Introduction
The Dolphin Cayman and the Dolphin Proteus DX3 both land on a lot of shortlists, so I bought both and ran them in my pool to see how they really compare. I wanted to know how each performed in real conditions and whether they lived up to the hype.
I picked up the Dolphin Cayman and right away liked that it's mid-priced but cleans like something pricier. The Weekly Timer, HyperBrush, and SmartNav 2.0 make it genuinely automatic, and in my testing it delivered a thorough clean. It doesn't do the waterline, but that's the one real gap.
The Dolphin Proteus DX3 impressed me too, handling both floors and walls. Where it slips is filtration options and, again, waterline cleaning. Across my testing it proved solid and dependable, but I kept coming back to the hidden restocking fee so many owners have reported.
Both robots have real strengths and real weaknesses. The Cayman wins on automation and clean, efficient cleaning paths. The Proteus DX3 has strong cleaning power but stumbles on hidden costs and a thinner feature set. That got me thinking about how much you need to know about a robot before you hand over your money.
"I ran both for real, and they didn't end up in the same league."
The lesson from testing is to look closely at the specifics of each model so it actually fits your pool. So how did I test them? Let me walk you through my method and what I graded these two on.
How We Test
I grade every robot on three things: pool coverage, filtration, and features plus warranty. Each one runs in my pool for three months so I see the full picture, not just a good first week. That stretch of time shows me how a robot handles everyday debris, how efficient it is, and whether it lasts.
With the Dolphin Cayman I zeroed in on the automation, the HyperBrush, and the SmartNav 2.0 navigation. It covered the floor and walls well, though it skips the waterline. Watching its path and efficiency over three months confirmed it as a strong mid-priced robot with features you'd usually only get higher up the range.
"Three months in my pool told me these two robots aren't in the same class."
I put the Proteus DX3 through the same paces to see how its floor and wall cleaning stacked up. It's a strong vacuum, but it doesn't clean the waterline, and the missing NanoFilters are a real drawback. There's also the hidden restocking fee a lot of owners mention. I didn't hit it during testing, but you should know it's out there.
My coverage tests are strict. I watch how each robot navigates, where it goes, and what it misses. The Cayman impressed me with SmartNav 2.0, moving through my pool smoothly and covering it precisely. It doesn't clean the waterline, but it works the floors and walls well, which makes it a strong pick in its price range.
The Proteus DX3 also covered floors and walls nicely. But no waterline cleaning and no nano filtration took the shine off. For a similar price, the Cayman simply gives you more in features and function, which makes it the better buy overall.
Over the three months I dug into filtration too. The Cayman's MaxBin with optional NanoFilters filtered beautifully, catching fine debris and keeping the water clear. The Proteus DX3's standard filter let finer particles and sediment slip past, the exact stuff the Cayman's NanoFilters grabbed with no trouble.
On scheduling and ease of use, the Cayman's Weekly Timer stood out. It automates the whole cleaning schedule, so I could set it once and trust that the pool stayed clean all week without touching it again.
The Proteus DX3 wasn't as easy to live with. Its vacuum power and floor coverage are good, but without an easy weekly timer and NanoFilters, it fell behind on the day-to-day experience. And the hidden restocking fee that owners keep flagging raises the question of what a return might actually cost you.
My recommendation is straightforward. Both the Dolphin Cayman and the Proteus DX3 have their strengths, but the Cayman wins on usability, convenience, and value for the price. If you want stronger filtration and a robot that cleans every part of the pool, look at the Dolphin Quantum, Dolphin Premier, or Dolphin Sigma for their extra features and performance.
With this testing method and the time I put into each robot, my reviews stay honest and useful so you can pick the right one for your pool. Always weigh the warranty, the features, and the hidden costs before you decide.
For more comparisons and a full look at the top robots, check out my reviews of the best pool robots of the year.
Coverage
Put the Dolphin Cayman up against the Dolphin Proteus DX3 on coverage and the differences are big. The Cayman is known for its full cleaning coverage, moving from floors to walls without a fuss. Its SmartNav 2.0 system plans a calculated path so it isn't wasting time going over the same spots.
