iRobot Roomba Plus 405 Combo vs iRobot Roomba Plus 505 Combo
Researched by Riley Hart · prices checked Nov 4, 2026
As of Nov 4, 2026, the iRobot Roomba Plus 405 Combo costs $800 and the iRobot Roomba Plus 505 Combo costs $1,000, so the iRobot Roomba Plus 405 Combo is $200 cheaper. Pick the iRobot Roomba Plus 405 Combo for hard floor homes on a deep discount. Pick the iRobot Roomba Plus 505 Combo for families who want mopping right up to walls. The iRobot Roomba Plus 405 Combo wins 1 of 2 points we can measure (1 tied).
Who wins, point by point
The iRobot Roomba Plus 405 Combo wins 1 of 2 points we can measure (1 tied). Built from today's prices, the specs and independent tests for these two robots.
| Roomba Plus 405 Combo | Roomba Plus 505 Combo | Winner | |
|---|---|---|---|
| Price today | $800 | $1,000 | Roomba Plus 405 Combo |
| Robot height (fits under furniture) | 4.2 in | 4.2 in | Tie |
- You want to spend less (saves $200)
- Best for hard floor homes on a deep discount
- Best for families who want mopping right up to walls
- Suction
- iRobot claims 70x
- Navigation
- ClearView LiDAR
- Mopping
- DualClean spinning pads
iRobot's LiDAR combo with spinning mop pads and a pad washing dock
Full iRobot Roomba Plus 405 Combo review, pros and cons →- Suction
- iRobot claims up to 70x
- Navigation
- ClearView Pro LiDAR
- Mopping
- Two DualClean spinning
- Runtime
- 3 hours
LiDAR Roomba with spinning mops and a dock that washes and dries them
Full iRobot Roomba Plus 505 Combo review, pros and cons →Side by side
| iRobot Roomba Plus 405 Combo | iRobot Roomba Plus 505 Combo | |
|---|---|---|
| Price | $800 | $1,000 |
| 3 year cost | $800 | $1,000 |
| Our score | Not scored yet | Not scored yet |
| Rank in Floors | #74 | #88 |
| Status | on sale | on sale |
| Warranty | n/a | n/a |
| Suction | iRobot claims 70x the suction of Roomba 600 series, with 4 levels; Vacuum Wars measured 0.13 kPa against a 0.83 kPa average | iRobot claims up to 70x the suction of Roomba 600 series robots with 4 levels; New Atlas lists 7,000 Pa |
| Navigation | ClearView LiDAR, maps about 1,000 sq ft in 9 minutes and stores up to 4 maps (iRobot); Vacuum Wars measured 0.76 m2/min against a 0.70 average | ClearView Pro LiDAR, up to 5 maps, about 9 min to map 1,000 sq ft (iRobot); Tom's Guide saw mapping in 5 to 7 min |
| Obstacle avoidance | No obstacle avoidance sensors (Vacuum Wars); BestReviews saw it tangle on cords twice in one run | PrecisionVision AI for cords, socks, shoes and pet waste (iRobot); New Atlas saw it occasionally swallow socks and cables |
| Mopping | DualClean spinning pads at 200 RPM with SmartScrub and auto lift on carpet (iRobot); Vacuum Wars scored 145 on dried stains against a 93 average but found it left 5.20 g of water against a 1.01 g average | Two DualClean spinning pads at 200 RPM that extend toward edges and lift on carpet (iRobot) |
| Self empty | Yes, bagged, up to 75 days based on one run per week (iRobot) | Yes, bagged, about 75 days of auto emptying per bag (iRobot) |
| Dock features | AutoWash dock empties the bin, washes and dries the pads and runs a self cleaning water cycle (iRobot); Vacuum Wars notes no hot water wash or hot air drying | AutoWash dock empties debris, washes pads, heat dries pads and self cleans; clean and dirty water tanks (iRobot) |
| Dustbin | 0.1 gal robot bin (Best Buy listing) | n/a |
| Height | 4.2 in; robot is 14.1 x 13.8 x 4.2 in and 9.06 lb (iRobot) | 4.2 in robot height (iRobot) |
| Pet hair | Vacuum Wars measured 50% flattened pet hair pickup on carpet against a 66% average and 17% hair wrap; BestReviews saw 90% to 95% faux fur pickup on hard floors but under 50% on carpet | Tom's Guide saw no dog hair tangles over 20+ runs; New Atlas found hair wrapping the ends of the brush |
