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The verdict. On price alone the Ecovacs GOAT O1000 RTK at $999.99 is the cheapest capacity here, at $4,000 an acre. On the full ledger it finishes last at 38.3 of 100, behind the Segway Navimow i210 AWD at 51.0, the Mammotion LUBA mini 2 AWD at 48.8 and the eufy Robot Lawn Mower E15 at 46.8. The reason is a twelve-month warranty that names batteries as an excluded consumable, and a documented critical vulnerability on Ecovacs’ own previous mower generation. The cheapest acre on this page is not the cheapest mower to own.

Updated August 31, 2026.

Published July 16, 2026 · Updated August 31, 2026 · By Nate Colburn

What Does a Robot Lawn Mower Cost per Acre?

Every one of these machines is sold on a coverage number. Divide the maker’s own price by the maker’s own acreage and the spread is wider than the sticker prices suggest.

The arithmetic, shown: $999.99 ÷ 0.25 = $3,999.96. $1,149.00 ÷ 0.25 = $4,596.00. $1,799.00 ÷ 0.37 = $4,862.16. $1,799.99 ÷ 0.2 = $8,999.95, and $1,299.99 ÷ 0.2 = $6,499.95.

Two things fall out before you reach any spec. eufy is the most expensive capacity here at either of its own prices, between 1.6 and 2.25 times the Ecovacs. And eufy publishes two prices for one machine on its own website on the same day. The product page and the E-series landing page both say $1,799.99. The lawn mower collection page says $1,299.99 with $500.00 marked as saved.

Prices are approximate, current as of publication, and change frequently — confirm the latest price with the retailer before buying.

Is a Robot Lawn Mower’s Acreage Claim Reliable?

Now the part that makes the table above less decisive than it looks, and I would rather undercut my own number than let you use it wrong.

Segway attaches this footnote to its mower pages: “Supports map storage up to 1.2× the recommended mowing area (e.g. up to 1.2 acres for a 1-acre model). Actual mappable area may vary depending on yard layout and complexity.” The advertised acreage is a map budget, not a lawn. It is shared across every zone you draw, so a front, a back and a side strip all draw from the same pool.

Segway publishes the upward band on several models in the same breath: the X450 “may support a maximum mowing area of up to 1.8 acres” against a 1.5-acre headline, the H220 up to 0.6 against 0.5, the i215 up to 0.44 against 0.37, and the i206 up to 0.18 against 0.15. That is a consistent 20 percent of headroom, stated by the maker.

Apply it to the i210. At 0.25 acre the machine works out at $4,596 an acre; at the 0.30 acre its own footnote allows, $1,149.00 ÷ 0.30 = $3,830.00. Segway’s own published band runs $3,830 to $4,596. That band contains the Ecovacs figure of $4,000 outright and comes within $266 of the Mammotion.

So the honest reading of the first table is this. Two of these four mowers sit inside one maker’s own stated uncertainty, and the Mammotion sits $266 outside it. The ordering among those three is not a real ordering. Only eufy is far enough out to be a genuine result. And the downside is worse than the upside, because Segway publishes a ceiling and no floor — “actual mappable area may vary” with complexity, and it does not say by how much.

What Slope Can a Robot Lawn Mower Handle?

The slope rating is the second number people buy on, and on two of these brands it comes in a pair.

Why Does the Boundary Slope Figure Matter?

The boundary figure is the one that decides whether a machine works on your property. A mower that climbs a 30 percent grade mid-lawn but holds a virtual boundary only at 10 percent will not finish a sloped yard. On most sloped yards the slope runs to the edge. Segway prints 30 and 10 for the i110. Ecovacs prints 45 and 17 for the O1000 LiDAR PRO. Both sit on the maker’s own page, and the small one never makes the headline.

I could not find a published boundary figure for the Mammotion, the eufy, or the Segway i210 AWD. That may mean they do not have the limitation. It may mean they do not print it. Read the second number carefully on any model that has one, and ask about it on any model that does not.

Segway’s test setup is worth reading twice as well. Its 45 percent was measured on grass just under two inches, dry, with no obstacles on the slope. Wet grass on a hill with a tree root in it is not that test.

Is a Robot Lawn Mower Safe Around Children?

This is the most important section on the page and it does not resolve.

Consumer Reports published its robotic mower testing on July 14, 2026, covering six machines: the Segway Navimow i105N and X315, the Mammotion Luba 2 AWD 3000X and Luba Mini AWD 800, the eufy E18 and the Ecovacs Goat O1000 RTK. CR states that “We assess whether the robotic mower stops when a person gets close to it and whether its blades stop automatically if someone attempts to lift it,” and reports top marks for safety among the models it recommends.

