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Robovations
Robovations™
Robot Autonomy, Classified
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Comparison · 2 robots

iRobot Roomba j7+ · iRobot Roomba Plus 678 Combo

All robot vacuums. Every measure below is plotted against the full class, so a difference can be read against how much the class itself varies.

  1. iRobot Roomba j7+
  2. iRobot Roomba Plus 678 Combo

Up to three

01 Classification

What each one does on its own.

The Autonomy Ladder is the same five rungs for every robot on the site. A rung describes the conditions a robot handles without you, not how good it is.

V
Generalized
Any task, any setting
IV
Environmental
Handles new obstacles without help
III
Conditional
Finishes familiar jobs on its own
iRobot Roomba j7+iRobot Roomba Plus 678 Combo
II
Assisted
Runs preset routines, needs rescue
I
Manual
One action, on command
02 Assessment

Where they actually differ.

The Robovations Score is nine inputs across three pillars, each weighted as shown and each scored so that more is better. A robot can lead on one and trail on another, which is the point of showing them apart. Cost of ownership and data handling are reported on each robot's own page and are never averaged into the score.

Capability

Task completion16% of score
Does it finish the job it is sold to do, unattended
  • iRobot Roomba j7+80
  • iRobot Roomba Plus 678 Combo60
18median 72 across 429 scored robots100
Coverage and navigation10% of score
Does it work the whole area, and hold that between runs
  • iRobot Roomba j7+78
  • iRobot Roomba Plus 678 Combo68
0median 70 across 417 scored robots100
Edge-case recovery10% of score
Does it recover from the failures its category presents
  • iRobot Roomba j7+75
  • iRobot Roomba Plus 678 Combo55
18median 52 across 318 scored robots100
Operating envelope4% of score
How far conditions can vary before performance drops
  • iRobot Roomba j7+68
  • iRobot Roomba Plus 678 Combo60
28median 68 across 393 scored robots100

Dependability

Field failure rate16% of score
Documented hardware failures per owner-year
  • iRobot Roomba j7+80
  • iRobot Roomba Plus 678 Combo60
6median 70 across 355 scored robots100
Software stability14% of score
Whether updates fix more than they break
  • iRobot Roomba j7+100
  • iRobot Roomba Plus 678 Combo65
15median 65 across 340 scored robots100
Support longevity10% of score
Committed parts, service and updates, with dates
  • iRobot Roomba j7+58
  • iRobot Roomba Plus 678 Combo55
0median 62 across 425 scored robots100

Ownership burden

Routine maintenance12% of score
Hands-on time it asks for in normal operation
  • iRobot Roomba j7+91
  • iRobot Roomba Plus 678 Combo72
22median 67 across 430 scored robots100
Consumables8% of score
Parts that must be bought to keep it working
  • iRobot Roomba j7+66
  • iRobot Roomba Plus 678 Combo62
8median 69 across 430 scored robots100
03 Measured against the class

How far apart is a long way?

A number only means something next to the spread it sits in. Each track below is the real range across every classified robot in the class, with the median marked.

Price214 with a published figure
  • iRobot Roomba j7+$800
  • iRobot Roomba Plus 678 Combo$899
$160median $799.99$2,599
Suction (mode not stated)207 with a published figure
  • iRobot Roomba j7+1,700 Pa
  • iRobot Roomba Plus 678 Combo30,000 Pa
1,000 Pamedian 10,000 Pa42,000 Pa
Weight181 with a published figure
  • iRobot Roomba j7+7.5 lbs
  • iRobot Roomba Plus 678 Combo10.7 lbs
3.6 lbsmedian 8.5 lbs25 lbs
Height223 with a published figure
  • iRobot Roomba j7+3.4 in
  • iRobot Roomba Plus 678 Combo3.9 in
2.6 inmedian 3.8 in7.8 in

Not compared, because fewer than two of these robots carry a published figure: Runtime, Charge time, Noise.

04 Ownership

What the numbers leave out.

The trade-off

What each design gives up to be good at what it is good at.

iRobot Roomba j7+

PrecisionVision detection adds adaptability but cannot match human judgment on novel hazards or extremely dark obstacles.

