Introduction
If you're shopping at the top of Maytronics' lineup, the Dolphin Quantum and the Dolphin Sigma are the two names that keep coming up. Both live in the Proline family, both are built to actually scrub a pool clean instead of just pushing water around, and I've had both running in my own pool for the better part of three months. I bought each one with my own money, ran them the way a normal pool owner would, and filmed the results. That's the only way I know to tell you which one earns its price.
Here's where the Quantum shines. Its XXL MaxBin and NanoFilters make it, in my testing, one of the best values in the whole robot category. I scored it 9.7 out of 10. Coverage is genuinely excellent, waterline included, and a lot of that comes down to Powerjet 3D mobility paired with the Smart Nav 2.0 scanning system. The dual motors move over 4,000 gallons an hour, and I watched them inhale debris that my old cleaner would have shoved into a corner. Two brushes, not one, so nothing gets skipped.
Then there's the Sigma, which is the most advanced cleaner I've reviewed all year. It's built on Maytronics' commercial platform, so you get three commercial-grade motors, a gyroscope that keeps its navigation honest, and a full Wi-Fi app for running it from your phone. Filtration comes in two flavors, standard and ultrafine. I gave it a near-perfect 9.8 out of 10. From the floor to the waterline, it just leaves the pool spotless, and it does it without much fuss on your end.
Both robots clean at a level most people never experience, but they're aimed at slightly different buyers. The Quantum is the value pick, the one I'd hand a friend who wants premium results without paying the absolute top dollar. The Sigma is the ceiling, the best of what robotic cleaning can do right now.
Up next, I'll walk you through exactly how I put both of these through their paces, so you know the scores aren't pulled out of thin air.
How We Test
My testing runs about three months per robot, because a pool changes with the seasons and one good weekend doesn't tell you anything real. I ran both the Dolphin Quantum and the Dolphin Sigma through the same three buckets I always use: pool coverage, filtration, and features plus warranty.
Starting with the Quantum's coverage. It cleans everything, floor to waterline, and the two scrubbing brushes plus Smart Nav 2.0 mean I rarely found a patch it missed. What surprised me most was the Powerjet 3D mobility along the waterline. A lot of robots claim waterline cleaning and then just bump the wall. This one actually climbed and held the tile line.
For filtration I ran both the Standard Fine and the NanoFilters. The basket is big, and with the NanoFilters loaded I watched it pull microscopic junk out of water that had gone cloudy on me. By the end of a cycle the water was noticeably clearer. That's about as high as I can rate a filter system.
On features and warranty, the Quantum ships with a programmable power supply and a two-year Maytronics warranty. I set a weekly schedule and then basically forgot about it, which is exactly what you want a robot to let you do. Easy to run, well supported, high marks.
"The Quantum landed at 9.7 out of 10, and I'd still call it one of the best values in pool robots."
Then I switched to the Sigma, and I was curious how far a commercial platform would push things. Coverage is about as good as it gets. Three commercial-grade motors and a gyroscope for navigation meant it cleaned floor to waterline and hit corners the Quantum occasionally grazed. Nothing got left behind.
Filtration is another strong spot. The Sigma runs both standard fine and ultrafine filters, so it grabs the big leaves and the fine silt alike. It doesn't come with an oversized leaf bag the way the Dolphin Premier does, but honestly the filter system handled everything my pool threw at it.
Where the Sigma really pulls ahead is the app. Wi-Fi connectivity through myDolphin Plus gave me manual control, custom schedules, and delay-start, all from the couch. The app is genuinely intuitive, not the afterthought some of these are. Pair that with a three-year warranty and it's the most user-friendly, most trustworthy setup in the comparison.
"At 9.8 out of 10, the Sigma is the closest thing to a perfect pool robot I've tested."
So both are elite. Whether you lean toward the value-packed Quantum or the feature-loaded Sigma, you're getting a cleaner that holds up over the long haul. Want to see how they stack against the rest of the field? Take a look at my best pool robots rankings.
