set on Whisker? Our [Litter-Robot alternatives](https://selfcleaninglitterboxguide.com/posts/litter-robot-alternatives/) and [Litter-Robot 4 vs PETKIT PuraMax 2](https://selfcleaninglitterboxguide.com/posts/litter-robot-4-vs-petkit-puramax-2/) cover cheaper options, and the [litter box matcher](https://selfcleaninglitterboxguide.com/tools/litter-box-matcher/#cats=2&budget=800&app=1) sorts every box by your cats and budget. ## Verdict Buy the Litter-Robot EVO if you have one or two cats under 19 lb. It’s the cheapest Litter-Robot, takes the least space, and WIRED found it quiet and odor-free. Accept weight-only sensing and topping up litter yourself. Buy the Litter-Robot 4 if you have three or four cats, a cat up to 25 lb, or want the LitterHopper. It’s the best-supported model, with a laser curtain, physical buttons and the longest test record, wear issues included. Buy the Litter-Robot 5 only if you need its limits, five cats or a cat over 25 lb, or you specifically want WasteID and will pay for Whisker+. It’s a capable robot, but for most homes the extra money buys features WIRED found took months to settle. [Check today’s Litter-Robot 4 price](https://www.amazon.com/dp/B0BH6MD3DJ?tag=selfcleaninglitterboxguide.com-20), [EVO price](https://www.amazon.com/dp/B0G6GDC4VN?tag=selfcleaninglitterboxguide.com-20) or [Litter-Robot 5 bundle price](https://www.amazon.com/dp/B0HN8C8TFM?tag=selfcleaninglitterboxguide.com-20) before you decide. ## Don't guess. Calculate. - [🐾 Safety checker](https://selfcleaninglitterboxguide.com/tools/cat-safety-checker/): which boxes fit your cat - [💵 Cost calculator](https://selfcleaninglitterboxguide.com/tools/litter-box-cost-calculator/): 1-, 3- and 5-year totals - [🎯 Litter box matcher](https://selfcleaninglitterboxguide.com/tools/litter-box-matcher/): ranked for your home - [📊 Compare every box](https://selfcleaninglitterboxguide.com/litter-boxes/): sortable spec table ## Frequently asked questions ### Is the Litter-Robot 5 worth it over the Litter-Robot 4? Only if you need what it adds: a 30 lb limit instead of 25, a five-cat rating instead of four, 1 in more headroom, and WasteID health tracking. WasteID needs a Whisker+ subscription, about $80 a year per WIRED, and took months of firmware updates to work reliably in WIRED's testing. WIRED also preferred the LR4's physical buttons to the LR5's touchscreen. For most homes, the LR4 does the same core job for about $50–100 less. ### What's the difference between the Litter-Robot EVO and Litter-Robot 4? The EVO is smaller and cheaper: about $599, with a 20.6 × 24.3 in footprint, rated for up to two cats of 3–19 lb. The LR4 is about $699–749, with a 22 × 27 in footprint, rated for up to four cats of 3–25 lb. The EVO uses weight sensors only, while the LR4 adds a laser curtain. WIRED says the EVO has no litter-level sensing or LitterHopper support. ### Which Litter-Robot is best for a large cat? The Litter-Robot 5, rated to 30 lb with 17.5 in of interior height, or the Litter-Robot 4, rated to 25 lb with 16.5 in. Both have a 15.75 × 15.75 in entry. The EVO's 19 lb limit and 14.85 in entry make it a poor fit for big cats. ### Can kittens use a Litter-Robot? All three current models list 3 lb as the minimum for automatic mode. Below that, Whisker says to use semi-automatic mode: leave the robot powered off and start cycles yourself until the kitten reaches 3 lb. Keep a regular box available too. ### Is the Litter-Robot 3 still available? No. Whisker's Litter-Robot 3 Connect page says it is no longer available. It needed cats of at least 5 lb for automatic mode and had a 10.25 × 15.25 in entry, so the LR4 and EVO are better choices for small cats. ## Sources - [Whisker: Litter-Robot 5](https://www.litter-robot.com/litter-robot-5.html) · checked 2026-11-12 — 3–30 lb, up to 5 cats, 15.75 × 15.75 in entry, 17.5 in interior, 22 × 27 in footprint, 29.9 in tall, 28.7 lb, multiple lasers plus weight sensors, WasteID, $799; LR5 Pro $999 with dual AI cameras. - [Whisker: Litter-Robot 4](https://www.litter-robot.com/litter-robot-4.html) · checked 2026-11-12 — 3–25 lb, up to 4 cats, 15.75 × 15.75 in entry, 16.5 in interior, 22 × 27 in footprint, 24 lb, laser