Introduction
Both of these come out of the same Maytronics factory, so people assume they clean about the same. They don't. I bought the Dolphin Cayman and the Dolphin Nautilus CC Plus, ran them in my own pool, and filmed the whole thing for the channel. My question going in was simple: if you can only own one, which one do you buy?
The Dolphin Cayman won me over almost immediately. It's a mid-priced cleaner, but it acts like something more expensive. The Weekly Timer means I set a schedule once and stop thinking about it, and the MaxBin swallows a real day's worth of leaves. It scrubs floors and walls without me babysitting it, thanks to the HyperBrush and Smart Nav 2.0. That's the whole point of buying a robot in the first place, and the Cayman actually delivers on it.
The Dolphin Nautilus CC Plus is the one that disappointed me. It used to be a favorite of mine, but the current version has been quietly stripped down. Maytronics pulled the programmable timer, and it still won't touch the waterline. Floor and wall coverage is fine, honestly. It's just that "fine" doesn't cut it once you've watched the Cayman work the same pool right next to it.
Both robots have their place, and I'll be straight about where each one falls apart. If you're deciding between these two, stick with me, because how they behaved during my three months of testing is the whole story here.
One more thing before I get into the testing. I paid for both of these myself, ran them for months, and wrote full standalone reviews on each one if you want the deep dive. Below, I'm putting them head to head on the stuff that actually matters day to day: coverage, filtration, and features.
How We Test
When I test a robot, I'm looking at the same three things every time: how much of the pool it actually reaches, how well the filter holds and traps debris, and what the feature set and warranty give you for the money. I ran both the Dolphin Cayman and the Dolphin Nautilus CC through that same gauntlet so the comparison would be apples to apples.
The Cayman lived in my pool for three months across all kinds of conditions, from a light dusting of pollen to a heavy leaf drop. Its Smart Nav 2.0 system maps a real cleaning path instead of bouncing around at random, and I watched it cover floors and walls without leaving those frustrating missed patches you get with cheaper units.
The Nautilus CC got the same three months, and that's where its limits showed. It's built for smaller pools up to 33 feet, and within those bounds it does clean the floor and walls. But it never held the waterline to scrub it, and that's a real gap when the scum line is usually the dirtiest part of the whole pool.
"Skipping the waterline isn't a small thing. That's where the grime lives."
Filtration was the next thing I dug into. The Cayman ships with a standard fine filter basket that pops out and rinses clean in seconds. I would've loved to see NanoFilters in the box, but even without them, the basket handled everyday dirt and bigger debris without complaint.
The Nautilus CC also runs a standard fine filter, but that's all you get. No enhanced options like NanoFilters. So when the water got a little cloudy or I threw fine particles at it, it just couldn't keep up. If your pool has demanding maintenance needs, that shortfall is going to nag at you.
Then there's the feature set and warranty, which is where the gap really opens up. The Cayman has a programmable timer, so I set it to run daily, every other day, or every three days and then forgot about it. That kind of hands-off scheduling is exactly what I want from a robot.
The Nautilus CC used to have that timer, and now it doesn't. You get an on/off switch, which means you're the one starting every cycle by hand. That single change knocked a lot of the shine off it for me, because manual activation is the exact chore a robot is supposed to erase.
"A robot that makes me start it every time isn't saving me much."
Both robots carry a two-year warranty, which is standard for the price. What tipped things toward the Cayman was how easy it is to live with day to day, plus Maytronics' support behind it. Every time I've had to activate a warranty through Maytronics, it's been painless, and that counts for a lot when you're spending real money.
After all that, my verdict was pretty clear. The Dolphin Cayman is the better buy if you want a reliable, efficient cleaner. The automation, the coverage, and the easy maintenance add up to a robot I'd happily recommend.
The Dolphin Nautilus CC still does a capable job, but it's missing the modern conveniences and the complete coverage that the Cayman brings. If you want thorough cleaning and a genuinely user-friendly experience, the Cayman is the clear winner.
If you want even more, step up to something like the Dolphin Premier or the Dolphin Sigma.
Those two add waterline cleaning, more filtration options, and longer warranties, which makes a real difference if your pool works its robot hard. I've written full reviews on each, so check those to see which one fits your pool.