Coverage
Coverage is where I spend most of my testing time, because a robot that misses spots just makes more work for you. The Dolphin Quantum and Dolphin Sigma both cover a pool beautifully, but they get there by slightly different routes. The Quantum handles floor-to-waterline duty about as well as anything at its price.
Two scrubbing brushes and Powerjet 3D mobility are the secret. In my pool the Quantum worked methodically instead of randomly, using Smart Nav 2.0 to map its path and dig into built-up dirt and algae. The waterline is where Powerjet 3D earns its keep, letting the robot climb and actually scrub the tile line rather than just brushing past it.
The Sigma comes at coverage from its commercial roots. It runs three commercial-grade motors and a gyroscope, and that combination shows up as cleaner corners and steadier climbs. Floor to waterline, including the tight spots most robots fudge, it cleaned with a precision that stood out even next to the Quantum.
"That gyroscope isn't marketing fluff. It's why the Sigma turns tight and tracks straight."
The gyroscope is the piece I keep coming back to. It tracks where the unit is sitting, which translates into tighter turns and more accurate paths whether it's crawling the floor or holding the waterline. Watching it stay balanced and stable while it scrubbed the tile line was genuinely impressive.
Both robots maxed out my coverage score. The Quantum took a clean 10 out of 10 on the strength of its dual brushes and Powerjet 3D. The Sigma matched it, also a 10 out of 10, thanks to that gyroscope and its three commercial-grade motors doing the navigation heavy lifting.
Bottom line, you can't go wrong here on coverage. The Quantum leans on mobility and a two-brush scrub to hit everything from floor to waterline. The Sigma leans on precision and stability, especially around the waterline, where the gyroscope and commercial motors really separate it from the pack.
Two perfect 10s, two clean pools. Whether you're drawn to the Quantum's mobility and dual-brush setup or the Sigma's gyroscope-guided precision, you're covered in every sense of the word.
"On coverage alone, either one earns its spot at the top of my list."
Filters
Filtration is where a lot of robots quietly fall apart, so I test it hard. Comparing the Dolphin Quantum and the Dolphin Sigma here is interesting because they solve the problem differently. The Quantum runs a larger Gen-2 filter bin with standard fine and NanoFilters. The Sigma pairs standard fine with ultrafine filters.
What makes the Quantum stand out is the XXL MaxBin, which gives you over 400 square inches of filter capacity. That's a lot of room, and it means the robot chews through a wide range of debris in one cycle without clogging, from fallen leaves down to microscopic grit. The NanoFilters are the star for me, catching the fine particles that turn pool water cloudy.
The Sigma answers with ultrafine filters that go after the tiniest particles. It skips the oversized leaf bag you'd get on the Dolphin Premier, but in my testing the filters kept the water clear anyway, grabbing both the big stuff and the fine stuff without much drama.
If you're asking what I actually reach for, it's the Quantum's NanoFilters. They cover the fine-particle end so thoroughly that my water stayed clear for longer between cleanings. The Sigma's ultrafine filters are no slouch either, and they hold up especially well over long stretches of use.
"Both filter systems are excellent, but the Quantum's NanoFilters nudged it ahead."
On the scorecard, the Quantum earned a perfect 10 in filtration on the back of its dual filter types and larger capacity. The Sigma came in right behind at 9.4, and the only thing holding it back is the missing oversized leaf bag, not the ultrafine filters themselves, which are excellent.
Both are strong. If I have to pick a filtration winner, the Quantum's filter variety and bigger bin edge it out, which makes it my pick for anyone dealing with a wide mix of debris types.
Feature Set
Feature sets are where these two really show their personalities. The Dolphin Quantum and Dolphin Sigma are both loaded, just in different directions. The Quantum brings the XXL MaxBin, included NanoFilters, a weekly timer, and the Powerjet 3D mobility system. Put those together and you've got a complete, efficient cleaner with nothing missing that matters.
