Roborock Qrevo CurvX vs Roomba j9+

Side-by-Side Comparison

Suction Power

Winner: Roborock Qrevo CurvX (22,000 Pa vs ~2,200 Pa)

The Roborock has nearly 10x the advertised suction figure. On hard floors, both perform well. On carpets — especially medium and high pile — the Roborock pulls significantly more embedded dirt. iRobot's Carpet Boost helps by automatically increasing power on rugs, and the rubber brushes maintain consistent contact with carpet fibers.

A note on the suction numbers

Before the 22,000 versus 2,200 gap decides anything for you, read it the way this site reads every Pa figure: as a within-brand signal, not a cross-brand ranking. There is no standardized, third-party test protocol for measuring or reporting Pa. Manufacturers test at different points in the airflow path, under different conditions, and some report sealed suction while others report a related but different airflow figure. Several years ago a strong flagship rating sat in the roughly 2,000 to 2,500 Pa range; current flagship marketing routinely advertises 20,000 Pa and up, which reflects, at least in part, a shift toward more favorable measurement points as the number became a marketing lever. Even inside Roborock's own range, the budget Q7 M5+ is rated at 10,000 Pa, a reminder that Pa alone does not rank machines even within one brand. What actually predicts real-world cleaning is automatic carpet detection and boost, brush roll design, airflow and dustbin engineering, and navigation quality. For most homes, mid-range suction is plenty; hard floors clean easily regardless of Pa rating, and it is really only thick carpet or heavy pet shedding that benefit from the higher end. See are Pa ratings comparable between brands and how much suction power you actually need.

Mopping

Winner: Roborock Qrevo CurvX (the Roomba can't mop at all)

This isn't close. The Roborock has a dual spinning mops system, and its dock washes the pads with hot water and dries them with hot air. The Roomba j9+ is a vacuum-only unit with zero mopping capability. If you have hard floors (tile, hardwood, laminate), this alone may decide the purchase.

Keep expectations honest, though. Robot mops work well for daily maintenance, light dust, everyday foot traffic, casual residue, but they are not a substitute for manually mopping sticky spills or deep grime, and the Qrevo CurvX's mop performance on dried or caked stains is still limited. You can set room-specific cleaning preferences on the Roborock: vacuum-only for carpeted bedrooms, mop-heavy for kitchen tile. The single biggest real-world failure mode for mop pads is hygiene rather than cleaning performance: a damp pad left sitting in the robot between runs develops a musty smell. The Roborock dock's hot-water wash and hot-air dry after each run removes that friction entirely, which is a bigger factor in long-term satisfaction than the mopping mechanism itself. See do robot mops actually work and the best robot vacuum and mop combos for the other machines that vacuum and mop.

Pet Hair Performance

Winner: iRobot Roomba j9+

The Roomba's dual rubber brush extractors are the gold standard for pet hair. They maintain constant contact with floor surfaces and never tangle — even with long human hair mixed in. The Roborock uses a traditional brush roll with rubber fins, which is good but requires occasional manual de-tangling after heavy pet hair sessions.

This is why the lowest-suction machine in our coverage is still the pet-hair pick. Brush roller design matters more than raw suction for pet hair households: long hair readily wraps around a spinning roller and gradually chokes it until suction effectively drops regardless of the motor's rated Pa. Suction only matters once the hair has already reached the brush. Rubber rollers use a smoother, ridged surface instead of bristles so hair tends to slide off rather than catch and wind, though a purely rubber roller can be slightly less aggressive at deep carpet agitation than bristles. Roborock is not standing still on this: the Qrevo CurvX uses Roborock's Zero-Tangling Design rated for hair up to 40 cm. Even with an anti-tangle design, weekly checks of the brush roller are a reasonable baseline for households with heavy shedders. See robot vacuums and pet hair and the best robot vacuums for pet hair.

Obstacle Avoidance

Winner: Tie

Both excel here but differently. The Roborock's Reactive AI obstacle recognition uses 3D structured light to identify 70+ objects. The Roomba's PrecisionVision uses a front-facing camera — it's specifically excellent at detecting pet waste (a critical feature for dog owners). Both reliably avoid shoes, cables, and toys.

