The models in detail
This page helps owners of inground pools choose a robot that handles the floor, the walls and, if needed, the tile line. We compared six corded and cordless models using Amazon.com product listings checked on October 10, 2026, looking at stated pool size, power source, cleaning zones and filtration. We did not run these cleaners in a pool, so the figures are the manufacturers' claims.
1 · Our pick
Dolphin Nautilus CC Plus
Robotic pool cleaner4,3/5 from 13974 Amazon customer ratings (as of October 10, 2026)
The Dolphin Nautilus CC Plus earns the top spot on reliability signals rather than features. With 13,974 customer ratings at 4.3 out of 5, it has by far the largest review base on this page. For an inground pool, it covers what matters most: it climbs and scrubs walls with an active brush, runs a 2-hour cycle, and has a weekly timer per the brand chart. Being corded, it never stops for a recharge the way the WYBOT C1 does. The top-load filter basket empties from above. Know its limits before buying. Dolphin's own chart says it does not clean the waterline and has no smartphone connection, unlike the Polaris 9550 Sport, which scrubs the tile line. Pool length is inconsistent, 40 ft in the title and 50 ft in the chart, so plan on the lower figure. The robot's weight is not given, and the chart describes the filter as large panels while the bullets describe a basket.
Pros, cons and specs
Pros
- Climbs and scrubs walls with an active scrubbing brush, according to the listing.
- Plug-and-play setup: drop it in, power on, and it runs a 2-hour cycle.
- Weekly timer included, per the brand comparison chart.
- Top-load filter basket that you empty from above.
Cons
- No waterline cleaning and no smartphone connection, per the brand comparison chart.
- Pool length is inconsistent: 40 ft in the title, 50 ft in the comparison chart; the robot's weight is not given.
- The chart describes the filter as large panels while the bullets describe a top-load basket.
Best for: Owners of small to mid-size in-ground pools who want a simple corded Dolphin with a weekly timer and no app.
Skip it if you need waterline scrubbing, app control, or a cleaner for an above-ground pool.
Other specs
- Pool typeIn-ground
- Runtime2-hour cycle
2 · Wi-Fi scheduling
Dolphin Nautilus CC Plus Wi-Fi
Robotic pool cleaner3,6/5 from 3291 Amazon customer ratings (as of October 10, 2026)
The Nautilus CC Plus Wi-Fi is the version to choose if you want to set cleanings from your phone. According to the listing, Wi-Fi lets you schedule from anywhere, and the robot climbs and scrubs walls on any pool shape or surface type. Like the standard CC Plus, it runs a 2-hour cycle, has a weekly timer per the brand chart and uses a top-load filter basket. It is corded, always plugged in, so there is no battery to charge. The chart also lists what it lacks: no waterline cleaning, no cycle selector and no remote steering, which the Polaris 9550 Sport offers through a handheld remote. Pool length is again listed as 40 ft in the title and 50 ft in the chart, and the weight is missing. The listing warns to use the original power supply without an extension cord, and notes the supply is splash-proof, not waterproof. Its 3.6 rating from 3,291 reviews is the lowest on this page.
Pros, cons and specs
Pros
- Wi-Fi lets you schedule cleanings from anywhere, according to the listing.
- Climbs and scrubs walls on any pool shape or surface type.
- Plug-and-play: drop it in and it runs a 2-hour cycle; weekly timer per the brand chart.
- Top-load filter basket for easy emptying.
Cons
- No waterline cleaning, cycle selector or remote steering, per the brand chart.
- Pool length is inconsistent (40 ft in the title, 50 ft in the chart) and the weight is not given.
- Must use the original power supply without an extension cord; the supply is splash-proof, not waterproof.
Best for: Owners of in-ground pools who want the basic Nautilus with Wi-Fi scheduling.
Skip it if you need waterline scrubbing or a cleaner meant for an above-ground pool.
