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The Roborock S4 robot vacuum was pitched to me as a refreshed model with an updated design and an all-new app. Given that Roborock’s models S5 and S6 were two of the better robot vacuums I’ve used, that was bittersweet news. Experience has taught me that too much tinkering can just as easily spoil a maturing product as improve it. But my fears proved to be unfounded.

For the most part, the Roborock’s updated design is nothing dramatic. Both the laser turret and the hinge for the top lid have been moved closer to one end of the vacuum, and the power button has been reshaped and repositioned to the other end. The removable rubber-and-bristle roller brush and silicone-strip side brush that were introduced with the S6 are still present, though, as is the 0.6-liter dustbin located under the lid.

The most glaring change is that the mopping function, a feature of all prior Roborock vacuums, has been eliminated. That means you won’t find a water tank, mopping cloths, or a moisture-proof mat in the box. Roborock says it’s also made tweaks to the LIDAR navigation, so the robot vacuum can better maneuver around furniture and other obstacles, and refreshed its drivetrain to prioritize reverse power, allowing the S4 to back away from obstacles that would trap other robots.

s4 s3 Roborock

The Roborok S4 has improved navigation and a refreshed drivetrain to better maneuver around furniture.

A brand-new Roborock app replaces the Mi Home app used to operate the brand’s previous robot vacuums, and I was impressed with it right away. A giant plus sign, marked “add a device,” appeared the first time I logged in; and when I pressed it, it scanned for the S4, which it found instantly, prompting me to log in to my Wi-Fi network. That whole process took merely seconds, but the firmware update I had to install tacked on another five minutes.

The first time you run the S4, it creates a map of your floor plan (this function must be activated in the app prior to running the vacuum), and it automatically partitions the map into zones. In my case, the living room, kitchen, entryway and bathroom comprising my downstairs level were clearly delineated as separate rooms. After this initial recon vacuuming, the app loads the map each time you start a cleaning job. You can then opt to clean the entire floor plan, only specific rooms, or designate zones that you’ve defined in the app. In any of these cases, the S4 plots the most efficient path through the area, resulting in quicker cleaning times and more bang per battery charge.

It’s hard to tell how much the LIDAR adjustments Roborock made have improved the bot’s navigation. The S5 and S6 both maneuvered around obstacles and over different floor surfaces very well, and the S4 does, too. It cruised seamlessly over carpet, hardwood, and linoleum in my testing, never getting hung up on the transitions in between. Also like its predecessors, however, the S4 was too tall to get under my couch and kitchen cabinets thanks to its turret, so those areas always required more attention during deeper cleanings with my stand-up vacuum. The S4 didn’t get stuck often, but on the rare occasions it did, I was alerted to the specific problem by the vacuum’s voice system and a notification in the app.

s4 s4 Roborock

The Roborock S4 has four cleaning modes with increasingly high suction.

The S4 has four cleaning modes with increasingly high suction: Silent, Standard, Medium, and Turbo. Standard seemed to offer the best balance of power and battery efficiency, but you can change modes in the app as the vacuum is cleaning.

The app

The Roborock app might be better described as “rebranded,” rather than “brand new,” because the layout and functionality look nearly identical to the Mi Home app the company’s robot vacuum’s used previously. The floor map displays in the center of the screen. Real-time data on the size of the area cleaned, battery level, and cleaning duration run above the map; and buttons for starting/pausing cleaning jobs, and sending the S4 back to its dock are below that.

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