Comparing 2 robot vacuums
Your shortlist side by side: today’s price, our score and every fact the maker states.
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- Highest score
- Best on the most facts
Roborock Saros 20 FlowOn the market since September 2026
$1,699Roborock (brand store)
Best on 4 facts
Prices updated at 4:45 AM ETTest results read on Sep 9 to Oct 17
Side by side
Green is the best of these 2, also when they share the lead.
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|---|---|---|
| The facts that decide most | ||
| The lowest price today at a store that ships to you, shipping included. A price with an asterisk comes from a store abroad, and its shipping cost is our own estimate. Lowest price | – | $1,699Roborock (brand store) |
| Our own score out of 10: 60% test-site results, 25% store ratings and 15% the maker’s facts. Price does not count. Score | not in our ranking | |
| Suction in pascal, as the maker measures it. More pascal helps on carpet, but it says little about how well the robot picks grit off a hard floor. In this comparisonWhen it matters
When it matters less
Source
| 20,000 Pa | 36,000 Pa best |
| How long the robot cleans on one charge, at its quietest setting. After that it recharges and carries on where it stopped. In this comparisonWhen it matters
When it matters less
Source
| 120 min | 301 min best |
| The highest threshold the robot takes, as the maker states it. Measure your own: the step into a bathroom or onto a balcony is often higher. When it matters
When it matters less
Source
| – | 1.8 in (45 mm) |
| How tall the robot is. It decides whether it fits under your sofa, bed or cabinet. In this comparisonWhen it matters
When it matters less
Source
| 3.3 in (8.5 cm) best | 3.5 in (9 cm) |
| How far the robot lifts the mop when it drives onto a carpet. From about 0.4 in (10 mm) a medium pile stays dry. When it matters
When it matters less
Source
| – | 0.6 in (15 mm) |
| How long the maker says a dust bag lasts with daily use. With pets or a lot of carpet it is shorter. When it matters
When it matters less
Source
| – | up to 65 days |
| How the robot maps your home and follows that map. Lidar measures with a laser and works in the dark, a camera looks along and recognizes more. When it matters
When it matters less
Source
| LiDAR turret | retractable LiDAR |
| Tests, rank and ratings | ||
| The test sites that have tested this model, each linked to its own review. Tests | – | Just A Dad Approved |
| Where the model stands in our ranking, among the robots with the same kind of station. Rank | – | rank 1 of 94 with an all-in-one station |
| The average of the stars buyers give at the stores, with the number of reviews behind it. We only compare it from 20 reviews. Customer rating | – | – |
| Mopping | ||
| How the mop is built: flat pads, two spinning discs or a roller. Discs press harder on dried-on dirt, a roller rinses itself while it works. When it matters
When it matters less
Source
| roller mop | roller mop |
| The robot leaves the mop at the dock before it vacuums a carpet, so the carpet never gets wet. When it matters
When it matters less
Source
| no | no |
| The dock washes the mop for you, so you do not rinse it by hand. When it matters
When it matters less
Source
| yes | yes |
| Drying is done with warm air instead of cold. It is faster and it helps against smell. When it matters
When it matters less
Source
| no | yes (best) |
| Station | ||
| The station the robot returns to, and what it does by itself, such as emptying the bin or washing and drying the mops. Station same on both | all-in-one station | all-in-one station |
| The dock can be connected to the tap and the drain, so you never fill or empty a tank. It does need a connection nearby. When it matters
When it matters less
Source
| no (assumed) | no (assumed) |
| Brush and obstacles | ||
| A brush that guides hair to the side instead of letting it wind around the shaft. It saves the cutting work in homes with long hair or pets. When it matters
When it matters less
Source
| yes | yes |
| How the robot sees loose things on the floor, such as cables, socks or a pet accident. A camera with depth sensing sees more than a bumper that reacts on contact. When it matters
When it matters less
Source
| – | AI camera |
| An extending leg or wheel that carries the robot over a high threshold. Without one it usually stops at about 0.8 in (2 cm). When it matters
When it matters less
Source
| no (assumed) | yes (best) |
| Noise and age | ||
| The noise in decibels, in the setting its source names: makers mostly give the standard setting, stores often the highest. 65 dB is like a vacuum at half power, 55 dB like a conversation. When it matters
When it matters less
Source
| – | 67 dB |
| The month the model first went on sale. It shows how old the technology in it is. On the market since | July 2026 | September 2026 |
