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2026 comparison
Updated Jan 16, 2026
|Sources: Amazon, ManufactureriRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop vs Roborock S8 Pro Ultra Robot Vacuum and Mop
Choosing between iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop and Roborock S8 Pro Ultra Robot Vacuum and Mop can be tricky. Both are excellent, but they serve different priorities. This guide highlights what matters for US shoppers.
Ratings: 3.6★ vs 4.1★
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iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop
★3.6
(1,171)•Amazon
Navigation:PrecisionVision Navigation (Camera-based VSLAM with object recognition and avoidance).
Mapping:Imprint Smart Mapping (Stores up to 10 maps, room segmentation, room naming, and Keep Out Zones).
Obstacle Avoidance:PrecisionVision with AI (Identifies and avoids cords, pet waste, shoes, socks, and seasonal items).
Suction Pa:Not published (Rated 100% stronger suction vs. Roomba i-Series / 2x Power-Lifting Suction).
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Roborock S8 Pro Ultra Robot Vacuum and Mop
★4.1
(856)•Amazon
Navigation:PreciSense LiDAR Navigation (Systematic route planning with adaptive algorithms).
Mapping:LiDAR mapping (3D Mapping, Matrix Map, Quick Mapping, Multi-level mapping up to 4 floors).
Obstacle Avoidance:Reactive 3D Obstacle Avoidance (Structured light + 3D infrared imaging; privacy-focused).
Suction Pa:6,000 Pa (HyperForce Suction)
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Comparison: iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop vs Roborock S8 Pro Ultra Robot Vacuum and Mop
iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop
★3.6(1,171)Amazon
Roborock S8 Pro Ultra Robot Vacuum and Mop
★4.1(856)Amazon
| Criterion | iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop | Roborock S8 Pro Ultra Robot Vacuum and Mop |
|---|---|---|
| Rating | ★3.6(1,171)Amazon | ★4.1(856)Amazon |
Navigation | PrecisionVision Navigation (Camera-based VSLAM with object recognition and avoidance). | PreciSense LiDAR Navigation (Systematic route planning with adaptive algorithms). |
Mapping | Imprint Smart Mapping (Stores up to 10 maps, room segmentation, room naming, and Keep Out Zones). | LiDAR mapping (3D Mapping, Matrix Map, Quick Mapping, Multi-level mapping up to 4 floors). |
Obstacle Avoidance | PrecisionVision with AI (Identifies and avoids cords, pet waste, shoes, socks, and seasonal items). | Reactive 3D Obstacle Avoidance (Structured light + 3D infrared imaging; privacy-focused). |
Suction Pa | Not published (Rated 100% stronger suction vs. Roomba i-Series / 2x Power-Lifting Suction). | 6,000 Pa (HyperForce Suction) |
Brush System | Dual Multi-Surface Rubber Brushes (Resistant to hair tangles) + Edge-Sweeping Brush. | DuoRoller Riser Brush (Dual counter-rotating rubber brushes that automatically lift for mopping-only mode). |
Mopping | SmartScrub System (Back-and-forth scrubbing motion with consistent pressure). | VibraRise 2.0 Sonic Mopping (Dual vibration modules scrubbing at 3,000 times/min with consistent pressure). |
Mop Lift | Auto-Retract Mopping System (Lifts mop pad to the top of the robot to keep carpets completely dry). | 0.20" (5 mm) Automatic Mop Lifting |
Carpet Boost | Yes (Carpet Boost automatically increases suction on carpets). | Carpet Boost+ System (Ultrasonic detection, brush lifting, and suction boost). |
Battery | 14.4V / 4460 mAh Lithium-ion | 14.4V / 5200 mAh Lithium-ion |
Runtime | Up to 120 min (Recharge and Resume supported) | Up to 180 min (Quiet Mode) |
Charging Time | Approx. 3 hours | Approx. 4 hours (Supports 30% Fast Charging) |
Dustbin | 0.08 gal (313 mL) — Internal bin | 0.09 gal (350 mL) — Internal bin |
Water Tank | 0.05 gal (210 mL) — Internal tank (Auto-refilled by dock) | 0.05 gal (200 mL) — Internal tank (Auto-refilled by dock) |
Auto Empty | Yes | Yes |
