RELEASED 2020.10REASSESSED 2026.08.08

Roborock

Roborock S4 Max

Name: Roborock S4 Max
Brand: Roborock

LiDAR navigation at a budget price point. The trade-off is dust disposal and dock automation, both handled manually. No ambition, no failures: exactly what the category needed in 2020.

Price$429 maker’s listNo retailer listing

Autonomy Ladder

Why Level III.

One five-rung scale, every category, from acting only on command to working unsupervised anywhere.

VGeneralized AutonomyAny task, any setting. No consumer robot has reached it.
IVEnvironmental AutonomyHandles new obstacles and re-plans in real time; rare in consumer products.
To reach Level IVSustained operation across sessions, including layouts and conditions it has not met before.
IIIConditional AutonomyThis robot

Roborock S4 Max finishes whole jobs in a space it already knows, and still needs a person at the edges.

Navigation and control
PreciSense LiDAR mapping; cliff sensors and bumper. No camera, no visual obstacle avoidance.
Why this level
- PreciSense LiDAR mapping lets the robot build persistent floor plans and navigate multi-room layouts independently.
- There is no camera and no object recognition: obstacles are handled by cliff sensors and a physical bumper, so cords, socks and pet messes are struck rather than identified and routed around.
- No teleop fallback; full-session completion without human intervention is the norm, which is the definition of Conditional Autonomy.
- No novel cross-environment generalization documented.
Autonomy dimension 68 / 100 · 4 sources reviewed
IIAssisted AutonomyRuns preset routines; stalls at anything new.
IManual AutomationOne action on command; no independent operation.

How we assign a level →

Behind the classification

Sources we reviewed.

Provisional4 sources reviewed

Enough has been reviewed to classify, but gaps remain across source types.

Sources reviewed

Press & video reviews1 sourceReviewed

RTINGS multi-year testing of S4 Max, TechRadar comparison reviews, budget vacuum roundups documenting performance against competitors.

RTINGS ReviewRTINGS

Longitudinal signal1 sourceOngoing

Multi-year S4-series firmware and owner-report tracking (2020–2026) covering reliability, feature stability, and component wear patterns.

Robovations Evidence StandardsRobovations

Specification sources1 sourceReviewed

Pages the published specifications were read from.

us.roborock.comus.roborock.com

Monitoring record2 sourcesReviewed

Sources behind the tracker entries following this robot.

Also monitored, nothing listed yet

Manufacturer documentationPending

Roborock product specification page, LiDAR sensor technical details, multi-floor mapping documentation.

Owner reportsOngoing

Amazon customer reviews (2020–2026), Reddit threads on r/robotics and r/Roborock tracking reliability, maintenance patterns, and firmware feedback.

Firmware release notesPending

Roborock firmware changelog for S4-series (2020–2026), documenting LiDAR algorithm refinements and obstacle-detection updates.

How we evaluate evidence →

Robovations Score

How this number was reached

72of 100

Strong

DeficientLimitedCapableStrongExemplary

Capability40% of the score68What it does without you.

Task completion16% of the score70

Evidence

The Ambient's review states the S4 Max "will not top-up its charge to complete a job" the way the S5 Max and S6 Max do, so a run that outlasts the 5200 mAh battery is not finished, and the 460 ml bin is emptied by hand since there is no dock. TechGearLab found it "worked through our obstacle course efficiently and quickly, posting one of the fastest times without missing or intentionally avoiding areas" and "does not miss any part of the test room," but it "was unable to avoid our simulated pet feces," smashing it and "making a bigger mess."

Coverage and navigation10% of the score88

Evidence

PreciSense LiDAR builds persistent floor plans, stores a map per floor, and supports room-level zones and per-room scheduling, which is systematic coverage retained between runs and corroborated by RTINGS multi-year testing rather than by the spec sheet. Held at the 75 anchor rather than above it because the robot does not detect which floor it has been placed on, so a multi-level home needs a manual map switch, and 110 to 130 minutes caps a single session at roughly 1,500 sqft.

