RELEASED 2021.10REASSESSED 2026.09.06

HOBOT

HOBOT 2S

Name: HOBOT 2S
Brand: HOBOT

Edge detection and suction adhesion handle window-to-window navigation once positioned. Manual placement is the autonomy ceiling. Reliable within that constraint.

Autonomy Ladder

Why Level II.

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 AutonomyCopes with everyday clutter and frees itself, shown by independent testing.
IIIConditional AutonomyFinishes whole jobs in familiar spaces; struggles at the edges.
To reach Level IIIMost sessions finish without intervention. Rescue is occasional, not routine.
IIAssisted AutonomyThis robot

HOBOT 2S runs preset routines on its own, and the owner is its recovery system.
What it does on its own
- Edge-Leakage Sensor detects the air leak at a pane edge, on framed and frameless glass alike, and turns the unit before it runs off
- Preprogrammed zigzag route: horizontal passes first, then vertical
- Dual ultrasonic spray nozzles fed from a single water tank module
- Vacuum motor holds the unit on the glass, with an auto-adjustable pneumatic pad balancing driving force against the treads; HOBOT publishes a 7 kg ascending power figure
- Onboard uninterruptible power system holds the unit in position for 20 minutes with an audio alert if mains power is lost
Why this level
- Classified at Level II because manual repositioning prevents autonomous multi-window operation.
- Once positioned, the Edge-Leakage Sensor keeps the unit on the pane by detecting the air leak at a seal or a frameless edge, and a preprogrammed zigzag route covers the glass without owner steering.
- No decision-making capability between task segments.
What holds it at Level II
- Cannot detect or navigate between windows independently; manual placement required.
- The Edge-Leakage Sensor registers the air leak at a pane edge, on framed and frameless glass alike, but only once the unit has reached that edge; the machine holds no model of the window it is on.
- No unattended multi-pane routine; every pane is started by the owner from the unit, the remote or the app.
- Cannot assess window cleanliness or determine optimal pad pressure; owner adjusts manually.
Autonomy dimension 38 / 100 · 4 sources reviewed
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

Manufacturer documentation1 sourceReviewed

HOBOT's product page for the 2S: mains power and 5 m cord, UPS hold-up behavior, safety rope length and pulling-force rating, Edge-Leakage Sensor, ascending power, dual ultrasonic spray and the single tank module, app and remote control, over-the-air firmware.

HOBOT 2S product pageHOBOT

Longitudinal signal2 sourcesReviewed

Robovations dated log for this robot: 3 tracked entries spanning ~23 months.

Specification sources1 sourceReviewed

Pages the published specifications were read from.

hobot.ushobot.us

Monitoring record2 sourcesReviewed

Sources behind the tracker entries following this robot.

Also monitored, nothing listed yet

Press & video reviewsPending

Tech publication hands-on evaluation and performance testing. TechRadar unboxing and multi-window trial.

How we evaluate evidence →

Human Readiness

Ready Now.

One question: what does buying this robot today walk you into? The state is computed from the record, and recomputed daily.

Ready NowThis robot

HOBOT 2S is on sale, assessed, and nothing on its record argues for waiting.
How this was derived
- Shipping past the first-90-day ownership window with a published assessment, no documented issues on record, and no announced successor.
Notes on the record
- Commercially available through major retailers at consumer-accessible pricing.
- Setup is straightforward but has a fixed order: tie the safety rope to a fixed object indoors, fill the water tank, route the 5 m power cord, then place the unit on the glass.
- Ongoing effort centers on manual repositioning between windows and pad maintenance.
On the record
- Shipping since October 2021 · 59 months on the market
- Retail listings on file: Amazon
- No successor announced
- 4 sources reviewed
What would move it
A documented problem, an announced successor, or a withdrawn listing moves it out; the rating recomputes daily.
New to MarketOn sale under 90 days; the ownership record is still forming.
WaitA successor is announced and has not shipped; re-read the decision when it arrives.
Known IssuesDocumented problems stand on the record; read the case before buying.

How we assess readiness →

Robovations Score

How this number was reached

51of 100

LimitedAt or above 8% of the 432 robots we scoreand 19% of the 21 scored robot window cleaners

DeficientLimitedCapableStrongExemplary

What moved itpoints gained or lost against a typical robot

Held back by

Routine maintenance28−4.7
Coverage and navigation45−2.5
Field failure rate56−2.2

Capability40% of the score48What it does without you.