What Did Stiftung Warentest Find?

Stiftung Warentest published its own test on March 23, 2026, covering 14 mowers including Anker Eufy, Ecovacs and Mammotion. Its protocol goes further: alongside adult and child foot dummies, testers used a wooden replica of a crawling child’s arm, 4 cm across and 55 cm long, and hedgehog dummies. On whether the machines detect the foot replicas in time, Warentest’s own free preview says, in German, that many do not.

Two of the most credible consumer testing organizations in the world tested the same category in the same year. They do not agree on whether these machines detect a child. I am not going to pretend one of them is right. The protocols differ, the model samples differ, and Warentest’s full results sit behind a €4.90 paywall. A German outlet summarising the paywalled issue reports that ten of fourteen machines drove over the wooden arm; I could not verify that count at test.de itself, so treat it as secondary reporting rather than as Warentest’s published figure.

Is Any US Safety Rule Mandatory for These Machines?

What is not in dispute: no US safety certification is required. The CPSC lists ANSI/OPEI 60335-2-107-2020, “Particular Requirements for Robotic Battery Powered Electrical Lawnmowers,” under voluntary standards. And the one mandatory federal mower rule does not reach these machines at all: 16 CFR Part 1205 covers “A grass cutting machine either pushed or self-propelled… normally controlled by an operator walking behind the mower,” and requires the blade to “come to a complete stop within 3.0 seconds after release of the control.” A robot mower has no operator walking behind it and no control to release. The three-second figure you see quoted for robot mowers comes from a rule that does not apply to them.

None of the four publishes a certification number against the voluntary standard on its US product pages. Every one of them necessarily holds an FCC equipment authorization for its radios, and those are publicly searchable. The transmitter is regulated and the blade is not. Run yours when the yard is empty and follow the manufacturer’s own guidance on children and pets, whichever machine you buy.

How Does Each Robot Lawn Mower Score on Five Axes?

Weights are mine and the reasoning is beside each one. The first axis scores how much independent testing exists on the exact model you would buy, not how safe the machine is; the published evidence does not support scoring the second thing.

How Do Running Costs and Vulnerability Records Score?

Ecovacs’ arithmetic, since it is the surprising one: 0.30 × 65 = 19.5, plus 0.20 × 20 = 4.0, plus 0.25 × 35 = 8.75, plus 0.15 × 30 = 4.5, plus 0.10 × 15 = 1.5. Total 38.25, rounded to 38.3.

Why Does the Best-Tested Mower Finish Last?

That is the named loser, and it is the best-tested machine on the page. It still finishes last, because a twelve-month warranty excluding the battery on a $1,000 machine is a short leash, and because CVE-2024-52325, scored 9.6 critical, records that “ECOVACS robot lawnmowers and vacuums are vulnerable to command injection via SetNetPin() over an unauthenticated BLE connection.” That CVE names the GOAT G1 family and the GX-600, not the O1000 you would buy today, and Ecovacs issued advisories. It is the vendor’s record, not this model’s defect, and I scored it that way.

Disagree with 15 percent on vulnerability history and drop it to 5, moving the difference to independent testing, and Ecovacs rises to 41.8 while eufy slips to 46.3. The gap closes from 8.5 points to 4.5, and Ecovacs still finishes last. The axes are printed so you can do exactly that.

How Often Do Robot Lawn Mower Blades Need Replacing?

Four makers, four different units for one consumable.

Segway sells a 12-piece Blade Assembly Plus for $23.99 and says “Typically the blades should be replaced after 80 hours of use.” eufy sells blades and screws for $11.99 and says to “replace all three blades and screws at the same time” after 240 hours. Ecovacs sells a 12-blade kit for $29.99 and gives the interval as “About 4-6 weeks.” Mammotion sells Endurance Replacement Blades for $49.00 and publishes no interval I could find.

Eighty hours against 240 is a threefold difference in stated blade life between two makers of the same kind of machine, and Ecovacs’ figure is a calendar window that will not convert without knowing your run time. None of the four publishes how many blades one change consumes out of the pack it sells you, so a cost per mowing hour is not computable for any of them. I am not going to invent the missing number to make a tidier table.

What Do Robot Lawn Mower Subscriptions Cost?

The connectivity bill is where the real money is, and Segway is the one to watch. Its i105 page footnotes that “Anti-theft requires separate purchase of Navimow Access+ 4G module,” listed at $95.99 on sale against $119.99 regular. Segway also rents mowers outright: Navimow Flex charges $100 a month for the i105 tier covering an eighth of an acre. Twelve months of that is $1,200, against Segway’s own $669 sale price for the same i105. The subscription costs 1.79 times the machine in the first year. Mammotion goes the other way and states that its iNavi service and 4G data are “free for the entire lifecycle of the product” — though its own product pages say 3 years, and I am printing both because Mammotion does.