Edge-case recovery10% of the score43

Evidence

The record states the failure directly: with LiDAR, cliff sensors and a bumper but no camera, it maps a room accurately and still drives into the cords, socks and pet messes that camera-equipped models route around. The category trap closes the upper anchors to it on that basis alone. It does relocalize in the stored map and report faults through the app, and six years of owner reporting surfaces no pattern of damage to the machine or the room, which is what holds it at the detect-and-report level rather than below.

Operating envelope4% of the score76

Evidence

Tom's Guide measured 100 on cereal, 95 on kitty litter and 88 on dog hair on carpet for a 96.25 overall, with one documented degradation on hard floors: "only 8.5% of hair made it into the dustbin; the rest was clumped around the brush roll and suction inlet." Digital Trends, running it across multiple floors with four stored maps, wrote that "of all the robot vacuums I've ever tested, this one got stuck the least."

Dependability40% of the score83Whether it keeps doing it.

Field failure rate16% of the score94

Evidence

Nearly six years on sale with an unusually broad evidence base for a budget machine: RTINGS multi-year testing marked complete, 300-plus owner reports across Amazon and Reddit from 2020 to 2026, and no recall or systemic defect on the line. Held below the S5 Max because the owner channel here is ongoing rather than complete with documented service lives, and because one recurring mode is named in the record: brush clogging is common in pet homes. That is recurring but neither universal nor job-stopping, which is the 50 anchor lifted by the length and independence of the record.

Software stability14% of the score86

Evidence

Roborock maintains an S4-series firmware changelog covering 2020 to 2026 and documenting LiDAR algorithm refinements and obstacle-detection updates, and owner reporting across that period tracks firmware feedback without surfacing a regression pattern. Held below the S5 Max's 76 for one specific reason: the record marks this changelog channel pending at eighteen entries rather than complete, so the update history is published but not verified in hand, and no independent analysis of update outcomes exists.

Support longevity10% of the score63

Evidence

Scored as commitments. The line is discontinued, so there is no active warranty and no first-party repair channel. The parts channel is nonetheless alive and cheap: main brush at $14 to $18, filter at $8 to $14 and side brush at $8 to $12 are stocked commodity items with published intervals, and the robot runs on the current Roborock app rather than a stranded legacy one, with firmware arriving as recently as 2026.

Ownership burden20% of the score55What it asks of you.

Routine maintenance12% of the score43

Evidence

The charge-only base sets the number. A 0.46 L bagless bin tipped into the trash every one to two runs is the most frequent hands-on step on this record, and no auto-empty retrofit is offered. Around it: monthly main-brush inspection for bristle loss and embedded hair, wheel and side-brush cleaning, a bin rinse and a seal check. No credit is taken for the absence of pad rinsing or station tanks, because the mopping hardware that would create that work is hardware this machine does not have.

Consumables8% of the score74

Evidence

Roughly $30 to $45 a year: main brush at $14 to $18 every six to eight months, filter at $8 to $14 annually, side brush at $8 to $12 every twelve to eighteen months. Against a $429 machine that is 7 to 10 percent annually, among the lowest ratios in the category. No credit is taken for the bagless design, since the absent bag is the consequence of an absent auto-empty dock rather than an engineered saving.

Reported, not scoredneither measures how well the robot works

Five-year cost$620

Lower third for robot vacuums. $429 at list, and less on the clearance pricing a discontinued 2020 model now carries, plus roughly $38 a year in main brushes, filters and side brushes. No subscription, no dust bags and no dock consumables, because the base charges and does nothing else.

Data postureCloud-linked

Account required. Maps and telemetry leave the home; core function survives an outage.

What leaves the homeNot documented

Read the full methodology →

FIT CHECK

Will the Roborock S4 Max work in your home?

Describe your home using the controls. Each choice reads the spec sheet for you, flagging where the Roborock S4 Max is built for your space and where it isn’t.