The Proteus DX3 covers less because it won't clean the waterline. It handles floors and wall surfaces well, but its navigation isn't as sharp. It does move on a calculated path, but it doesn't have the advanced navigation or climbing the Cayman does.
In my testing the Cayman really shone at scrubbing debris off both floors and walls. Its HyperBrush and Hypergrip tracks do a lot of the work, gripping the surface firmly and lifting debris the way I want a robot to.
"The Cayman's tech means it actually cleans the whole surface, not just parts of it."
The Proteus DX3, running standard brushes and filters, did fine on floors and walls. But without the Cayman's SmartNav 2.0 and HyperBrush, it wasn't as effective. It lacks that precision and scrubbing power, so it left the occasional spot behind.
The scores back this up. The Dolphin Cayman earned a 10 for coverage, which speaks to how well it works floors and walls. With precise navigation and real scrubbing power, it gives me a full clean every time.
The Proteus DX3 scored an 8 for coverage. It does floors and walls solidly, but the missing waterline cleaning and the lack of advanced features hold it back. It couldn't match the Cayman's coverage, which is why it lands a step lower.
On coverage, the Dolphin Cayman clearly comes out on top. Its features add up to a thorough clean across every surface. The Proteus DX3 is dependable but can't match that, which makes the Cayman the better tool for keeping the pool clean.
If you want the best coverage and every part of the pool cleaned, the Dolphin Cayman is the one. And if full coverage is your priority, robots like the Dolphin Premier, Dolphin Sigma, or the Cayman itself are the way to go for a complete clean.
Filters
Comparing the filters on the Dolphin Cayman and the Dolphin Proteus DX3, a few clear differences turn up. The Cayman has the versatile MaxBin plus optional NanoFilters, while the Proteus DX3 runs a standard fine filter basket. That difference in filter tech shapes how well each one grabs debris.
The MaxBin in the Cayman holds over 50% more than first-generation Dolphin filters. That extra room lets it deal with all kinds of debris, from big leaves down to fine particles, and keep the water looking clear. The optional NanoFilters take it further, catching fine stuff like sand, algae, and dirt that a standard filter would let through.
"The Cayman's MaxBin and NanoFilters together give you filtration nothing else here matches."
The Proteus DX3 leans on a standard fine filter basket. It's fine for everyday debris but comes up short on finer particles. With just the one filter type it's less flexible, and without a NanoFilter option it sometimes struggles with cloudier water and fine sediment that need more specialized filtration.
On debris capture, the Cayman's MaxBin and NanoFilters grab both the big stuff, like leaves and twigs, and the fine particles that cloud the water. That range makes it genuinely useful for keeping a pool consistently clean. The Proteus DX3's standard basket is reliable but doesn't cover the same range.
The filter scores make the gap plain. The Dolphin Cayman earns a 10, its filtration system doing a great clean with barely any manual work from me. The Dolphin Proteus DX3 scores a 6. It's fine for typical debris, but it can't match the Cayman.
On filtration the Dolphin Cayman is the clear winner. The MaxBin plus optional NanoFilters give it strong, flexible filtration that grabs a wide range of debris. If you want versatile, powerful filtration, the Cayman is the pick.
For a deeper look at the top robots I've tested, my best pool robots of the year list breaks down the leading models on the market.
Feature Set
Comparing what the Dolphin Cayman and the Dolphin Proteus DX3 actually offer, some real differences show up. The Cayman leads with its Weekly Timer, which automates cleanings. That one feature already sets it apart from a lot of robots in its price range.
The Proteus DX3 has a timer too, so I could set cleaning schedules. And it doesn't stop there. It cleans floors and walls well, giving you a thorough job even if it's less automated than the Cayman.
The Cayman pulls further ahead with SmartNav 2.0 navigation and HyperBrush technology. Together they let it cover my pool efficiently and scrub off stuck-on debris. I could watch that navigation keep it from doubling back as it worked the whole pool.
The Proteus DX3 has no HyperBrush and uses standard brushes. They work, but they don't clean as deeply. Its path is also less refined without SmartNav 2.0, so it can miss a spot or clean the same area twice.
