iRobot Roomba Plus 678 Combo
A strong pick for hard-floor homes that want hot-water roller mopping and a full-service dock for less than iRobot’s flagship 875.
Amazon $899.99$899.99
The iRobot Roomba Plus 678 Combo is the better robot vacuum overall, rated 3.9 to 3.7. The iRobot Roomba Plus 678 Combo leads on value. The iRobot Roomba Plus 678 Combo costs $299.98 less ($899.99 vs $1,199.97).
iRobot Roomba Max 875 Combo
iRobot’s flagship, for hard-floor homes that want hot-water mopping.
Amazon $1,199.97$1,199.97
Prices were last checked October 26, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the iRobot Roomba Plus 678 Combo for value ($900 vs $1,200).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every self-cleaning dock robot vacuum; a clear win is highlighted. How we rank explains each one.
| Factor weight | iRobot Roomba Plus 678 Combo | iRobot Roomba Max 875 Combo |
|---|---|---|
| Overall rating | 3.9/5 | 3.7/5 |
| Cleaning 30% | 48 not yet tested; estimated from 3 tested iRobot robots and the median of the 70 tested robots | 48 not yet tested; estimated from 3 tested iRobot robots and the median of the 70 tested robots |
| Value 25% | 42 $900 | 25 $1,200 |
| Dock 20% | 100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent | 100 Self-empties the bin, washes the mop, hot-water mop wash, hot-air mop drying, doses detergent |
| Navigation 15% | 100 LiDAR + camera | 100 LiDAR + camera |
| Mopping 10% | 90 Roller, lifts 10 mm, extends to edges | 85 Roller, extends to edges |
Specifications
| iRobot Roomba Plus 678 Combo | iRobot Roomba Max 875 Combo | |
|---|---|---|
| Vacuum | ||
| Claimed suction | 30,000 Pa | 40,000 Pa |
| Main brush | hair-cutting multi-surface bristle brush | hair-cutting bristle brush |
| Mopping | ||
| Mop | Roller, lifts 10 mm, extends to edges | Roller, extends to edges |
| Mop lift | 10 mm | - |
| Leaves mop at dock | No | No |
| Extending mop | Yes | Yes |
| Dock | ||
| Dock | Washes mop + empties | Washes mop + empties |
| Self-empties | Yes | Yes |
| Washes mop | Yes | Yes |
| Hot-water wash | Yes | Yes |
| Hot-air drying | Yes | Yes |
| Detergent dosing | Yes | Yes |
| Navigation & app | ||
| Navigation | LiDAR + camera | LiDAR + camera |
| Obstacle avoidance | PrecisionVision AI camera object recognition; SprayForce AI pre-treats detected stains | PrecisionVision AI camera, recognizes 300+ objects |
| Climbs thresholds | 35 mm | 35 mm |
| Build | ||
| Height | 3.9 in (99 mm) | 3.9 in (100 mm) |
| Battery | 6,000 mAh | 5,000 mAh |
| Weight | 10.7 lb (4.8 kg) | 12 lb (5.4 kg) |
| Released | 2026-09 | 2026-09 |