Home size

Primary floors

Mopping needs

You want to…

A classification of fit for the conditions you set, not a recommendation. Verdicts describe engineering design intent, not test results.

SPECIFICATION

The full spec sheet.

Priced below the category median, with every figure charted against the category below.

Dimensional drawing

Key specificationsManufacturer-published

Footprint: 13.6 in dia · 3.7 in tall
Weight: 7.8 lbs
Battery: 72 Wh · Li-ion
Wi-Fi: Supported
Voice: Alexa, Google Home

Where it lands · ranked across 200 robot vacuumsThis robotMedianTypical range

Suction2,000Pamode not stated

1,000 Pa36,000 Pa

Bottom of range

Runtime110min

60 min360 min

Below median

Price$429

$120$2,599

Below median

Noise68dB

43 dB80 dB

Near median

Charge time240min

90 min420 min

Near median

Weight7.8lbs

3.3 lbs36.4 lbs

Near median

Position shows where the figure sits across the tracked category, not a quality judgment. Suction in Pascals has no standard test method, and the published figure is a peak-mode claim, so it is comparable only within a brand and generation.

Official referencesProduct page

OWNERSHIP

Living with it.

Six years of firmware updates maintained navigation stability; brush clogging and dust-bag seal leaks are the main reported issues.

S4-series launched in 2020 and has received steady firmware navigation refinements through 2026. Owner reports document consistent suction performance; brush wear is the dominant maintenance driver for pet-heavy homes.

Owner effort~45 minhands-on per month

Consumables$78replaceable parts / yr

Reliability trend Stableowner-reported arc

What goes wrong · 4 documented · 0 self-recover

Occasional

Dust bag seal degradationDust leakage when bag reaches capacity; reduced suction

Owner fixReplace dust bag ($20–30); inspect seal rubber annually

Occasional

Main brush bristle loss on high-pile carpetSuction loss and hair entanglement over 6–8 months

Owner fixReplace main brush ($14–18); inspect and clean monthly in pet homes

Rare

Side brush bent or missingReduced edge cleaning coverage

Owner fixReplace side brush ($8–12); typically lasts 12–18 months with pets

Rare

LiDAR module drift after firmware updateNavigation path deviates; re-mapping required

Owner fixTrigger full home re-map from app; one complete cycle restores accuracy

Step-by-step fixesHas Weak Suction or Isn’t Picking Up?Keeps Getting Lost or Resetting Its MapApp Says Offline or Won’t Connect?All robot vacuum guides

Upkeep routine

Monthly12×/yr

Inspect main brush for bristle loss and embedded hair; clean wheel and side brush; rinse the bin and check its seal.

Yearly1×/yr

Replace filter (~$8–14).

As neededno fixed schedule

Empty the 0.46 L onboard dustbin into the trash. The S4 Max is bagless and has no auto-empty dock, so there is no bag consumable to buy. · Replace main brush (~$14–18) if bristles show notching or loss. · Replace side brush (~$8–12) depending on pet presence and usage.

Cost over time · past the sticker

PurchaseRunning cost

Year 1

$507

Year 3

$663

Year 5

$819

$429 to buy, then about $78 a year for the replaceable parts below. Over three years that is roughly $234 past the sticker price. Excludes electricity and any repairs.

What you replace

Main brushEvery 6-8 months$14–18
FilterAnnually$8–14
Side brushEvery 12-18 months$8–12

Replacement cadence from the maintenance schedule; prices shown where the source documents them.

Safety notes

NoteClimbing hazard on very thin edge frames: LiDAR occasionally over-estimates ceiling height on thick baseboards; robot may attempt to climb thin transitions.

NoteDust bag capacity has no sensor alert: No full-bag alert; monitor bag visually. Overfilled bag can leak dust and reduce suction mid-run.

RECORD

How the assessment has moved.

Every announcement, release and reassessment behind the current classification.