Task completion16% of the score60

Evidence

GadgetGuy's hands-on found it cleans a pane in two passes with the pads covering right up to the edges, and that 'at the end of a clean, the robot returns to its original placement' and signals by app and voice prompt. The same review is explicit that a human is in the loop for every pane: 'don't leave it unattended. When the robot finishes each window, it emits a tone and stops moving. At which time you move it to the next window.'

Coverage and navigation10% of the score45

Evidence

The owner account on ProductReview.com.au describes repeated incomplete passes on the same panes: 'Sometimes the 2S would stop half way up cleaning a window, then turn and go over an area it had already attempted to clean. It would omit cleaning the top of the window.' That is a missed region plus redundant re-covering, so it sits below the complete-but-inefficient anchor.

Edge-case recovery10% of the score30

Evidence

The ProductReview.com.au owner reports the 2S 'would become fixed in a spot' and that 'we would have to stop the 2S and start again', and that it wedged itself under a glass door handle more than once, each time needing a full restart. It stays attached rather than falling, and the owner could always retrieve it, but it does not free itself and does not resume.

Operating envelope4% of the score55

Evidence

GadgetGuy measured the vacuum at the equivalent of 6.5 kg of downward force and concluded 'it works on all but very thin glass', tested it on large mirrored cupboards where it 'performed flawlessly', and found the spray insufficient to wet ceramic floor tiles. Buyers commenting on that same review report it stopping repeatedly and needing constant supervision, so the workable setting is clean, framed household glass rather than any vertical surface.

Dependability40% of the score57Whether it keeps doing it.

Field failure rate16% of the score56

Evidence

Nearly five years on sale with no recall, but a job-stopping mode is documented rather than absent: suction motor durability is named as the limiting factor and vacuum failure is the most commonly reported issue after 100 or more cleaning sessions, with the unit falling off the glass as the consequence. It is neither universal nor unavoidable, since owner reports tie it to intake clogging after 50 or more sessions without maintenance, and weekly intake inspection prevents it. The record establishes no orderable replacement motor. Evidence is owner forum aggregate plus one TechRadar hands-on, so it sits under the retail-review ceiling.

Software stability14% of the score65

Evidence

Updates ship: HOBOT documents over-the-air firmware updates and a cleaning reminder pushed every three months through the iOS and Android app, so this is not an offline appliance and the channel is demonstrably used. Their effect is unrecorded. No changelog, no release history and no independent account of what any update changed or broke exists, and no owner reports one breaking a working function. The record's own line that firmware updates have been minimal, suggesting software stability, remains the inference the rubric forbids, and it is not what carries this number: the number reflects a channel that ships and a record that says nothing in either direction.

Support longevity10% of the score48

Evidence

Scored as commitments. A current model in active distribution through major retailers with a live HOBOT support page, replacement microfiber pads sold by the manufacturer, and a water tank that is a single module replaced with one screw, which is a genuinely serviceable design. Against that, no parts-availability window, no end-of-support date and no update commitment covering the service life is published, and the part most likely to fail, the vacuum motor, has no documented orderable replacement.

Ownership burden20% of the score43What it asks of you.

Routine maintenance12% of the score28

Evidence

Heavy and safety-critical. Before every use: run the 4.5 m safety rope through your hands along its full length, check both end fittings, confirm the indoor anchor is fixed, and inspect the permanently attached power cord for nicks and crushing. After every use: remove, wring and fully dry the pads. Weekly under heavy use: brush the vacuum motor intake for dust clogs, which is the load-bearing item because skipping it is what precedes a fall. Every two to four weeks the sealing ring, monthly a vinegar flush of the nozzles. On top of that sits per-pane placement, rope re-anchoring, cord routing and off-glass tank refills.

