Roomba vs Roborock vs Shark — Robot Vacuums Compared

iRobot invented the domestic robot vacuum and has kept the position through brand trust rather than specification leadership. The Roomba listings in our pool reflect that: a $49.99 used 690 described as a popular household choice, an $85 used 670, a $90 used i3 with Wi-Fi, and a $199.99 new 692 described as bagless with three-stage filtration and Alexa and Google Home support. These are competent machines with modest specifications, sold on the strength of the name, the shape of the app people already have on their phone, and a spare-parts market that is enormous. The trade-off is that you are frequently paying for the badge.

Shark is a vacuum company that added robots rather than a robotics company that added vacuums, and it shows in the product. The Shark listings lean hard on bagless self-emptying, HEPA filtration, pet hair and edge cleaning, and they cluster at higher price points than the base models: a $127.50 RV100S IQ with a self-empty base, a $172.09 PowerDetect with LiDAR, a $200 AI self-empty XL with a claimed 90-minute runtime. Shark also sells the cheapest robots on this page. The brand occupies both ends of the market, which is unusual and useful when you are shopping on a budget.

Roborock is the specification-led brand, and the listings prove it. A used Roborock E4 with a stated 200-minute runtime sits at $59. A used Q7 Max with 180 minutes and washable filters is $120. A Q7 Max self-emptying unit at $229.99 is described as 4,200Pa of suction with three hours of use on a like-new body. Even at the bottom, a $49.99 S4 carries LiDAR navigation. Roborock is where the hardware-per-dollar argument is won, and it is also the brand with the most confusing used marketplace, because docks, mops and filters are often listed separately.

One practical consequence of that history: Shark and Roborock are engineering-first companies with bagless or modular ecosystems, and iRobot is a brand-first company with an enormous installed base. That is why the cheapest machine on this page and the one with the most claimed filtration are both Shark, and why the deepest specification are both Roborock, and why neither of those is the Roomba.

More than suction, more than battery, more than brand, navigation is what separates a robot that cleans your house from a robot that repeatedly bumps into the same chair leg. There are three tiers in these listings, and they map cleanly onto the price bands.

Tier one: bump navigation, no mapping

The oldest machines in the pool navigate by contact, and they are represented at the bottom of this article. The $34.38 used is described by the seller as good used condition, working well, with normal signs of wear, sold as is. The $34.99 new is the same idea bought new. Neither listing makes any claim about mapping, room division or app-based control, and that absence is informative in itself. These machines clean an open room adequately, get confused by clutter, and have no idea they have cleaned the same spot four times.

For a small flat with hard floors and tidy furniture, that is genuinely fine, and the price gap to anything better is large. For a house with pets, a rug in the middle of the floor, or more than one room, the time you spend repositioning and re-running the machine eats the saving within a month. Contact navigation is not a bad product choice; it is a small-home product choice, and buying one for a large home is the most common expensive mistake in this category.

Tier two: visual mapping and app control

The middle tier adds a camera or optical sensor to build a rough map, and typically adds an app. The $90 used sits here, described as a sleek and efficient robot with Wi-Fi connectivity for monitoring and control and an included charging dock. It is the most capable iRobot machine in our pool and it maps, but it does not claim the row-by-row systematic coverage that the machines below do.

The $94.99 used also sits in this tier and goes further, with intelligent home mapping, AI navigation, simultaneous vacuuming and mopping, and sonic mopping. The $139.99 new is the clearest statement of it, described as new and unused and built around SmartPath row-by-row cleaning. That is a meaningful difference from random pattern cleaning, because a robot that cleans in rows returns to the same place at the end of a pass, which is how coverage becomes predictable.

Tier three: LiDAR, and where the money goes

This is the tier that separates the brands, and it is where Roborock leads decisively. The $49.99 is the standout value in this entire article, and the seller is refreshingly blunt about its condition: used-acceptable, significant scratching and cosmetic marks, fully functional and reset, with all consumable parts and brushes new. At that price, LiDAR mapping is the single best hardware-per-dollar finding in this comparison, and it is worth saying plainly that a scratched $49.99 Roborock navigates better than a clean $199.99 Roomba.

Above it, the $169.99 is an open-box unit described with 30% better carpet cleaning in UltraClean mode, which is a useful, specific claim rather than a vague one. The $172.09 combines LiDAR with a base, and the $172.50 new uses a tri-brush system described as great for picking up large and small debris. One caveat applies across all LiDAR machines: they need a low, clear space to sit while they map, and a cluttered room can produce a poor first map that the robot then follows faithfully.

The honest read of this table: Shark and Roborock both beat iRobot on navigation at every price point, and iRobot competes on ecosystem and resale. If you have never mapped a floor with a robot, the jump from contact navigation to LiDAR is the most noticeable upgrade in the category — it is the difference between running it daily and running it when you feel like it.