and weight sensors, semi-automatic mode under 3 lb, $699. - [Whisker: Litter-Robot EVO](https://www.litter-robot.com/litter-robot-evo.html) · checked 2026-11-12 — 3–19 lb, up to 2 cats, 14.85 × 14.85 in entry, 14.5 in interior, 20.6 × 24.3 in footprint, 27.6 in tall, 21.5 lb, relies on weight sensors, $599. - [Whisker: Litter-Robot 3 Connect](https://www.litter-robot.com/litter-robot-3-connect.html) · checked 2026-11-12 — Listed as no longer available; needed cats of at least 5 lb for automatic mode; 10.25 × 15.25 in entry. - [WIRED: The Best Automatic Litter Boxes](https://www.wired.com/gallery/best-automatic-cat-litter-boxes/) · checked 2026-11-12 — LR4 best with litter refilling; EVO best for small spaces (near-silent, virtually no odor); LR5 WasteID intermittent for four months then improved; WIRED preferred the LR4's buttons; Whisker+ about $80 a year. - [Whisker: Litter-Robot accessories](https://www.litter-robot.com/accessories.html) · checked 2026-11-12 — Liners 25 for $25, carbon filters 6 for $30, OdorTrap 6 for $30; LitterHopper $129; LitterTrap mat $50. - [Amazon: Litter-Robot 5 Protection & Insights Bundle](https://www.amazon.com/dp/B0HN8C8TFM?tag=selfcleaninglitterboxguide.com-20) · checked 2026-11-12 — Bundle with a 3-year warranty and 6 months of Whisker+; up to 5 cats of 3–30 lb; first available October 16, 2026. - [Amazon: Litter-Robot EVO listing](https://www.amazon.com/dp/B0G6GDC4VN?tag=selfcleaninglitterboxguide.com-20) · checked 2026-11-12 — Up to 2 cats of at least 3 lb; 24.3 × 20.6 × 27.6 in; 21.5 lb; 1-year warranty. ## Get new guides by e-mail One short e-mail when Self-Cleaning Litter Box Guide publishes a new guide. No spam, no sharing your address, and you can unsubscribe in one click. E-mail address New posts only · Unsubscribe anytime · [Privacy](https://selfcleaninglitterboxguide.com/privacy/) Our #1 pick Best for most homes with three or four cats: 3–25 lb, laser and weight sensors, about $699–749 ![Whisker Litter-Robot 4](https://selfcleaninglitterboxguide.com/_astro/whisker-litter-robot-4.CZhanV3w_VBSjy.webp) ### [Whisker Litter-Robot 4](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-4/) 8.7 - Rotating globe - 3–25 lb - Up to 4 cats - Entry stays open Multi-cat homes (up to four cats) and big cats that want the best-supported, most-copied design on the market. $$$$ Premium Price tier: Premium typical street price; check Amazon for today's [Check price on Amazon](https://www.amazon.com/dp/B0BH6MD3DJ?tag=selfcleaninglitterboxguide.com-20)[Read the full review](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-4/) [🐾 Safe for your cat? Check weight limits, kitten rules and cats per box in 20 seconds.](https://selfcleaninglitterboxguide.com/tools/cat-safety-checker/)[💵 What will it really cost? Liners, trays and litter over five years, model by model.](https://selfcleaninglitterboxguide.com/tools/litter-box-cost-calculator/) ## Keep reading [Head-to-head ### Litter-Robot 4 vs PETKIT PuraMax 2: Is the Extra $300 Worth It? Litter-Robot 4 vs PETKIT PuraMax 2: weight limits, entry size, sensors, litter, app and five-year running costs, plus who should buy which and a middle pick. Updated Nov 12, 2026](https://selfcleaninglitterboxguide.com/posts/litter-robot-4-vs-petkit-puramax-2/)[Alternatives ### Litter-Robot Alternatives That Are Worth It (and Two to Skip) The Litter-Robot alternatives worth buying in 2026: PETKIT PuraMax 2 and Max Pro 2, Neakasa M1, Lesure and ScoopFree, plus two designs we'd skip, and why. Updated Nov 12, 2026](https://selfcleaninglitterboxguide.com/posts/litter-robot-alternatives/)[Multi-cat ### The Best Self-Cleaning Litter Box for Multiple Cats in 2026 The best self-cleaning litter boxes for two to five cats: maker cat limits, real drawer capacity, weight-based cat ID, and why the n+1 box rule still applies. Updated Nov 12, 2026](https://selfcleaninglitterboxguide.com/posts/best-self-cleaning-litter-box-for-multiple-cats/) Best for most homes with three or four cats: 3–25 lb, laser and weight sensors, about $699–749 Litter-Robot 4 $$$$ Premium Price tier: Premium [Check price](https://www.amazon.com/dp/B0BH6MD3DJ?tag=selfcleaninglitterboxguide.com-20)