Other specs
- Pool typeIn-ground
- Runtime2-hour cycle
3 · Pools up to 33 ft
Dolphin Proteus DX3
Robotic pool cleaner4/5 from 2262 Amazon customer ratings (as of October 10, 2026)
The Dolphin Proteus DX3 suits smaller inground pools: the listing sizes it for pools up to 33 ft long, the shortest limit on this page. Within that size, it does the core job. It climbs walls and uses an active scrubbing brush on the floor and walls, has a weekly timer per the brand chart, and collects debris in a large top-load filter basket that you empty and rinse after each cycle. Setup is plug-and-play: place it in the pool, plug in the power supply and press start or use the weekly scheduler. The brand chart lists no waterline cleaning, no cycle selector and no smartphone connection, so it is a step below the Polaris 9550 Sport on features. Cycle time is inconsistent, 2 hours in the bullets against 2.5 hours in the chart, and the weight is not given. It holds 4 out of 5 from 2,262 customer ratings, between the two Nautilus versions.
Pros, cons and specs
Pros
- Climbs walls and uses an active scrubbing brush on floor and walls, according to the listing.
- Weekly timer included, per the brand comparison chart.
- Large top-load filter basket that you empty and rinse after each cycle.
- Plug-and-play: place it in the pool, plug in the power supply and press start or use the weekly scheduler.
Cons
- No waterline cleaning, no cycle selector and no smartphone connection, per the brand chart.
- Sized for pools up to 33 ft long only.
- Cycle time is inconsistent (2 hours in the bullets, 2.5 hours in the chart) and the weight is not given.
Best for: Owners of smaller in-ground pools who want a basic corded Dolphin with a weekly timer.
Skip it if your pool is longer than 33 ft or you want waterline scrubbing and app control.
Other specs
- Pool typeIn-ground
- Runtime2 hours (description) / 2.5 hours (brand chart)
4 · Large pools, tile line
Polaris 9550 Sport
Robotic pool cleaner3,9/5 from 1355 Amazon customer ratings (as of October 10, 2026)
The Polaris 9550 Sport is built for large inground pools: the listing covers pools up to 60 ft, the longest stated limit on this page, with a 70 ft swivel cable that reduces tangling. Four-wheel drive lets it climb steps and walls and scrub the tile line with a solid-blade brush, which none of the Dolphins here claim. You choose 1.5 or 2.5 hour cycles, set a 7-day programmable timer, and can steer it to a specific spot with a motion-sensing handheld remote. Debris goes into an extra-large 5L canister with a dirty canister indicator; it empties with a shake and a spray of water. A control box and a caddy for transport come in the box. What you give up: no Wi-Fi or app, which Polaris reserves for another model, and no stated weight or power draw. The description claims 5 cleaning modes, while the spec block lists only Floor and Floor & Wall. Rating: 3.9 from 1,355 reviews.
Pros, cons and specs
Pros
- Four-wheel drive lets it climb steps and walls and scrub the tile line with a solid-blade brush, according to the listing.
- The 7-day programmable timer and the motion-sensing handheld remote let you schedule cycles or steer it to a specific spot.
- The extra-large 5L canister has a dirty canister indicator and empties with a shake and a spray of water.
- Ships with a 70 ft swivel cable, a control box and a premium caddy for transport and storage.
Cons
- No Wi-Fi or app control: the brand chart reserves smart features for the 9650iQ Sport.
- The robot's weight and the power draw are not given in the listing.
- The description claims 5 cleaning modes, but the spec block lists only Floor and Floor & Wall.
Best for: Owners of large inground pools who want a corded 4WD cleaner with a timer and a handheld remote rather than an app.
Skip it if you want app scheduling, Alexa control or a cordless robot for an above-ground pool.
Other specs
- Pool typeInground
- Runtime1.5 or 2.5 hour cleaning cycles
5 · Cordless, four zones
WYBOT C1
Robotic pool cleaner4/5 from 1038 Amazon customer ratings (as of October 10, 2026)
The WYBOT C1 is the choice if you want no cable at all in an inground pool. According to the description, it cleans the floor, walls, waterline and steps for pools up to 1,618 sq ft and depths up to 9.86 ft, with up to 160 mins per charge after a 4-hour charge. A triple-motor system climbs 45° slopes, gyroscope navigation follows N-Path and S-Path patterns, and the WYBOT app handles schedules and firmware updates. Compared with the corded Dolphins, it adds waterline cleaning but swaps unlimited runtime for a battery that must be recharged out of the water. Note that the brand table lists 150 mins and 1,615 sq ft instead, and that smooth walls require the included floating kit. Filter fineness and weight are not given. Pool size is stated in square feet rather than length, so measure your surface before comparing it with the Dolphins and the Polaris. It is rated 4 out of 5 from 1,038 reviews.