Self-empty dock reduces hands-on maintenance but introduces monthly consumable costs and requires dedicated floor space.

iRobot Roomba Plus 678 Combo

The AutoWash dock hot-washes and heat-dries the roller mop and auto-empties the bin, but that is more moving parts in the dock than a dry-empty-only station, and none of it has independent long-term reliability data yet.

Undercuts the Max 875 Combo by roughly $300 with the same AutoWash dock architecture, but at lower rated suction (30,000 Pa), so the price gap likely tracks a real carpet-cleaning gap, not just branding.

Who each one is wrong for

Stated by the record itself. A robot being wrong for a household is a fact about fit, not a fault.

iRobot Roomba j7+
Homes with dark or transparent obstacles
PrecisionVision may miss dark power cords, pet bowls, or glass furniture. Owner reports confirm occasional collisions in low-light conditions.
High-pile carpet or textured thresholds
Brush design struggles with thick pile and loop transitions. Battery exhausts before covering planned areas efficiently.
Privacy-conscious users
Requires a WiFi connection and an iRobot Home account with persistent cloud connectivity. Camera imagery and map data are processed off-device per iRobot's privacy policy.
Frequently reconfigured floor plans
Remapping after major furniture rearrangement requires manual trigger and fresh app session. Not designed for daily layout changes.
Users avoiding consumable costs
The Clean Base takes disposable bags, and the filter and brushes are replaced periodically. This is a recurring supply line rather than a one-time purchase.
iRobot Roomba Plus 678 Combo
Homes with thick or high-pile carpet needing deep-clean suction
No independent suction or high-pile test results are documented for this model; iRobot's non-flagship Combo units have historically shown reduced pickup on thick carpet.
Buyers who want the Max tier's higher rated suction
The Plus 678 is rated at 30,000 Pa; the sibling Max 875 Combo carries a higher published suction figure, so serious carpet cleaning likely favors the pricier model.
Very large or multi-level homes needing single-pass coverage
Independent multi-level coverage testing does not yet exist for this model; recharge-and-resume adds passes rather than eliminating them on large floor plans.
Buyers who need proven multi-year reliability data before purchase
The model shipped twelve days before this assessment; no independent failure report, teardown, or owner-forum thread yet exists to evaluate the dock's hot-water wash mechanism or the robot itself.

What stays your job

The upkeep ownership hands back to you, whatever the autonomy level says.

iRobot Roomba j7+
  • After every run: Nothing required; the robot empties its bin into the Clean Base automatically.
  • Weekly: Tap out the filter, clear hair from the dual multi-surface brushes and side brush, wipe the cliff sensors and camera lens.
  • Every 2 months: Replace the filter. The filter housing is part of the bin structure, not a consumable.
  • When the app reports it: Replace the Clean Base bag. iRobot rates the base at up to 60 days of debris; shedding pets and heavy carpet shorten that.
  • When worn: Replace the dual multi-surface brushes and side brush. Wear shows as flattened rubber vanes or bent bristles rather than on a fixed calendar.
  • Annually: Inspect and clean the dock charging contacts.
iRobot Roomba Plus 678 Combo
  • Weekly: Check the StayClean mopping concentrate reservoir and refill if the dock signals low.
  • Monthly: Clear hair wrap from the main brush and roller.
  • Every 3-6 months: Replace the self-empty bag.
  • Every 3-6 months: Replace the filter (roughly $15-20 for a 3-pack at iRobot’s typical part pricing).
  • Every 3-6 months: Replace the side brush.
  • As needed: Run the dock’s self-clean cycle and wipe down the roller-wash chamber to prevent buildup.
05 Evidence

How much each of these is standing on.

Classifications rest on different depths of evidence. A pre-release assessment and a verified one are not the same kind of claim.

Evidence behind each classification
Robot Evidence status Sources reviewed Last assessed
iRobot Roomba j7+ Verified 14 Aug 2026
iRobot Roomba Plus 678 Combo Pending 7 Sep 2026

Robovations classifies robots; it does not rank them. Nothing on this page is a recommendation, and no manufacturer influences a classification or its placement here.