| Suction and brushes | ||
| The side brush swings out in a corner or along a baseboard, so the dust there is swept in too. When it matters
When it matters less
Source
| no (assumed) | no (assumed) |
| Whether the robot copes with pet hair: a brush that hair does not wind around and a dock that empties the bin for you. Where the maker does not say so itself, we read it from those two. When it matters
When it matters less
Source
| – | yes |
| A sensor notices where more dirt lies, at the doormat for example, and the robot cleans that patch longer or a second time. When it matters
When it matters less
Source
| – | yes |
| Mopping | ||
| The pad slides out along a wall or a baseboard, so the last few inches are mopped as well. When it matters
When it matters less
Source
| no (assumed) | yes |
| The robot returns to the dock during a run to rinse the mop, instead of pushing dirty water around. When it matters
When it matters less
Source
| yes | yes |
| How much clean water the robot carries. It sets how long it mops before a refill, which a dock does by itself. When it matters
When it matters less
Source
| – | 67 ml |
| Dock | ||
| The dock empties the robot’s dust bin, usually after every run. You only empty the dock’s bag or bin. When it matters
When it matters less
Source
| no (assumed) | yes |
| The dock collects dust in a bin instead of a disposable bag. No bags to buy, but you empty it yourself. When it matters
When it matters less
Source
| yes | no |
| The dock dries the mop afterwards, so it does not sit there wet and start to smell. When it matters
When it matters less
Source
| yes | yes |
| The dock mixes detergent into the water itself, from its own bottle. When it matters
When it matters less
Source
| no (assumed) | yes |
| The clean water tank in the dock, which wets the mop. When it matters
When it matters less
Source
| 2.4 l | – |
| The tank that catches the dirty water from the mop. You empty this one yourself. When it matters
When it matters less
Source
| 1.5 l | – |
| How much the dust bag in the dock holds. Source
| – | 2.7 l |
| How hot the dock washes the mop. Above 140 °F (60 °C) grease comes off, which is what keeps a mop from smelling. When it matters
When it matters less
Source
| – | 212 °F (100 °C) |
| Navigation and obstacles | ||
| Two steps close together, such as a threshold with a sliding-door track behind it: their combined height, as the maker measures it. Each brand measures with a different gap between the steps, so compare this figure across brands with care. For a single step, the threshold above applies. When it matters
When it matters less
Source
| – | 3.5 in (88 mm) |
| Whether the robot has a camera, and what for: to recognize obstacles, or also to show you a live picture of your home in the app. When it matters
When it matters less
Source
| – | obstacle camera |
| Sensors under the robot that see a drop, so it stops at the top of a staircase instead of falling down it. When it matters
When it matters less
Source
| – | yes |
| Robot | ||
| How wide the robot is. Narrower gets between chair legs more easily, wider usually means a bigger dust bin. In this comparisonWhen it matters
When it matters less
Source
| 11 in (28 cm) | 13.9 in (35.3 cm) |
| How much dust the robot holds before you empty it. It matters less with a self-emptying dock, which empties the bin after every run. In this comparisonWhen it matters
When it matters less
Source
| 800 ml | 245 ml |
| What the robot weighs. It counts most if you carry it up a staircase every day. When it matters
When it matters less
Source
| – | 11.5 lb (5.2 kg) |
| Battery | ||
| The capacity of the battery. It hints at the runtime, but how much the robot draws counts just as much. Source
| – | 6,400 mAh |
| How long an empty battery takes to charge fully in the dock. When it matters
When it matters less
Source
| – | 2.5 h |
| Smart features and warranty | ||
| Matter is the standard that lets devices from different makers work together. With it you can run the robot outside the maker’s own app. When it matters
When it matters less
Source
| no (assumed) | yes |
| Which voice assistants the robot works with, such as Google Assistant or Alexa. When it matters
When it matters less
Source
| Alexa, Google Assistant | Alexa, Siri, Google Home |
| The warranty the maker gives in the United States. When it matters
When it matters less
Source
| – | 2 years |
| You set days and times, and the robot starts by itself, also when you are not at home. When it matters
When it matters less
Source
| – | yes |
| Whether the robot works with Home Assistant, the home automation software you run yourself. Official means the integration comes with Home Assistant itself, community that volunteers maintain it. When it matters
When it matters less
Source
| – | official integration |
Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.