Dock Type | Clean Base Auto-Fill Dock (Empties debris for up to 60 days, refills water for up to 30 days; 15.8" W x 16.4" D x 16.3" H). | RockDock Ultra (Emptying, Washing, Drying, Refilling, Self-Cleaning). Tanks: 3.5L Clean Water, 2.9L Dirty Water, 2.5L Dust Bag. Dims: 16.8" x 20.2" x 17.7". |
Mop Wash | No (Pad requires manual washing) | Yes (Automatic mop washing during and after cleaning) |
Mop Dry | No | Yes (Warm Air Drying for mop and dock base) |
Filtration | High-Efficiency Filter (Captures 99% of cat and dog allergens) | E11 Rated Washable Filter |
Noise Level | Approx. 68 dB | 68.5 dB (Balanced Mode) |
App Features | iRobot Home App (Dirt Detective prioritizes dirty rooms, Clean While I'm Away, SmartScrub settings, Pet Owner Official Promise). | Roborock App (Smart No-Go Zones, Deep Carpet Cleaning, Floor Direction Cleaning, Off-Peak Charging). |
Voice Assistants | Amazon Alexa, Google Assistant, Apple Siri. | Amazon Alexa, Google Home, Apple Siri Shortcuts. |
Multi Floor | Yes (Imprint Smart Mapping stores multiple floor plans). | Yes (Up to 4 map levels). |
Threshold Climb | 0.6" (1.6 cm) — Reduced slightly due to mopping mechanism | 0.79" (20 mm) |
Height | 3.40" (87 mm) | 3.80" (96.5 mm) |
Dimensions | 13.70" (L) x 13.70" (W) x 3.40" (H) | 13.90" (L) x 13.80" (W) x 3.80" (H) |
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iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop
Rating:★3.6(1,171)Amazon
Navigation:PrecisionVision Navigation (Camera-based VSLAM with object recognition and avoidance).
Mapping:Imprint Smart Mapping (Stores up to 10 maps, room segmentation, room naming, and Keep Out Zones).
Obstacle Avoidance:PrecisionVision with AI (Identifies and avoids cords, pet waste, shoes, socks, and seasonal items).
Suction Pa:Not published (Rated 100% stronger suction vs. Roomba i-Series / 2x Power-Lifting Suction).
Brush System:Dual Multi-Surface Rubber Brushes (Resistant to hair tangles) + Edge-Sweeping Brush.
Mopping:SmartScrub System (Back-and-forth scrubbing motion with consistent pressure).
Mop Lift:Auto-Retract Mopping System (Lifts mop pad to the top of the robot to keep carpets completely dry).
Carpet Boost:Yes (Carpet Boost automatically increases suction on carpets).
Battery:14.4V / 4460 mAh Lithium-ion
Runtime:Up to 120 min (Recharge and Resume supported)
Charging Time:Approx. 3 hours
Dustbin:0.08 gal (313 mL) — Internal bin
Water Tank:0.05 gal (210 mL) — Internal tank (Auto-refilled by dock)
Auto Empty:Yes
Dock Type:Clean Base Auto-Fill Dock (Empties debris for up to 60 days, refills water for up to 30 days; 15.8" W x 16.4" D x 16.3" H).
Mop Wash:No (Pad requires manual washing)
Mop Dry:No
Filtration:High-Efficiency Filter (Captures 99% of cat and dog allergens)
Noise Level:Approx. 68 dB
App Features:iRobot Home App (Dirt Detective prioritizes dirty rooms, Clean While I'm Away, SmartScrub settings, Pet Owner Official Promise).
Voice Assistants:Amazon Alexa, Google Assistant, Apple Siri.
Multi Floor:Yes (Imprint Smart Mapping stores multiple floor plans).
Threshold Climb:0.6" (1.6 cm) — Reduced slightly due to mopping mechanism
Height:3.40" (87 mm)
Dimensions:13.70" (L) x 13.70" (W) x 3.40" (H)
✓ Pros:
- • Clean Base Auto-Fill Dock automates both dust emptying and water refilling
- • Auto-Retract Mopping System is the industry standard for keeping high-pile carpets dry
- • Dirt Detective (iRobot OS) automatically prioritizes the dirtiest rooms
- • Dual Multi-Surface Rubber Brushes are excellent for pet hair and carpets
- • Elegant dock design with a wood-like surface top
✗ Cons:
- • Dock does not wash or dry the mop pad (requires manual maintenance)
- • Navigation and mapping are slower than LiDAR-based competitors
- • Lacks live video monitoring despite having a camera (privacy-focused)
- • Small onboard dustbin relies heavily on frequent auto-emptying
As an Amazon Associate I earn from qualifying purchases.