All three brands now mop, and this is where their differences get interesting rather than obvious. Mopping ranges from genuinely useful to decorative, and the honest differentiator is not whether a robot mops but whether it avoids your carpets while doing it and whether the dock washes the pad afterwards.

Shark: the most explicit mopping claims

Shark is the most specific about simultaneous vacuuming and mopping. The $94.99 AV2001WD above is described as a 2-in-1 that vacuums and mops at the same time while avoiding carpets. The related $159.99 RV2001WD listing states the same 2-in-1 arrangement, adds that it is good for hardwood, tile and carpet, and specifies sonic mopping at 100 scrubs per minute with a soft washable microfibre pad. That is a checkable claim rather than a vague one, and specifying the pad material and the scrub rate is exactly the level of detail a buyer should want and rarely gets.

Roborock: the better mopping ecosystem

Roborock's advantage is the system rather than the mop. The $120 used is described with up to 180 minutes of runtime and washable filters, and the $50 used is described with a 350ml dustbin and a 200ml water tank, which are the numbers that actually matter for mopping coverage. The $60 is described as bagless with high-efficiency filters and up to 150 minutes of runtime. Note the recurring pattern: Roborock used listings frequently say robot only or no charger, so budget for a replacement charger and check what the base is worth separately.

iRobot: the plainest position

iRobot's contribution in this pool is the plainest. The $199.99 new is described as bagless with three-stage filtration and voice assistant compatibility, with no mopping claim at all. That is a defensible product position rather than an omission. A vacuum that vacuums well and does not half-heartedly smear water around your hard floors is a legitimate thing to want, and if your floors are carpet, mopping capability is a feature you will never use.

Docks and self-emptying: the feature that changes daily life

Self-emptying is the feature that most changes daily use, and it is now a Shark and Roborock feature long before it is an affordable iRobot one. The $127.50 is described as clean and working perfectly, rarely used, with a 90-minute runtime. The $55.99 is used, tested and working, and gently used, which is a remarkable price for a self-emptying Shark. The $103.22 used sits in the same family and comes with a 30-day money back guarantee, which is worth noting when buying any used machine.

On the Roborock side, the $229.99 is described as robot only, like new, with three hours of use and 4,200Pa of suction, and the $249.99 is a new dock-station listing at 180-minute runtime. Just be careful with these: several Roborock self-empty listings here explicitly say robot only, so the expensive part may be missing, and a robot without its base is not a self-emptying robot. A self-emptying base that empties into a bag needs replacing; one that empties into a canister does not, which is a real long-term cost difference and Shark leans toward the canister.

Retail prices are close to meaningless for this decision, because every one of these machines is available used, new-in-box, or open-box at a fraction of list. What matters is the live used and new spread on eBay, which is what we priced.

Roomba occupies the narrowest and highest band. The used cluster runs from $49.99 for the 690 to $90 for the i3, with the 670 at $85 in between, and the only new machine in our pool is the $199.99 692. That is a steep used-to-new jump, and it means the Roomba decision is mostly a decision about how much you trust an old machine with a tired battery.

Shark has the widest spread and the lowest floor. Used and new listings run from $34.38 and $34.99 at the bottom through $55.99 and $99.99 for self-emptying units, to $127.50 for the RV100S, $139.99 for the Navigator, $169.99 and $172.09 for the LIDAR models, and $200 for the AI self-empty XL. A brand-new Shark ION at $34.99 is genuinely remarkable value, and the presence of both a $34 entry and a $200 ceiling in one brand is unusual.

Roborock runs from $49.99 used to $359.99, and the used side is where its value is most obvious. The $49.99 S4 with LiDAR, the $59 used with a stated 200-minute runtime, the $69 used described as cordless and bagless and compatible with the Mi Home system, the $70 used described as working perfectly but with no remote and no charger, and the $120 Q7 Max. On the new side, a $160 unopened and a $188.50 with 180 minutes, Wi-Fi and Alexa. The $184.99 is described as brand new and unopened with a bagless design, HEPA filters, up to 200 minutes of runtime and a four-hour charge — a strong spec sheet at a price that undercuts a new Roomba.

Read the table and the practical conclusions are immediate. Under $40, Shark or nothing. Between $40 and $100, Roborock gives you the best hardware and Shark gives you the features, while iRobot gives you the brand. Between $100 and $180, Roborock and Shark are the only brands with meaningful choice and iRobot has a gap. Above $180, all three are present and the decision stops being about price.