Positioning has a physical prerequisite too. NOAA’s National Geodetic Survey lists sites unsuitable for a real-time GNSS base station as including “locations under or very near tree canopy.” Segway’s own support article asks for at least 110 degrees of unobstructed sky and no obstacles within two metres. If your lawn is under trees, a government agency and the manufacturer are telling you the same thing.

Which Yard Is Each Robot Lawn Mower Wrong For?

Segway Navimow i210 AWD, $1,149. Wins this ledger on disclosure rather than on hardware: Segway publishes battery prices for six separate SKUs down to the cent, an 80-hour blade interval, and the fine print on its own coverage claim. It also charges roughly $96 to $120 extra for the 4G module that makes anti-theft work on the entry models. Skip this if your lawn is under mature trees, because the whole platform leans on satellite positioning that NOAA says canopy degrades.

Mammotion LUBA mini 2 AWD, $1,799. The best warranty here at three years including the battery, all-wheel drive rated to an 80 percent grade, and free connectivity for as long as the machine lives — or three years, depending which Mammotion page you open. Note also a pricing inversion on Mammotion’s own store: the LUBA 3 AWD 1500 covering 0.37 acre lists at $2,399 while the LUBA 3 AWD 3000 covering 0.75 acre lists at $2,239. More mower, less money, same page. Skip this if your lawn is flat and rectangular, because the AWD premium buys you nothing there.

Who Should Skip the eufy and Ecovacs Mowers?

eufy Robot Lawn Mower E15, $1,299.99 or $1,799.99. Camera navigation with no RTK antenna and nothing to mount, and a warranty table that covers the mower, the base station, the adapter and the battery pack for two years apiece. Then it charges between 1.6 and 2.25 times the Ecovacs per acre and states in its own footnote that objects under 5 cm tall and smaller than 10 by 10 cm “need to be cleared or marked as No-Go Zone.” Skip this if your yard has a dog toy problem, or if you want the maker to agree with itself about the price.

Ecovacs GOAT O1000 RTK, $999.99. The cheapest acre on the page, the only model here that Consumer Reports has tested by exact SKU, and a published 0.8-inch positioning precision figure that Segway does not match with any numeral of its own. Twelve months of warranty, batteries excluded. Skip this if you expect to still be mowing with it in year three, because at that point you own every component in it outright.

A note on recalls: a search of CPSC’s published recalls found none for Segway, Anker or eufy, Ecovacs or Mammotion robot mowers. The Segway recalls that surface are personal transporters, UTVs and a kick scooter, none of them a mower.

Settling a 2.2-Point Gap Between Segway and Mammotion

Segway 51.0, Mammotion 48.8. Two points on a hundred-point scale is not a verdict, so here is the tie-breaker.

My own money goes to the Mammotion, and it costs me the top of my own ledger to say so. Segway wins on paperwork. Mammotion wins on the two things that are hardest to buy back later: three years of warranty that includes the battery, and connectivity that does not carry a meter. Segway’s answer to anti-theft is a $96 module and its answer to convenience is $100 a month, and both of those are decisions the company can revisit after you have bought the mower. A warranty is not.

Move running-cost disclosure from 25 percent down to 15 and put the difference on warranty, and Mammotion takes the ledger outright at 51.8 against Segway’s 49.5. That is how close this is.

We have gone at the rest of the automated backyard the same way: robotic pool cleaners, what a $1,200 robot vacuum does that a $200 one cannot, and grill formats for when the mowing is finished. The rest lives in beach and backyard.

If you own one of these four and your yard has a slope at the boundary, tell me what it actually managed. That is the number none of these companies will print.

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Published July 15, 2026. Prices and specs checked September 2, 2026.

Prices are approximate, current as of publication, and change frequently — confirm the latest price with the retailer before buying.

Best for most pools: the Maytronics Dolphin Cayman is the robotic pool cleaner to buy, at $1,129.00 direct from Maytronics’s own store. That works out to $564.50 for every year of its 2-year warranty, the cheapest of the four here. It runs floor and walls on a built-in weekly timer with no battery to manage. Skip the cord only if your pool deck has nowhere safe to plug one in. That’s the one problem the Polaris Freedom and Beatbot AquaSense 2 Ultra solve that a Dolphin doesn’t.