Pros, cons and specs
Pros
- Cleans the floor, walls, waterline and steps with a triple-motor system that climbs 45° slopes.
- Gyroscope navigation follows N-Path and S-Path patterns to reduce missed spots.
- Up to 160 mins per charge for pools up to 1,618 sq ft and 9.86 ft deep, according to the description.
- WYBOT app for schedules and modes, with OTA firmware updates.
Cons
- Climbing smooth walls requires installing the included floating kit.
- Runtime and area differ between the description and the brand table (150 mins and 1,615 sq ft).
- Filter fineness and weight are not given.
Best for: Inground pool owners who want a cordless robot that also cleans walls and the waterline.
Skip it if your pool is deeper than 9.86 ft.
Other specs
- Pool typeInground (table also lists above ground)
- Runtimeup to 160 mins (4-hour charge)
6 · Waterline and fine filter
Aiper Scuba S1 (2026)
Robotic pool cleaner4,4/5 from 871 Amazon customer ratings (as of October 10, 2026)
The Aiper Scuba S1 (2026) has the most ambitious cleaning claims on this page. It lists four zones, floor, walls, waterline and shallow areas above 12 inches, which helps on the sun shelves and wide steps many inground pools have. Runtime is claimed at up to 270 minutes in Eco mode and 180 minutes in Auto, Floor or Wall modes, and 11 sensors with WavePath navigation aim for systematic coverage. Filtration pairs a replaceable 3-micron ultra-fine filter with a 180-micron standard filter, finer than anything the Dolphins or the Polaris state. It also carries a 2-year warranty and the best customer rating here, 4.4 from 871 reviews. The caveat is serious for this page: the listing does not say which pool types it suits, what it weighs or how it is powered. Confirm inground compatibility with the seller first. The ultra-fine filter is replaceable, so expect to rebuy it over time.
Pros, cons and specs
Pros
- Cleans four zones: floor, walls, waterline and shallow areas above 12 inches.
- Up to 270 minutes in Eco mode and 180 minutes in Auto, Floor or Wall modes.
- 11 sensors and WavePath navigation for systematic coverage with less overlap, according to the listing.
- Dual filtration with a replaceable 3-micron filter, plus a 2-year warranty.
Cons
- The listing does not state which pool types it suits (inground or above ground), its weight or its power source.
- The ultra-fine filter is replaceable, so it is likely a recurring purchase.
Best for: Pool owners who want floor-to-waterline cleaning with long runtime.
Skip it if you need confirmed compatibility with an above-ground pool before buying.
Other specs
- Runtimeup to 270 minutes (Eco), 180 minutes (Auto/Floor/Wall)
How to choose a robotic pool cleaner for an inground pool
Start with your pool's length or surface
Choose a robot rated for a pool at least as large as yours, using the lower figure when a listing contradicts itself. The Dolphin Proteus DX3 is sized for pools up to 33 ft long, the two Nautilus CC Plus versions up to 40 ft in the title but 50 ft in the brand chart, and the Polaris 9550 Sport for pools up to 60 ft. The WYBOT C1 states surface instead, up to 1,618 sq ft, so measure your pool's area before comparing it with the length-rated models.
Choose between corded and cordless power
Corded robots run every cycle without recharging, while cordless ones remove the cable at the cost of charge time. The three Dolphins and the Polaris 9550 Sport plug into an outlet; the Polaris ships with a 70 ft swivel cable. The WYBOT C1 runs on a battery, claiming up to 160 mins after a 4-hour charge. The Aiper Scuba S1 listing does not state its power source. For a large inground pool you clean several times a week, a corded model is the simpler routine; see our cordless page if the cable bothers you.
Decide if you need tile-line or waterline cleaning
If your inground pool shows a ring at the tile line, pick a robot that cleans it, because the Dolphins here do not. Dolphin's own chart says the Nautilus CC Plus, its Wi-Fi version and the Proteus DX3 skip the waterline. The Polaris 9550 Sport scrubs the tile line with a solid-blade brush, the WYBOT C1 lists the waterline, and the Aiper Scuba S1 claims floor, walls, waterline and shallow areas above 12 inches. If you brush the tile line yourself, a floor-and-wall robot is enough.