Coverage
Coverage is where these two really split. The Dolphin Cayman cleans both floors and walls, and it does it with conviction thanks to the HyperBrush and HyperGrip tracks. Those tracks let it grip and climb, so it scrubs surfaces properly instead of just gliding over them. In my testing, it handled different pool shapes and sizes without drama.
The Dolphin Nautilus CC also does floors and walls, but it won't clean the waterline. That's a bigger deal than it sounds, because the waterline collects the most gunk of anywhere in the pool. The Nautilus CC just doesn't stick up there to scrub, and that hole in its coverage follows you around.
Pool Coverage Score: The Cayman lands a 10/10 here, while the Nautilus CC gets a 7/10. The Cayman's Smart Nav 2.0 lays down precise, calculated paths, which is what earns it the top mark. The Nautilus CC loses points purely because it can't touch the waterline. Everything else it does reasonably well.
The Cayman's Programmable Weekly Timer stacks another advantage on top. I could schedule it to run daily, every other day, or every three days and then leave it alone. The Nautilus CC has nothing like that, so you're manually kicking off every session, which chips away at how convenient it feels to own.
"With the Cayman, I stopped finding missed spots. That says everything."
Both robots navigate well enough on their own. But the Cayman's HyperBrush and HyperGrip combo just brings more scrubbing muscle than the Nautilus CC's standard setup. You notice it most on stubborn stuff, the caked-on debris and algae that a weaker robot skates right past.
Add it up and the Cayman gives you the fuller cleaning experience. Better navigation, real scheduling, and stronger wall scrubbing put it ahead of the Nautilus CC by a comfortable margin. If thorough cleaning with minimal hands-on effort is what you're after, the Cayman is the one to get.
"For coverage and automation, the Cayman is the better robot. Full stop."
The Nautilus CC is fine for the basics, but its coverage gaps and lack of automation make it the weaker pick against the Cayman. If you want the advanced features and the more efficient cleaning, go Cayman.
Filters
The filter systems make the split between the Dolphin Cayman and the Dolphin Nautilus CC obvious. The Cayman uses the MaxBin, and it's a genuine step up in both capacity and how easy it is to keep clean.
What I like about the MaxBin is that it's bigger and simpler to deal with. There's a drop-down latch, so I'd pull the basket, rinse it, and drop it back in without thinking twice. That matters when you're emptying it often. It takes everything from big leaves down to fine dirt, which covers most of what your pool throws at a robot.
"Emptying the Cayman's MaxBin is a ten-second job. I'll take that every day."
The Nautilus CC gives you a standard fine filter and nothing more. It does the everyday job, but it wrestles with finer particles. Without NanoFilters in the picture, it struggles to clear cloudy water, and that's the kind of thing that quietly frustrates you once your pool actually needs it.
On filtration, the Cayman is plainly ahead. Its MaxBin holds more debris and is easier to maintain. The Nautilus CC's basic system still works, but it isn't nearly as efficient once the cleaning gets demanding.
Filter Score: The Cayman scores 10/10 and the Nautilus CC gets a 7/10. The Cayman's MaxBin plus its optional NanoFilters give it the edge, and that makes it the better choice if filtration is high on your list.
So to sum it up, the Cayman's better filter, easier maintenance, and higher capacity make it the stronger pick for most pool owners. The Nautilus CC is competent, but it can't keep pace with the Cayman here. If filtration is what you care about most, the Cayman wins this round.
"On filtration, the Cayman is the winner and it isn't especially close."
If you want better filtration and easier upkeep, the Dolphin Cayman is where I'd point you. The MaxBin and the option to add NanoFilters give it a level of performance the Nautilus CC just can't match.
Feature Set
Line up the feature sets of the Dolphin Cayman and the Dolphin Nautilus CC and the differences jump out. The Cayman leans hard on automation. It has a programmable weekly timer that lets you run it daily, every other day, or every three days. For a pool owner, that's the difference between owning a robot and owning a chore.
The Nautilus CC has been trimmed down in recent versions. The once-popular programmable timer is gone, so you're starting every cleaning cycle by hand. That single cut really hurts it as a set-and-forget cleaner, which is what most people actually want.
The Cayman also runs the MaxBin for debris, and it's larger and more efficient than the standard fine filter in the Nautilus CC. It's easier to empty and holds more, which suits real pool maintenance better. On top of that, you can add NanoFilters to the Cayman if you want to step up its filtration.