The Beatbot is the one to skip outright right now. At $2,299.00 on sale ($3,150.00 at list), it’s the most expensive robot in this comparison and the worst-reviewed. The Pool Nerd’s independent review calls it “Pool Nerd Disapproved.” It also reports weak suction that gets weaker as the battery drains. Its own coverage spec isn’t even measured the same way as the other three, which is its own finding below.

I’ve spent years around backyard pools, and the cleaner that gets used is the one that doesn’t need carrying anywhere. Anything that has to be lifted out, charged and put back becomes a chore by the second week.

What Does a Robotic Pool Cleaner Cost per Year of Warranty?

A pool robot’s warranty is the maker’s own bet on how long it lasts. Divide today’s price by that bet and you get a real number: what a single covered year actually costs. Every price below is what each maker (or, for Polaris, an authorized retailer) charges today, pulled September 2, 2026, not carried over from an old listing.

The Cayman wins this even before you get to pool size. It has the cheapest sticker, and its 2-year warranty still gives it the cheapest year-by-year math of the group. The Premier costs $833.00 a covered year, the most of any Dolphin. It also carries a full extra year of coverage the Cayman doesn’t offer, on a bigger pool.

How Long a Pool Does Each Robotic Pool Cleaner Cover?

Rated pool length is the second real number, and it’s where the four stop being comparable on one column. Maytronics’s own Cayman page and an authorized Dolphin dealer’s listing don’t agree with each other on the Cayman. That disagreement gets its own section below. Here’s what each currently states, plus what that works out to per foot.

The Freedom posts the cheapest cost per foot of the four, even though it isn’t the cheapest cost per covered year. Both it and the Cayman carry 2-year warranties, so the Cayman’s lower price gives it the lower per-year number. Neither number is “the” answer. A buyer sizing a large pool on a budget should weight the per-foot column harder. A buyer who just wants the cheapest total commitment should weight cost per year harder. Both are real math from the same two prices.

Why Is the Beatbot Rated by Area, Not Length?

Beatbot doesn’t publish a maximum pool length for the AquaSense 2 Ultra at all. Its own product page rates the robot by area instead: a recommended pool floor of 3,875 square feet, and up to 3,444 square feet in a single cleaning cycle. That isn’t the same kind of measurement as a linear foot rating, and it doesn’t convert into one without guessing. Rather than force a number that isn’t there, the Beatbot sits out of the per-foot column above. That gap is worth knowing on its own. Every other maker in this comparison tells you how long a pool the robot is built for, and Beatbot doesn’t.

Which Robotic Pool Cleaner Spec Is Real: Maker or Dealer?

Two sources say 40 feet. One says 33. Here’s what’s printed where, plus two more places a maker’s page and an independent reviewer land on different footing.

Does a Cordless Robotic Pool Cleaner Mean Less Work?

The pitch for both cordless robots here is that you stop thinking about pool cleaning entirely. Neither one’s own numbers back that up. Polaris’s own Freedom page states a single run takes “2.5 hours or less” and a full recharge takes “less than 5 hours.” So between cleanings, someone is pulling the robot out and putting it on a charger. Beatbot’s numbers run the same way: 4.5 to 10 hours of runtime depending on mode, against a 4.5-hour recharge, per Beatbot’s own spec sheet. A corded Dolphin, by contrast, sits on a built-in weekly timer and runs itself. Nobody retrieves it between cycles unless they’re taking it out for a swim day.

There’s a real safety reason to take that extra handling seriously, too. The CPSC has recalled two different cordless robotic pool cleaners from Aiper over the past few years: the Elite Pro in 2023 and the Seagull Pro in 2025. Both recalls were over charging setups that could overheat and cause burns or fire. Neither Aiper model appears in this comparison, and none of the four robots here carry an open recall as of this writing. Still, it’s the reason to buy an established brand, register the product, and follow the maker’s charging instructions exactly with any battery device that lives near water.

How Does Each Robotic Pool Cleaner Score?

Four axes, weighted by what determines whether a pool robot does its job: cleaning power and coverage, cost per covered year (from the table above), what owners and independent reviewers report, and how much hands-on work it demands between cycles. These are our own weighted scores, built from the sourced facts in this piece. They are not a lab result, and not anyone else’s rating system.

Coverage is the axis where the Premier beats the Cayman by the widest margin: 4,500 GPH and full floor-wall-waterline cleaning, against the Cayman’s 4,000-plus GPH and floor-and-walls-only. It’s also the reason The Pool Nerd’s reviewer, who has reviewed more than 30 robotic cleaners for that site, names the Premier a personal favorite. The Cayman closes almost the entire gap on price and convenience instead. The Freedom’s biggest score loss is convenience, not cleaning. Its 784 Birdeye reviewers rate it 4.0 out of 5, but every one of those reviews happened around a retrieve-and-recharge routine the corded models don’t require. The Beatbot loses on every axis at once, which is a different problem than losing on one.