There is a second price question that dominates used robot buying: what is missing. Several listings here are honest about it, and those are the ones to read twice. The $229.99 Roborock Q7 Max self-emptying is robot only. The $70 Roborock E5 has no remote and no charger. The $172.09 Shark PowerDetect has been tested and works properly as a vacuum cleaner only. The $86.39 Xiaowa Roborock E25 robot vacuum is described as powering on with no further testing. A missing dock is a $60 to $120 problem and a missing charger is a $20 problem, and both silently double the price of a cheap robot.

iRobot Roomba

Pros: the most familiar name, the largest spare-parts market, straightforward resale, and a software ecosystem people already have installed. The $199.99 new 692 is a genuinely good value machine with three-stage filtration and voice assistant support, and the $49.99 used is the cheapest way into a brand that a buyer can resell without explaining what it is.

Cons: the weakest navigation in this comparison at every price, a used-to-new price jump that punishes you for shopping used, and the least mopping capability of the three in our pool. If you buy a Roomba, buy the i3 at $90 for Wi-Fi rather than the 690 at $49.99, because the app is worth more than the $40 you saved, and buy the $85 used if you need something in between.

Roborock

Pros: the best hardware per dollar, LiDAR mapping available at $49.99, the longest claimed runtimes in the article at 180 to 200 minutes, washable filters, and the most advanced mopping ecosystem. The $359.99 with 5,500Pa suction and DuoRoller all-rubber brushes is the most capable machine listed anywhere in this comparison, and it is described as used once for 83 minutes, which is as close to new as used gets. The $299 is described as new with 2,700Pa of power and 180 minutes of runtime, and the $184.99 unopened E4 is the best of the budget new stock.

Cons: the used marketplace is fragmented, with docks, filters and mops often sold separately; several listings state robot only or no charger; and the model numbering is genuinely confusing, so a new buyer can spend an hour working out that a Q5 and a Q7 Max are not adjacent products. The $86.39 Xiaowa E25 at that price is a reminder to read the condition line carefully, since it is described only as powering on with no further testing.

Shark

Pros: the cheapest robots in the article, the most explicit mopping claims, bagless self-emptying, the strongest pet-hair positioning, and the widest price spread, so there is always an option at your budget. The $55.99 self-emptying IQ and the $200 with a stated HEPA filter, 90-minute runtime, Wi-Fi and Alexa bracket the brand nicely. The $139.99 Shark Navigator robot vacuum 2110 is another option, described as used once and in excellent condition.

Cons: the top of the range is expensive without a clear specification advantage over Roborock; the self-emptying range is where you must read carefully, because vacuum-only units are listed as full machines, as with the PowerDetect; and a bagless base still needs emptying, it just empties itself into a canister. The $99.99 used Shark IQ R100AE robot vacuum shows the mid-range trade-off, where the listing sells pet hair removal, rotating brushes and edge cleaning but nothing about mapping.

Here is the short version, with every price confirmed on September 29, 2026.

• Buy Shark if you want the most robot for the least money, if you have pets and want a brand that says so out loud, or if you want a genuinely self-emptying machine under $130. The $34.99 new ION is the cheapest sensible robot in this comparison and the $55.99 self-emptying IQ is the bargain of the page.
• Buy Roborock if you care about navigation above everything else, if you want to mops properly, or if you are comfortable learning the model numbers. The $49.99 S4 with LiDAR is the single best-value machine here, and the $120 Q7 Max is the best all-rounder in the $100 range.
• Buy Roomba if you want the brand, the resale value, and the parts market, and you are not trying to get the most cleaning per dollar. The $90 i3 is the one to buy rather than the $49.99 690.
• Best overall value in this comparison: the used Roborock S4 at $49.99, accepting its scratched cosmetic condition, because LiDAR mapping at that price changes how often you will actually run it.
• Best for a pet home: a Shark with a self-emptying base. The $127.50 RV100S is the pick if your budget allows; the $55.99 IQ if it does not.
• Best for hard floors you want mopped: Roborock, and specifically the $120 Q7 Max with its stated 350ml-plus bin architecture and washable filters, or the Q8 Max+ at $359.99 if you want the top of the range.
• Best for a small flat or rental on a strict budget: the $34.99 new Shark ION RV850BRN, accepting contact navigation and manual bin emptying.
• Best for someone who just wants it to work and does not care about brands: the $199.99 new Roomba 692, with three-stage filtration and voice assistant support and no mopping to go wrong.

Before you buy any of them, do the unglamorous work. Confirm the dock is included, confirm the charger is included, confirm the bin and at least one filter are present, and read the seller's description of testing rather than assuming it. Units described as tested and working with a stated runtime are the safe buys. Anything that says untested, will not charge, or for parts is not a deal no matter what the price says, and several listings in this article are flagged for exactly that reason.

And remember the caveat that applies to every number on this page: eBay prices change and vary by seller and condition. Used robots in particular sell in waves and can be gone within a day of a good price appearing. If you want the longer version of this reasoning on a specific machine, our Roomba alternatives roundup covers the non-iRobot side in detail, and the dedicated Roomba versus Roborock review goes deeper on the head-to-head that matters most here.