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Roborock S8 Pro Ultra Robot Vacuum and Mop
Rating:★4.1(856)Amazon
Navigation:PreciSense LiDAR Navigation (Systematic route planning with adaptive algorithms).
Mapping:LiDAR mapping (3D Mapping, Matrix Map, Quick Mapping, Multi-level mapping up to 4 floors).
Obstacle Avoidance:Reactive 3D Obstacle Avoidance (Structured light + 3D infrared imaging; privacy-focused).
Suction Pa:6,000 Pa (HyperForce Suction)
Brush System:DuoRoller Riser Brush (Dual counter-rotating rubber brushes that automatically lift for mopping-only mode).
Mopping:VibraRise 2.0 Sonic Mopping (Dual vibration modules scrubbing at 3,000 times/min with consistent pressure).
Mop Lift:0.20" (5 mm) Automatic Mop Lifting
Carpet Boost:Carpet Boost+ System (Ultrasonic detection, brush lifting, and suction boost).
Battery:14.4V / 5200 mAh Lithium-ion
Runtime:Up to 180 min (Quiet Mode)
Charging Time:Approx. 4 hours (Supports 30% Fast Charging)
Dustbin:0.09 gal (350 mL) — Internal bin
Water Tank:0.05 gal (200 mL) — Internal tank (Auto-refilled by dock)
Auto Empty:Yes
Dock Type:RockDock Ultra (Emptying, Washing, Drying, Refilling, Self-Cleaning). Tanks: 3.5L Clean Water, 2.9L Dirty Water, 2.5L Dust Bag. Dims: 16.8" x 20.2" x 17.7".
Mop Wash:Yes (Automatic mop washing during and after cleaning)
Mop Dry:Yes (Warm Air Drying for mop and dock base)
Filtration:E11 Rated Washable Filter
Noise Level:68.5 dB (Balanced Mode)
App Features:Roborock App (Smart No-Go Zones, Deep Carpet Cleaning, Floor Direction Cleaning, Off-Peak Charging).
Voice Assistants:Amazon Alexa, Google Home, Apple Siri Shortcuts.
Multi Floor:Yes (Up to 4 map levels).
Threshold Climb:0.79" (20 mm)
Height:3.80" (96.5 mm)
Dimensions:13.90" (L) x 13.80" (W) x 3.80" (H)
✓ Pros:
- • Truly hands-off maintenance with the all-in-one RockDock Ultra (Washes, Dries, Refills, Empties)
- • DuoRoller Riser brushes resist hair tangles and lift up for quiet mopping
- • VibraRise 2.0 provides double the scrubbing area for stubborn stains compared to previous models
- • Reactive 3D avoidance navigates furniture and clutter without cameras (privacy-safe)
- • Fast charging support reduces downtime in large homes
✗ Cons:
- • High price point places it firmly in the luxury tier
- • Lacks an RGB camera for live video monitoring (unlike the S7 MaxV)
- • Large dock footprint requires significant floor space
- • Corner cleaning is less effective than D-shaped units or extending mop arms
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Which one is better?
Based on ratings and feature balance, Roborock S8 Pro Ultra Robot Vacuum and Mop has a slight edge for specific features. iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop remains a strong alternative if its strengths match your needs.
Who should buy each?
Expert take:
- iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop suits buyers who need Clean Base Auto-Fill Dock automates both dust emptying and water refilling, Auto-Retract Mopping System is the industry standard for keeping high-pile carpets dry
- Roborock S8 Pro Ultra Robot Vacuum and Mop suits buyers who want Truly hands-off maintenance with the all-in-one RockDock Ultra (Washes, Dries, Refills, Empties), DuoRoller Riser brushes resist hair tangles and lift up for quiet mopping
Conclusion
With the key differences outlined, the decision should be clearer. Both options deliver quality—choose the one that fits your priorities.
Frequently Asked Questions
+Which has better value?
iRobot Roomba Combo j9+ Auto-Fill Robot Vacuum and Mop excels if you value clean base auto-fill dock automates both dust emptying and water refilling. Roborock S8 Pro Ultra Robot Vacuum and Mop is better if you prioritize truly hands-off maintenance with the all-in-one rockdock ultra (washes, dries, refills, empties). Pick based on your budget and daily use.
+Is this an independent review?
Yes. We use affiliate links for monetization, but recommendations are research-driven and unbiased.
+Do newer models exist?
Check release timelines from the manufacturers and compare pricing before you buy. We refresh this page when major updates land.
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