Who Should Buy the Dolphin Cayman?

The Cayman is dual-motor, wall-climbing, and rated for over 4,000 gallons an hour of flow, per Maytronics’s own spec sheet. That’s enough to clean the floor and walls of a pool up to 40 feet on its own timer. The Pool Nerd’s independent review backs the reliability case specifically. It reports “zero downtime between cleaning sessions” and no measurable loss of power over time, the kind of claim a battery robot structurally can’t make. The one drawback either source names is minor: the power cord lacks the anti-tangle swivel found on pricier Dolphins.

Buy it if your pool is 40 feet or under and you want the cheapest real ownership math here. Skip it if you’re under trees, because it doesn’t clean the waterline and it has no leaf bag for heavy debris. That’s the Premier’s job.

Who Should Buy the Dolphin Premier?

The Premier is Maytronics’s flagship for a reason: 4,500 GPH of flow, dual scrubbing brushes, full floor-wall-waterline coverage, and a multi-media filtration system built around an oversized leaf bag that the Cayman doesn’t have. It’s rated for pools up to 50 feet and backed by a 3-year warranty, tied with the Beatbot for the longest of the four here. The Pool Nerd’s reviewer calls it a personal favorite and reports a specific unit “running strong for over three years without a single hiccup.” That’s a first-hand claim from that reviewer, not from us, so read it as one data point rather than a guarantee.

Buy it if your pool sits under trees, tops 40 feet, or both. The leaf bag and waterline cleaning genuinely earn the extra cost there. Skip it if your pool is small and mostly clear of debris, since you’re paying $833.00 a covered year for capability the Cayman’s $564.50 already covers.

Who Should Buy the Polaris Freedom?

Polaris has built pool equipment for decades, and the Freedom is the sober cordless choice on that reputation alone. An established dealer network matters if something needs warranty service in year two. Birdeye’s 784 verified reviews average 4.0 out of 5, with reviewers specifically praising waterline cleaning and how it handles fine particles. The catch sits in the fine print of those same reviews. The standard filter isn’t the ultra-fine one, and at least one reviewer paid roughly $100 more to add it for sand. A single reviewer also reported it doesn’t always stop reliably at the deep end.

Buy it if your pool deck genuinely has no safe outlet and you’ve priced in the ultra-fine filter as a real add-on cost. Skip it if you have an outlet. A corded Dolphin outperforms it on this Ledger at a lower cost per covered year, with none of the retrieve-and-recharge routine.

Who Should Buy the Beatbot AquaSense 2 Ultra?

The AquaSense 2 Ultra is the only robot here that skims the surface as well as cleaning the floor, walls and waterline, with AI-driven mapping across 27 sensors, per Beatbot’s own spec sheet. On paper, that’s the most capable machine in this group. The Pool Nerd’s independent review says the paper doesn’t hold up in the water. It reports weak suction that gets noticeably weaker as the 13,400 mAh battery drains, debris missed in corners, and a unit that’s genuinely heavy to lift out for its daily recharge: 29.1 pounds, per Beatbot’s own spec sheet. The same review flags an F rating on Fakespot for the product’s own retail reviews. That’s a signal to discount Beatbot’s star rating on its own listings rather than take it at face value.

Buy it if the surface-skimming feature specifically matters to you, since floating leaves and pollen are a real nuisance a corded Dolphin can’t touch. You’ll need to be prepared to pay $766.33 a covered year, even at the current sale price, for that one capability. Skip it for straightforward floor-and-wall cleaning. Three other robots here do that job better and more reliably on both our numbers and an independent reviewer’s, and two of them, the Cayman and the Freedom, cost less.

Which Robotic Pool Cleaner Should You Buy?

Buy the Dolphin Cayman unless a specific reason points you elsewhere. It’s the cheapest robot here per covered year, the independent review backs its reliability claim specifically, and a built-in timer means you never touch it once it’s set. Go to the Premier only if your pool is over 40 feet or sits under real tree cover. The leaf bag and extra flow are worth the jump from $564.50 to $833.00 a year. Take the Freedom only if a cord genuinely can’t reach your pool, and budget for the ultra-fine filter separately. Leave the AquaSense 2 Ultra to buyers who want surface skimming specifically and have already accepted the price and the weaker independent review that come with it.

Two more stops on the backyard: our above-ground pool comparison covers what’s left to buy after a 2025 recall pulled two popular models. Our quiet window AC shortlist handles the heat once you’re out of the water. And our portable grill comparison covers the rest of a pool day.