LG CordZero R9 ThinQ Review

Key Takeaways: The LG CordZero R9 ThinQ looks unlike anything else in this review series: a round robot body with what resembles a stick-vacuum power nozzle attached to the front. It offers a genuinely wide range of cleaning modes, Cell by Cell, Spot, My Space, Turbo, Smart Turbo, Repeat, and Zigzag, plus HomeView, which streams live video to your phone, and HomeGuard, which detects motion and sends photo alerts. Independent testing found overall cleaning ability impressive but specifically flagged weak edge cleaning, a direct result of having no side brush. Price is $1,200. Buy it if the home-monitoring features and cleaning-mode flexibility appeal to you and you can accept it leaving dirt along your baseboards.

LG is better known for appliances than robot vacuums, and the CordZero R9 ThinQ shows both the benefit and the cost of that outsider perspective: genuinely novel ideas borrowed from other product categories, alongside a basic omission that a robot-vacuum specialist likely would not have made.

Every figure below is from LG’s published specifications and independent testing. Sources are at the end, and nothing is estimated or invented.

Specifications

Who It Is For

LG smart-home households. Native ThinQ integration is the clearest reason to choose this over a robot-vacuum specialist, if you already manage other LG appliances through the same app.

People who want home-monitoring features baked into their robot. HomeView’s live video streaming and HomeGuard’s motion-detection photo alerts turn the robot into a functional roaming camera, similar in spirit to the pet-monitoring feature on Roborock’s Saros 20, but framed here more broadly as general home security.

Buyers who want granular cleaning-mode control. Seven distinct modes, from cell-by-cell precision to a dedicated spot mode, offer more manual control than many robots provide, useful if you like to direct specific cleaning approaches yourself.

People whose homes have relatively few tight corners or baseboard-heavy layouts. If edge cleaning is less critical in your specific floor plan, this weakness matters less.

Who Should Skip It

• You care about edge and baseboard cleaning. This is the clear, documented weakness: no side brush means debris along walls and in corners is more likely to be left behind than with almost any competitor in this series. See do robot vacuums clean corners and edges.
• You want the deepest robot-vacuum-specific track record. LG is a newer, more occasional entrant to this specific category compared with dedicated robot-vacuum brands.
• You want the most polished, purpose-built robot-vacuum app. ThinQ is built to manage LG’s entire appliance range, not specialized purely around robot vacuum cleaning the way Roborock’s or Dreame’s apps are.
• Budget matters and edge cleaning is a priority. At $1,200, this competes directly with robots that include a side brush and score well on edge cleaning at similar or lower prices.

What It Is Actually Like to Live With

The overall impression from testers is genuinely positive on raw cleaning ability, this is not a robot that struggles with open floor areas. The unusual power-nozzle-style front end is described as effective at agitating and lifting debris in the middle of a room, closer in feel to a stick vacuum’s cleaning head than a typical robot’s brushroll.

Where the experience consistently disappoints, though, is at the walls. Without a side brush, there is no mechanism specifically designed to sweep debris out of corners and along baseboards into the main cleaning path, and testers noted this gap directly in scored results. In daily life, this shows up as a floor that looks clean in open areas but accumulates a visible line of dust and debris along the edges over repeated runs, the kind of thing you eventually notice and end up sweeping by hand.

The home-monitoring features are described as functioning well and genuinely adding value beyond cleaning, HomeView and HomeGuard turn the robot into a legitimate secondary security tool while it is docked or between runs, a feature set not many competitors package in quite the same way.

Navigation and Obstacle Avoidance

Seven cleaning modes give unusually granular manual control over how the robot approaches a space, though this is a different kind of flexibility than a large automatic obstacle-recognition library. Specific published obstacle-avoidance figures were more limited in available reporting than for the leading flagships in this series. If a map ever becomes unstable, see robot vacuum map keeps disappearing.

Cleaning Performance

• Open floor areas: impressive overall cleaning ability per independent testing.
• Edges and corners: the clear, documented weak point, a direct consequence of the missing side brush.
• Mode flexibility: seven distinct modes offer more manual control than most competitors provide.

The Dock

Standard dock functionality applies; general care principles are in how to clean a self-emptying robot vacuum dock.

Running Costs

Filters, the main brush, and dust bags if equipped, roughly $60 to $120 a year, though the missing side brush means one less consumable to replace over time. See robot vacuum maintenance schedule.

How It Compares

• vs any competitor with a side brush: nearly every other robot in this series includes a side brush specifically to solve the edge-cleaning problem this model struggles with. See best robot vacuums for hardwood and area rugs for options that handle edges well.
• vs Samsung’s Jet Bot lineup: both are major appliance brands newer to serious robot-vacuum competition, each with their own specific rough edges to weigh. See samsung jet bot ai plus review.
• vs Roborock Saros 20: both offer home-monitoring style camera features, though the Saros 20 frames it around pet monitoring specifically rather than general home security. See roborock saros 20 review.

The honest take: the home-monitoring features and cleaning-mode flexibility are genuinely interesting, and the open-floor cleaning is legitimately strong. But skipping a side brush is a basic, structural omission in a category where edge cleaning is a core expectation, and it shows up clearly in independent testing. Weigh that trade-off seriously before paying $1,200.

FAQs

Does the LG CordZero R9 ThinQ have a side brush?

No, and this is its clearest documented weakness. Independent testing found edge cleaning suffered specifically because of the missing side brush, leaving more debris along walls and in corners than most competitors.

What is HomeView on the LG CordZero R9 ThinQ?

A feature that streams live video from the robot to your smartphone, letting you check in on your home remotely, similar in concept to pet-monitoring camera features on other robots but framed more broadly here.

How many cleaning modes does the LG CordZero R9 ThinQ have?

Seven: Cell by Cell, Spot, My Space, Turbo, Smart Turbo, Repeat, and Zigzag, offering more granular manual control than many competitors provide.

Is the LG CordZero R9 ThinQ good at cleaning corners?

No, this is its main weakness. Without a side brush, testers found it consistently leaves more debris along edges and in corners compared with robots designed with dedicated edge-cleaning hardware.

Is the LG CordZero R9 ThinQ worth it?

It is worth considering if the HomeView and HomeGuard home-monitoring features and its flexible cleaning modes appeal to you specifically, and you are prepared to supplement its edge cleaning with occasional manual sweeping or a different tool along your baseboards.

The Bottom Line

The LG CordZero R9 ThinQ brings genuinely novel ideas to the category: a power-nozzle-style cleaning head, granular manual cleaning modes, and real home-monitoring features via HomeView and HomeGuard. Its clear, documented flaw is skipping a side brush entirely, which independent testing confirmed leaves edges and corners under-cleaned. At $1,200, weigh the unique features carefully against a weakness that most competitors solved long ago.

Sources:

• LG official CordZero R9 ThinQ product page
• Digital Trends: LG CordZero ThinQ robot vacuum review
• Consumer Reports: LG CordZero ThinQ R975GM review

List price $1,200; verify current pricing before buying.