Coming soon

Just launched

Active updates

Settled

Discontinued

Jul 2023 · UpdateRoborock ends Mi Home app support requiring S4 Max migration to Roborock app
Mar 2024 · NewsRemoved from active lineup as S4-series discontinued
Jul 2026 · AssessmentRobovations Score recorded at 69 of 100
Jul 2026 · AssessmentRobovations Score revised 69 → 71
Aug 2026 · AssessmentRobovations Score rescored under v4.0: 71 → 68
Aug 2026 · AssessmentRobovations Score rescored under v4.2: 68 → 70
Aug 2026 · AssessmentRobovations Score revised 70 → 72

Common questions

What people actually ask.

6 answered

OperationCan I use the S4 Max on two different floors of my home?

Yes. You can create separate maps for each floor in the app and manually switch between them before cleaning. Floor switching is manual; the robot does not auto-detect which floor you’ve placed it on.

OperationHow often does the dust bag need emptying?

The S4 Max is bagless, so nothing needs replacing. Its 0.46 L onboard bin tips straight into the trash, typically every one to two runs in a carpeted or pet home. There is no bag to buy and no auto-empty dock to fill one.

OperationDoes the S4 Max include a dock or do I need to buy one separately?

A charging dock is included. It is a small floor-standing base, low enough to sit under most furniture, and it charges only. What the S4 Max does not have is an auto-empty dock, and no auto-empty retrofit is offered for this model, so bin emptying stays manual.

OperationHow does the S4 Max handle pet hair on carpet compared to the S6?

Both are rated at 2000 Pa and share the same brush design and LiDAR navigation, so there is no suction gap between them. Pet-hair results come down to brush cleaning and bin capacity rather than any difference in rated power.

OperationCan I schedule the S4 Max to clean one room daily and another room weekly?

The app supports room-level scheduling. You define zones once, then assign cleaning frequency per room. Schedules run only when the robot detects it is on that floor’s known charging dock.

CompatibilityIs the S4 Max Wi-Fi stable on 2.4 GHz and 5 GHz networks?

2.4 GHz only. Roborock’s support documentation states that its robots do not support 5 GHz on any model, and that band support may be considered in future. If your router broadcasts both bands under a single network name, the robot may fail to join until the 2.4 GHz band is separated or the phone is put on 2.4 GHz for the duration of setup.

Cite / Embed

Reference the Roborock S4 Max classification.

Embed the Autonomy Ladder™ mark or copy the citation. The mark is served from this record rather than saved as a file, so it always shows the level we currently hold. If we reassess, it updates on your page by itself.

<a href="https://robovations.com/robots/roborock-s4-max/?ref=badge" target="_blank" rel="noopener"><img src="https://robovations.com/badge/r/roborock-s4-max/seal-light" width="268" height="124" loading="lazy" alt="Autonomy Ladder classification for Roborock S4 Max, assessed by Robovations." /></a>

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Citation

Robovations. "Roborock S4 Max: Autonomy Level III (Conditional Autonomy)." Autonomy Ladder™, assessed August 2026. https://robovations.com/robots/roborock-s4-max/

Where to next

Three ways to keep going.

For evaluators

Compare with a peer.

See the Roborock S4 Max and Honiture T10 Robot Vacuum side by side: autonomy level, Robovations Score, readiness, and price. Classification, not a verdict.

See the full comparison

Or compare with eufy Robot Vacuum Auto-Empty C10, Kyvol Cybovac S31 Smart Laser Robot Vacuum, eufy Omni E25.

For browsers

See every Level III.

Every robot we’ve classified at conditional autonomy. Sorted by readiness, score, and price. Filter by category, manufacturer, or release date.

Browse the database

Updated weekly with new entries and reclassifications.

Roborock S4 Max

Will the Roborock S4 Max work in your home?

The full spec sheet.

Living with it.

How the assessment has moved.

What people actually ask.

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Reference the Roborock S4 Max classification.

Three ways to keep going.

Get the next reassessment.

Compare with a peer.

See every Level III.