Navigation and mapping

Winner: Roborock Qrevo CurvX

Obstacle avoidance and room-scale mapping are two different jobs, and this is where the two designs diverge. The Roborock pairs PreciSense LiDAR mapping with a 3D structured-light sensor: a spinning laser turret measures distances directly, builds a precise map of the room, and works exactly the same whether the lights are on, off, or the curtains are drawn. The Roomba j9+ uses its PrecisionVision camera with no LiDAR. Camera-based (vSLAM) navigation can perform very well in bright, well-lit homes, but its accuracy depends more on lighting and visual landmarks, and it can lose its bearings in visually repetitive spaces or very dim rooms. If your home has rooms that are ever dark when the robot might run, a basement, an interior room, an overnight schedule, prioritize LiDAR. Many current flagships combine both, LiDAR for mapping plus a camera for close-range obstacle identification, and the hybrid approach in the Qrevo CurvX is what gives you accurate whole-room maps plus reliable last-foot dodging without a lighting dependency. iRobot's app is generally considered more mature and consistent after years of iteration, and Roomba's camera-based obstacle recognition has the longest track record in the category. See LiDAR vs camera navigation.

Under-furniture reach and thresholds

Winner: Roborock Qrevo CurvX

The Qrevo CurvX's 3.14-inch body is the slimmest Roborock yet, and it fits under sofas and cabinets that stop taller robots. It has no extending arm; that slim body is its reach advantage. At the other extreme, the AdaptiLift chassis lifts the whole body up to 4 cm, or one section at a time, front, rear, left or right, to clear high thresholds and work around furniture legs. Adequate ground clearance matters if you have thick-pile rugs or raised thresholds, because thick-pile rugs can exceed a robot's ground clearance and stall it. This site does not record a body height or threshold-climbing figure for the Roomba j9+, so we will not put a number beside it.

Dock & Maintenance

Winner: Roborock Qrevo CurvX

The Multifunctional Dock 3.0 Thermo+ handles everything: empties dustbin (7 weeks capacity), refills water tank, hot-washes mops, and hot-air dries them. The Roomba's dock only empties the dustbin (60-day capacity). You never touch the Roborock's dock for weeks; the Roomba still requires you to manage water/cleaning if you had a mopping model.

Both docks are a genuine step up from a basic charging dock. A self-empty dock extends manual dustbin emptying from every cleaning run to roughly once every few weeks to a couple of months, which is the single biggest hands-off upgrade available in the category, and pet owners benefit disproportionately since the alternative is emptying a small bin almost daily. What neither dock removes is the robot-side routine: clear hair from the main brush and side brushes weekly, wipe the cliff sensors and camera or LiDAR lens monthly, replace disposable HEPA filters every 1 to 2 months because suction drops noticeably once they clog, and replace the dock's bag when it fills. The Roomba's rubber rollers last, but its filters and bags do not. A large dock footprint requires dedicated floor space for the Roborock. See are self-empty docks worth it and our maintenance schedule.

Runtime and recharging

iRobot publishes neither a runtime nor a bin capacity for the Roomba j9+; like most modern robots it simply recharges mid-job and resumes. The Roborock is rated at 6,400 mAh and 53 dB in quiet mode, and manufacturers state runtime in the lowest-power mode, so higher suction modes can cut it to roughly a third and mopping draws extra power. In practice runtime rarely determines whether the whole home gets cleaned; it determines how many charging breaks that takes. Nearly all current models auto-return to the dock, recharge, and resume the same job. See the Runtime and Bin Index.

Roborock Qrevo CurvX pros and cons

iRobot Roomba j9+ pros and cons

The Verdict

Buy the Roborock Qrevo CurvX if:

• You want the best overall cleaning (vacuum + mop)
• You have hard floors that need regular mopping
• You want maximum automation (hands-off for weeks)
• You run cleans in dark rooms or overnight and want LiDAR
• Budget isn't the primary concern

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Buy the iRobot Roomba j9+ if:

• You have dogs or cats and pet hair is the main problem
• You primarily have carpeted floors
• You want proven reliability and great customer support
• You want to spend significantly less

Check price on Amazon →

Not deciding today? Add it to your cart over there — Amazon keeps it saved (and flags any price change) until you’re ready.

Where each one lands in our buying guides

The Qrevo CurvX is our best overall robot vacuum and the best all-rounder on Amazon; the Roomba j9+ is our pick for pet hair despite its modest suction number. If you want one machine that vacuums and mops, the best robot vacuum and mop combo guide compares the Roborock with the Dreame L40 Ultra Gen 2, Ecovacs Deebot X5 Pro Omni, and the budget Roborock Q7 M5+. If shedding pets are the job, best robot vacuum for pet hair puts the Roomba alongside the anti-tangle flagships. Best robot vacuum on Amazon ranks the whole field by job.

Last updated: September 4, 2026. Suction figures are manufacturer specs and are not comparable across brands.