Consumables8% of the score66

Evidence

Pads at roughly $20 to $30 a pair replaced on condition when matted or thinning, with the app pushing a three-month prompt to check them, plus vinegar and distilled water for nozzle care. The water tank is a replaceable one-screw module rather than a recurring cost. That lands near $75 to $100 a year against a $299 to $349 machine, which is proportionate and single-item; nothing else recurs on a schedule.

middle half of the databaseits medianthis robot

Reported, not scoredneither measures how well the robot works

Five-year cost$850

Middle of the range for window cleaners, above the sub-$200 machines and below the flagship Winbots. Roughly $325 at street pricing plus about $100 a year in pads, vinegar and distilled water, and a replacement safety rope across five years. No subscription. Not included and worth naming: the vacuum motor is the documented limiting component and no replacement part or price is published, so a failure at 100-plus sessions has no costed repair path.

Data postureCloud-optional

Full core function without an account; cloud adds convenience.

What leaves the homeDocumented

The HOBOT 2S is controlled from the buttons on the unit, from the remote control supplied in the box, and from the HOBOT app for iOS and Android. HOBOT documents over-the-air firmware updates, a cleaning reminder pushed every three months, and a voice prompt the owner can replace from the app, so this is not an offline appliance. What the app and the update channel collect, where it is held and for how long has not been examined, and HOBOT's disclosures for this model have not been reviewed. The privacy position should be read as unassessed rather than clean.

On-device processingNo

Read the full methodology →

FIT CHECK

Will the HOBOT 2S work on your windows?

Describe your windows using the controls. Each choice reads the spec sheet for you, flagging where the HOBOT 2S is built for your space and where it isn’t.

Window style

Frame style

Building height

Power preference

See every window cleaner suited to these conditions

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

Dimensional drawing

Key specificationsManufacturer-published

Footprint: 9.45 × 9.45 in · 3.39 in tall•
Weight: 2.87 lbs•
Cleaning width: 9.4 in•
Backup battery runtime: 20 min•
Power type: Mains-corded, 5 m cord•
Safety rope rating: 331 lb•
Min pane size: 15.7 in•

Where it lands · ranked across 27 robot window cleanersThis robotMedianTypical range

Price$349

$150$850

Near median

Noise64dB

63 dB75 dB

Bottom of range

Weight2.87lbs

1.3 lbs4.8 lbs

Near median

Position shows where the figure sits across the tracked category, not a quality judgment.

Official referencesManufacturer support Product page

OWNERSHIP

Living with it.

Suction motor durability limits service life; maintenance-preventable pad and intake failures dominate reports.

Stable performance over 12-18 months with consistent owners; suction failure is most common issue after 100+ sessions without maintenance. Firmware updates minimal, indicating software stability.

Owner effort~25 minhands-on per month

Consumables$90replaceable parts / yr

Reliability trend Stableowner-reported arc

What goes wrong · 4 documented · 0 self-recover

Occasional

Suction loss mid-sessionMotor intake clogs, unit falls

Owner fixClear intake filter, restart session

Occasional

Microfiber pad degradationMineral deposits cause streaking

Owner fixReplace pads every 3-6 months

Occasional

Edge detection false positiveReflective windows trigger premature stop

Owner fixManual repositioning needed

Rare

Water channel blockageMineral buildup reduces spray flow

Owner fixVinegar solution cleans nozzles

Upkeep routine

Each useEvery cycle

Run the safety rope through your hands along its full length and check both end fittings; replace it if any strands are cut, frayed or abraded. Confirm the indoor anchor is a fixed object that will not move under load. · Inspect the permanently attached power cord for nicks, crushing or exposed conductors along its length. · Remove and wring the microfiber pads, then dry them fully before storage.

Weekly52×/yr

Inspect vacuum motor intake for dust clogs with a soft brush.

Monthly12×/yr

Check the rubber sealing ring for hair or debris; clean with a damp cloth. · Run a vinegar solution through the ultrasonic spray nozzles to clear mineral buildup.

As neededno fixed schedule

Replace microfiber pads when matted or thinning (approximately $20-30 per pair). The water tank is a single module, replaced with one screw.

Cost over time · past the sticker

PurchaseRunning cost

Year 1

$439

Year 3

$619

Year 5

$799

$349 to buy, then about $90 a year for the replaceable parts below. Over three years that is roughly $270 past the sticker price. Excludes electricity and any repairs.

What you replace

Mop padBy condition$20–30

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

Safety notes

NoteFall prevention: Safety rope prevents falls if vacuum fails completely

CautionSuction pinch hazard: 2000Pa pressure can pinch fingers if contacted while active

CautionFall risk if unsecured: Rope must be secured per manual; unattended windows increase severity

RECORD

How the assessment has moved.