The Sigma is a different animal, built on that commercial platform with three commercial-grade motors, a gyroscope, and a Wi-Fi app. Round it out with NanoFilters and a three-year warranty and you've got a machine that performs hard and backs it up with real support.
"Two loaded robots, two very different ways of loading them."
Day to day, the Quantum keeps things simple. The programmable power supply lets you set a schedule and walk away, so it can run a full week without you touching it. That weekly timer sounds small, but it's the feature I used most.
The Sigma takes that same idea and puts it on your phone. The myDolphin Plus app over Wi-Fi lets you build custom schedules, drive the robot manually, and delay the start time, all remotely. Managing cleanings from anywhere is a real convenience once you've lived with it.
Don't overlook the gyroscope on the Sigma either. Beyond navigation, it keeps the cleaning coverage precise, which means less babysitting and fewer missed spots. It's the kind of feature you stop noticing because it just works.
On the feature score, the Quantum earned a 9. The XXL MaxBin and Powerjet 3D carry it, and the whole package is a strong value for anyone who wants effective, no-nonsense cleaning.
The Sigma took the perfect 10. Commercial-grade motors, the gyroscope, app connectivity, and the longer warranty together make it the most advanced cleaner you can buy right now, and the score reflects that.
"That perfect feature score isn't hype. The Sigma really is the most advanced robot I've run."
So the Quantum is the smart-value play with a genuinely strong feature list, and the Sigma is the do-everything flagship with unmatched convenience. Whichever fits your needs, you're getting exceptional pool cleaning performance.
Want to see how these two compare against the rest of my picks? Head over to the best pool robots page.
Conclusion
"Both robots clean like champs, but the Sigma is the one that walks away with the crown."
After three months with each, my takeaway is simple. The Dolphin Quantum and the Dolphin Sigma are both outstanding robots. The Quantum earned a 9.7 out of 10 on the strength of its efficient dual motors, the larger XXL MaxBin, and the included NanoFilters, and it does all that at a price that keeps it firmly in value territory.
The Sigma reaches higher. Three commercial-grade motors, a gyroscope for precise navigation, and a full Wi-Fi app for remote control push it to a near-perfect 9.8 out of 10. It wins on raw performance and on day-to-day convenience.
"Head to head, the Dolphin Sigma takes it on sheer technology and features."
The Quantum is a fantastic value, no question. But the Sigma's extra features and higher performance make it the better buy if you specifically want the best robotic cleaning money can get. For that top-tier crowd, the Sigma is the clear winner.
You'll be happy with either one. If your priority is the ultimate mix of convenience and cleaning power, though, the Sigma is the one I'd point you to. For the full picture and a look at everything else worth considering, check out my best pool robots reviews and recommendations.
Alternate Robots
If neither of these is quite the fit, a few other robots deserve a spot on your shortlist. Take the Dolphin Escape, which is my go-to recommendation for above-ground pools. It scores well for solid performance and an easy learning curve, and the HyperBrush and MaxBin combo lets it clear debris without much effort. People who own it tend to praise how simple it is to run alongside how hard it cleans.
"For above-ground pools, the Escape is the one I keep recommending."
Chasing something more premium? The Dolphin Premier is worth a hard look. Its multimedia filtration system stands out, with both a NanoFilter and an oversized leaf bag on hand. Add dual scrubbing brushes and a strong motor, and it leaves no part of the pool untouched.
Working with a tighter budget but still want real cleaning power? Look at the Aquabot REVA. It's known for waterline cleaning and gyroscopic navigation, and it's built a reputation for being reliable without the premium price. The dual-layer filtration handles both big debris and fine particles, which is more than you'd expect at its cost.
"The REVA is my value pick when the budget is the main constraint."
So whether it's the Dolphin Escape for an above-ground pool, the Dolphin Premier for that multimedia filtration, or the Aquabot REVA when price is the deciding factor, each one brings something specific to the table. To see them lined up against every other robot I've tested, head to my best pool robots page.