| App | Roomba Home app with routines, Clean Zones and Keep Out Zones; works with Alexa, Siri and Google Assistant (iRobot); Vacuum Wars and BestReviews called the app buggy or basic | Roomba Home app; Matter enabled, works with Apple Home, Alexa, Siri and Google Assistant (iRobot) |
| Noise | Dock emptying measured 87.8 dBA by Vacuum Wars and 80 to 85 dB by BestReviews | Tom's Guide measured about 65 dB vacuuming and mopping, 87 dB when the dock empties the bin |
| Runtime | n/a | 3 hours (spec sheet cited by Tom's Guide); iRobot's page lists no runtime |
| Threshold | n/a | Not stated by iRobot; Tom's Guide said it crossed thresholds without problems, New Atlas called step climbing clunky |
| Best for | hard floor homes on a deep discount | families who want mopping right up to walls |
| Skip if | you have carpet, pets or cables on the floor | you want a quiet dock or have lots of loose cables |
Specs are maker claims unless a reviewer is named. Prices from the stores we link, checked daily.
What reviewers found
iRobot Roomba Plus 405 Combo
- Vacuum Wars (1.66 Vacuum Wars stars): Measured 0.13 kPa suction and 10 CFM airflow against 0.83 kPa and 16 CFM averages, 58% carpet deep clean against 75%, 50% flattened pet hair against 66%, and 5.20 g of water left behind. Dried stain score of 145 beat the 93 average. Called it a letdown. Source
- BestReviews: Tested in a 1,000 sq ft two level apartment. Picked up 90% to 95% of faux fur on hard floors but under 50% on carpet, spread spilled water, tangled on cords twice in one run, and the dock measured 80 to 85 dB when emptying. Testers did not recommend it. Source
iRobot Roomba Plus 505 Combo
- Tom's Guide: Mapped the home in 5 to 7 minutes, avoided shoes and toys, and had no dog hair tangles over 20+ runs. Measured about 65 dB in auto mode and 87 dB when the dock empties the bin. Spot clean was less thorough and the app sometimes glitched. Source
- New Atlas: After one to two months in a family home, praised wall and corner mopping and low upkeep, but found it noisy, saw hair wrap the brush ends, and saw it swallow socks and cables now and then. Called it a great buy at about $599. Source
Questions buyers ask
Which is better, the iRobot Roomba Plus 405 Combo or the iRobot Roomba Plus 505 Combo?
Pick the iRobot Roomba Plus 405 Combo for hard floor homes on a deep discount. Pick the iRobot Roomba Plus 505 Combo for families who want mopping right up to walls.
Which is cheaper?
The iRobot Roomba Plus 405 Combo at $800, versus $1,000 for the iRobot Roomba Plus 505 Combo, checked Nov 4, 2026. Over 3 years with running costs: $800 vs $1,000.
What is the difference between the Roomba Plus 405 Combo and the Roomba Plus 505 Combo?
Suction: iRobot claims 70x the suction of Roomba 600 series, with 4 levels; Vacuum Wars measured… on the Roomba Plus 405 Combo, iRobot claims up to 70x the suction of Roomba 600 series robots with 4 levels; New Atlas… on the Roomba Plus 505 Combo. Navigation: ClearView LiDAR, maps about 1,000 sq ft in 9 minutes and stores up to 4 maps (iRobot)… on the Roomba Plus 405 Combo, ClearView Pro LiDAR, up to 5 maps, about 9 min to map 1,000 sq ft (iRobot); Tom's Guide… on the Roomba Plus 505 Combo. Obstacle avoidance: No obstacle avoidance sensors (Vacuum Wars); BestReviews saw it tangle on cords twice in… on the Roomba Plus 405 Combo, PrecisionVision AI for cords, socks, shoes and pet waste (iRobot); New Atlas saw it… on the Roomba Plus 505 Combo.
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