Compare filtration and how you empty it
Pick the finest filter you can if sand and fine dust settle in your pool. The Aiper Scuba S1 is the only model here with a stated fineness, a 3-micron ultra-fine filter plus a 180-micron filter, and the fine one is replaceable, so budget for refills. The Polaris 9550 Sport uses an extra-large 5L canister with a dirty canister indicator. The Dolphins use top-load baskets you empty from above, though the brand chart describes large panels for the Nautilus. The WYBOT C1 does not state its filter fineness.
Think about scheduling and control
Decide whether a built-in timer is enough or you want phone control. The Nautilus CC Plus and the Proteus DX3 have a weekly timer and no app. The Nautilus CC Plus Wi-Fi adds scheduling from anywhere over Wi-Fi. The Polaris 9550 Sport has a 7-day programmable timer and a motion-sensing handheld remote to steer it toward a spot, but no app. The WYBOT C1 uses an app for schedules and modes. More control helps only if you will use it; a weekly timer covers most routines.
Skip it if…
- your inground pool is longer than 33 ft and you were leaning toward the Dolphin Proteus DX3, which is not sized for it.
- you want the tile line scrubbed automatically by a Dolphin, since Dolphin's chart says none of the three here cleans the waterline.
- you need app control on the Polaris 9550 Sport, which offers a timer and a handheld remote but no Wi-Fi.
- you would run the Nautilus CC Plus Wi-Fi on an extension cord, which the listing says not to do.
- you plan to buy the Aiper Scuba S1 before confirming with the seller that it suits an inground pool and how it is powered.
FAQ
What is the best robotic pool cleaner for inground pools?
For most owners, the Dolphin Nautilus CC Plus is the best robotic pool cleaner for inground pools on this page. It climbs and scrubs walls, runs a 2-hour cycle, has a weekly timer and holds 4.3 out of 5 from 13,974 ratings. For pools up to 60 ft that need tile-line scrubbing, look at the Polaris 9550 Sport instead.
Do robotic pool cleaners clean the tile line in inground pools?
Some do, but not every model. The Polaris 9550 Sport scrubs the tile line with a solid-blade brush, the WYBOT C1 lists waterline cleaning, and the Aiper Scuba S1 claims the waterline too. Dolphin's own chart says the Nautilus CC Plus, the Nautilus CC Plus Wi-Fi and the Proteus DX3 do not clean the waterline, so plan to brush it yourself with those.
Corded or cordless robot for an inground pool?
A corded robot is the easier routine for frequent cleaning, because it never stops to recharge. The Dolphins and the Polaris 9550 Sport here are corded. A cordless robot such as the WYBOT C1 removes the cable from the water, but it claims up to 160 mins per charge and needs a 4-hour recharge out of the pool. Choose by how often you clean.
How big of an inground pool can a robotic cleaner handle?
It depends on the model's rating. On this page, the Polaris 9550 Sport is listed for pools up to 60 ft, the Nautilus CC Plus up to 40 ft in its title and 50 ft in the brand chart, and the Proteus DX3 up to 33 ft. The WYBOT C1 states up to 1,618 sq ft and depths up to 9.86 ft. Use the lower figure when a listing gives two.
How long is a cleaning cycle for an inground pool robot?
Cycle times on this page are listed between 1.5 and 2.5 hours for the corded models. The Nautilus CC Plus runs a 2-hour cycle, the Polaris 9550 Sport offers 1.5 or 2.5 hour cycles, and the Proteus DX3 lists 2 hours in its bullets but 2.5 hours in the chart. The cordless Aiper Scuba S1 claims up to 270 minutes in Eco mode.
Is the Wi-Fi version of the Dolphin Nautilus CC Plus worth it?
It is worth it only if you want to schedule cleanings from your phone. Otherwise, the standard Nautilus CC Plus already has a weekly timer, the same 2-hour cycle and the same wall scrubbing. The Wi-Fi version is rated 3.6 out of 5 from 3,291 reviews, against 4.3 from 13,974 for the standard model, and it has no remote steering or cycle selector.
Ilias, Robocompas
Models are picked from the product listings on Amazon.com, recorded and dated. Missing data is flagged instead of guessed, and no hands-on test is described unless it actually happened.
Our method