Every announcement, release and reassessment behind the current classification.

Coming soon

Just launched

Active updates

Settled

Discontinued

Sep 2026 · AssessmentRecord status: Verified → Provisional
Aug 2026 · AssessmentRobovations Score revised 52 → 51
Aug 2026 · AssessmentRobovations Score revised 61 → 52
Aug 2026 · AssessmentRobovations Score rescored under v4.2: 58 → 61
Aug 2026 · AssessmentRobovations Score rescored under v4.0: 62 → 58
Jul 2026 · AssessmentRobovations Score revised 61 → 62
Jul 2026 · AssessmentRobovations Score revised 69 → 61
Apr 2026 · AssessmentRobovations Score recorded at 69 of 100
Sep 2021 · AnnouncementHOBOT-2S window cleaning robot unveiled ahead of October 2021 US launch

Editorial comparisons

Common questions

What people actually ask.

6 answered

OperationHow does it stay attached to the glass?

A vacuum motor holds it against the pane, with an auto-adjustable pneumatic pad balancing driving force against the treads. HOBOT publishes a 7 kg ascending power figure for moving up and down without skidding, and does not publish a Pascal rating for the 2S. Adhesion is not the whole story: HOBOT requires the 4.5 m safety rope to be tied to a fixed object indoors before every run, and the machine is mains powered on a permanently attached 5 m cord.

OperationCan I start it and walk away?

It cleans a pane on its own once placed and started, and it can be stopped or steered from the bundled remote control or the HOBOT app. It will not move to the next window: each pane is a separate placement, with the rope re-anchored indoors each time.

OperationDo I need to pre-clean windows?

Heavily soiled glass requires rinsing first. Owner reports indicate dusty windows reduce water flow and leave streaks. Light dirt is acceptable.

OwnershipHow often do pads need replacement?

Pads are replaced on condition rather than on a schedule: once the microfiber is matted, thinning or no longer wiping cleanly, it is due. Replacement pads cost approximately $20-30 per pair. HOBOT’s app pushes a cleaning reminder every three months, which is a useful prompt to check them.

OperationWhat happens if power is lost or adhesion fails mid-session?

On a power outage the onboard uninterruptible power system keeps the unit in position on the glass for 20 minutes with an audio alert. It holds; it does not park itself and it does not come down, so the owner retrieves it within that window. If adhesion is lost, the safety rope is what stops the fall, which is why HOBOT makes anchoring it to a fixed object indoors a step before every run.

OperationDoes it work on textured or frosted glass?

No. Textured surfaces break the suction seal. Manufacturer and owner reports confirm poor performance on frosted or heavily textured finishes.

Availability

Where it's sold

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Cite / Embed

Reference the HOBOT 2S classification.

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Citation

Robovations. "HOBOT 2S: Autonomy Level II (Assisted Autonomy)." Autonomy Ladder™, assessed September 2026. https://robovations.com/robots/hobot-2s-window-cleaning-robot/

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Where to next

Three ways to keep going.

For evaluators

Compare with a peer.

See the HOBOT 2S and Ecovacs Winbot 920 side by side: autonomy level, Robovations Score, readiness, and price. Classification, not a verdict.

See the full comparison

Or compare with HUTT C6, Hobot R3, HOBOT 388 Ultrasonic.

For browsers

See every Level II.

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

Browse the database

Updated weekly with new entries and reclassifications.

HOBOT 2S

Will the HOBOT 2S work on your windows?

The full spec sheet.

Living with it.

How the assessment has moved.

How HOBOT 2S compares.

Are robot window cleaners worth it for just a few windows?

Complete coverage or skipped strips: which window robot finishes the pane?

Robotic window cleaners: which can you trust on a third-floor pane?

What people actually ask.

HOBOT 2S in the analysis archive.

Are robot window cleaners safe? How anti-fall tethers and backup power work

How do robot window cleaners stay on the glass without falling?

Other robot window cleaners we have classified.

Kärcher RCW 4

Kärcher RCW 2

Ecovacs Winbot W2S Pro Omni

Tosima W5 Window Cleaning Robot

Where it's sold

Reference the HOBOT 2S classification.

Three ways to keep going.

Get the next reassessment.

Compare with a peer.

See every Level II.