"The Cayman automates the whole thing, and that's what makes pool care easy."
On usability, the Cayman's touches like the easy-to-remove MaxBin and optional NanoFilters keep maintenance simple. They also sharpen its filtration, so even the finest particles get caught.
The Proteus DX3 has a standard filter basket but no NanoFilters, which limits how much fine debris it catches. That makes the Cayman the more flexible, more powerful choice, especially if you need serious filtration.
Warranty matters too. The Cayman comes with a competitive 2-year warranty backed by Maytronics support, so if something goes wrong, it gets sorted quickly. That's a real plus for the ownership experience.
The Proteus DX3 also has a 2-year warranty. The catch is that hidden restocking fee owners keep reporting, which can run up to 50% of the price on a return. That makes it a costlier robot to deal with over time.
"A restocking fee you didn't see coming can quietly wreck a robot's value."
So on features, the Dolphin Cayman scores higher at 4.5/5, thanks to SmartNav 2.0, HyperBrush, the MaxBin, and optional NanoFilters. That combination makes it easier to use and more efficient.
The Proteus DX3, dependable and with a programmable timer, scores 2/5, mostly because of the thinner feature set and that hidden restocking fee. That makes the Dolphin Cayman the smarter buy, with more value and a better clean.
If you want something even more advanced, the Dolphin Premier or the Dolphin Sigma are worth a look for their extra features and longer warranties.
Conclusion
After all my testing, both the Dolphin Cayman and the Dolphin Proteus DX3 have clear strengths and clear weaknesses. The Dolphin Cayman shines on automation, efficient cleaning paths, and extras like the Weekly Timer and HyperBrush. Those add up to an impressive overall score of 9.4.
"The Cayman just cleans the whole pool, and it does it without me hovering over it."
The Dolphin Proteus DX3, dependable and capable as it is, comes up short next to the Cayman. No NanoFilters, no waterline cleaning, and that hidden restocking fee owners keep flagging leave it with an overall score of 6.
Weighing it all, the Dolphin Cayman is the clear winner head to head. Its better clean, stronger features, and solid value make it the smarter buy. If you want to go further still, robots like the Dolphin Quantum, Dolphin Premier, or Dolphin Sigma are worth a look for their extra features and higher performance.
"For what it costs, the Cayman gives you a lot of cleaning tech that actually earns its keep."
All told, the Dolphin Cayman comes out ahead on its full clean, easy operation, and strong automation. It's the one I'd point most pool owners toward for a pool that stays clean without the hassle.
Alternate Robots
If you want top-performing options beyond the Dolphin Cayman and Dolphin Proteus DX3, a few robots I've tested are worth your time. Each one does something a little different depending on what your pool needs.
The Dolphin Premier is one of the best cleaners I've run. Its multi-media filtration, including an oversized leaf bag and NanoFilters, handles all kinds of debris. It cleans thoroughly and reaches the waterline thanks to dual scrubbing brushes and strong DC motors. Add the weekly timer and Media-Alert and you get a robot you can basically forget about while it does the work.
"If you want the whole pool cleaned and no fuss, the Premier is the one I reach for."
Another strong option is the Dolphin Sigma. It's part of the Dolphin ProLine, with commercial-grade motors and a gyroscope that make it seriously efficient. The Sigma includes both standard and ultrafine filters, so even the finest particles get caught. App connectivity, a programmable scheduler, and a three-year warranty make it one of the best robots I've tested.
If you want strong features at a more competitive price, the Dolphin Quantum is a great pick. It has a larger XXL MaxBin and NanoFilters that grab a wide range of debris for clear water. Its SmartNav 2.0 navigation and Powerjet 3D mobility cover the pool efficiently, which makes it a really capable all-rounder.
Of these, the Dolphin Premier lines up most directly against the Cayman and Proteus DX3. Its features and flexible filtration make it the pick if you want a thorough, hands-off clean.
For more comparisons and a closer look at the best robots I've tested, my reviews of the best pool robots of the year break down the top models on the market.