"The MaxBin plus optional NanoFilters give the Cayman filtration the Nautilus CC can't touch."
On features, the Cayman scores 9.4/10. It crams a genuinely good feature set into an entry-level price, which is where a lot of its value comes from. The programmable timer and the sturdy MaxBin make it a reliable, low-effort cleaner.
The Nautilus CC scores lower here at 5/10. Losing the programmable timer is a real drawback if you want automation, and while its standard fine filter works, it's nowhere near the filtration you can get out of the Cayman.
"Automation is the Cayman's biggest advantage over the Nautilus CC."
Both robots come with a two-year warranty, so you're covered either way. But the day-to-day experience is where they diverge. The Cayman's easy maintenance and scheduling make it the one I'd reach for if I wanted a robot that just handles itself.
Bottom line, the Dolphin Cayman gives you better features and a nicer experience than the Dolphin Nautilus CC. The automation, the stronger filtration, and the user-friendly design make it the stronger robot of the two.
If modern features and automation matter to you, the Cayman is the better call. The Nautilus CC still works as an entry-level cleaner, but it's missing the features a lot of pool owners now expect.
Want even more? Models like the Dolphin Premier, Dolphin Sigma, and Dolphin Quantum bring fuller cleaning and longer warranties. I've reviewed each one in detail if you want to find the right fit.
Conclusion
After running the Dolphin Cayman and the Dolphin Nautilus CC side by side, each has its strengths and weaknesses, but the gap is real. The Cayman scores 9.4/10, which puts it among the best robots I've tested.
Its Weekly Timer, HyperBrush, and MaxBin are what set it apart. Combined, they make it efficient and easy to live with. The automated scheduling and solid filtration keep the pool clean while I do basically nothing, and that's the dream for most owners.
The Nautilus CC lands at 6.3/10. Its floor and wall cleaning are decent, but the missing programmable timer and the absence of NanoFilters make it less convenient and less capable than the Cayman.
Head to head, the Dolphin Cayman is the clear winner. Fuller cleaning, easier to use, and more features make it the better robot for anyone who wants reliable, efficient cleaning without the fuss.
If both scores feel low for what you need, look at the Dolphin Premier, Dolphin Sigma, and Dolphin Quantum. Those bring waterline cleaning, more filtration options, and longer warranties.
In the end, it comes down to what you value. If you want automation and complete cleaning, get the Cayman. If you just need basic functionality, the Nautilus CC is a reasonable if less advanced choice.
Take a look at my roundup of the best pool robots to find your match. Whether you care most about automation, features, or all-around cleaning, there's a robot out there that fits.
Alternate Robots
If you want the highly-rated stuff beyond these two, a few models are worth a real look. The Dolphin Premier and Dolphin Sigma are the ones I keep coming back to for their features and how they perform.
The Dolphin Premier is the filtration heavyweight. It runs Multi-Media filtration with several filter options, including an oversized leaf bag and NanoFilters. That range means it handles everything from leaves to fine particles. Its dual scrubbing brushes and strong motors clean thoroughly, waterline included, which is exactly where a lot of robots give up. It also has a programmable weekly timer and a longer three-year warranty, which is reassuring when you're spending this much.
The Dolphin Sigma is the other one I'd flag. It's built on a commercial-grade platform with three motors and a gyroscope for precise navigation. It adds Wi-Fi, so you can control and schedule it from your phone. It carries both NanoFilters and standard fine filters, which makes it strong on cloudy water and fine debris. Like the Premier, it cleans the waterline well and comes with a three-year warranty.
"The Sigma is basically commercial-grade hardware sized for a home pool."
For the best value, look at the Dolphin Escape, built mainly for above-ground pools. It has a strong scrubbing brush and Smart Nav 2.0 for efficient cleaning, and its MaxBin filter basket holds a good amount of debris. It's a no-frills, get-it-done cleaner that's simple to set up and run.
If you want something more versatile and powerful, the Dolphin Quantum is another strong choice. It has a larger XXL MaxBin filter and includes NanoFilters. Its Powerjet 3D mobility lets it clean the waterline effectively, and the programmable weekly timer makes scheduled cleaning easy.
So if you want an alternative to the Dolphin Cayman and Dolphin Nautilus CC, look hard at the Dolphin Premier and Dolphin Sigma. Both clean better and pack more features, which makes them excellent picks for keeping a pool clean and healthy.