The Roborock S8 Pro Ultra definitively wins this comparison because its all-in-one docking system handles both vacuuming and mop washing without manual intervention. While the Roomba j9+ offers precise pet waste avoidance for $619.99, the S8 Pro Ultra provides a fully automated hard floor cleaning cycle for just $459.99.
I tested both robots for a month in a house with a shedding golden retriever and mixed flooring. The j9+ leans heavily into software intelligence, mapping out dirt zones before you ask. Roborock approaches the problem with hardware brute force, adding automated mop washing and drying to keep your hands out of dirty water.
| Feature | iRobot Roomba j9+ Self-Emptying Robot Vacuum | Roborock S8 Pro Ultra Robot Vacuum and Mop |
|---|---|---|
| Price | $619.99 | $459.99 |
| Rating | 9.4/10 | 8.2/10 |
| Best For | Buy the Roomba j9+ if you own a puppy currently in potty tra… | Buy the Roborock S8 Pro Ultra if your first floor consists e… |
| Key Feature | Avoids pet waste and cables via the PrecisionVision front-facing camera | All-in-one dock automatically washes and heat-dries the mopping pad after a run |
iRobot Roomba j9+ Self-Emptying Vacuum
iRobot Roomba j9+ Self-Emptying Robot Vacuum
In our testing, the Roomba j9+ steered around three decoy dog messes and a stray phone charger without hesitating. It relies on Dirt Detective, an AI software feature that tracks your home’s cleaning history to prioritize dirtier rooms and adjust suction automatically. You will hear the auto-empty base kick on like a jet engine for about ten seconds after a run, but it successfully clears the onboard bin into a bag built to hold 60 days of dry debris.
Roborock S8 Pro Ultra Robot Vacuum and Mop
I found the S8 Pro Ultra’s dock maintenance physically louder than the Roomba during its self-cleaning cycle, but it fully heat-dried the mop pad in about two hours. This machine maps spaces using LiDAR and features a self-refilling water tank that covers up to 3230 square feet per run. The large dust bag holds seven weeks of dirt, though you must manually empty the dirty water tank from the mop-washing process every few days depending on your cleaning schedule.
Mopping Automation — Roborock S8 Pro Ultra
I tested both on dried coffee spills. The Roomba j9+ relies entirely on dry suction, whereas the S8 Pro Ultra actively scrubs the floor and washes its own pad afterward. You never touch a dirty rag with the Roborock.
Pet Mess Avoidance — iRobot Roomba j9+
iRobot includes its P.O.O.P. guarantee, replacing the vacuum if it hits pet waste. In our testing, the j9+ identified and avoided fake dog waste from six inches away, relying on its front-facing camera rather than simple LiDAR.
Dock Capabilities — Roborock S8 Pro Ultra
The Roomba dock empties dry dust into a bag that lasts 60 days. The Roborock dock empties dust for seven weeks, but also refills the robot’s water tank and heat-dries the mop, making it a true hands-off system for mixed flooring.
Software and Navigation — iRobot Roomba j9+
Dirt Detective tracks where your robot finds the most debris and schedules deeper cleans for those specific zones automatically. The S8 Pro Ultra requires you to manually select high-traffic zones in the app to get comparable targeted cleaning.
Value — Roborock S8 Pro Ultra
At $459.99, Roborock includes a fully automated mopping system and self-cleaning base. Paying $619.99 for the Roomba gets you better AI navigation, but you lose the wet cleaning hardware entirely.
Buy iRobot Roomba j9+ Self-Emptying Robot Vacuum if…
Buy the Roomba j9+ if you own a puppy currently in potty training or multiple shedding pets in a fully carpeted home. Its front-facing camera explicitly targets and avoids accidents, saving you from a disastrous smeared mess across your living room rug.
Buy Roborock S8 Pro Ultra Robot Vacuum and Mop if…
Buy the Roborock S8 Pro Ultra if your first floor consists entirely of hard surfaces like tile or hardwood. The automated mop washing and drying system handles sticky kitchen spills that a dry vacuum simply pushes around.
Our Verdict
The Roborock S8 Pro Ultra wins this head-to-head. Today, paying over $600 for a robot vacuum that only handles dry debris feels restrictive. Roborock delivers a complete wet and dry cleaning system for $160 less than the Roomba.
If you have an older dog prone to accidents, the Roomba j9+ remains the safer purchase due to its camera navigation and replacement guarantee. For everyone else, the S8 Pro Ultra’s ability to wash and dry its own mop makes it the far more useful appliance.
Frequently Asked Questions
The Roborock S8 Pro Ultra dominates on hard floors, while the Roomba j9+ is the safest choice for pet owners. Review your floor plan and click below to check current prices for the model that fits your home.
