1.9 PSI versus 1.5. The newest robot in Dolphin’s ProLine against the hidden gem of the Max-Series — and here’s what makes this one interesting. The cheaper robot just matched a $2,099 cordless flagship from another brand in my test.
Both are Dolphins. Both clean on a weekly timer without you lifting a finger. And the price gap between them is real.
So today I’m settling the question I get constantly in the comments: is the Quantum Pro worth the jump — or is the Cayman all the robot most pools actually need? I’ve had both in our pool for weeks. So let’s dive in.
Hey guys, I’m Ryan with ActuallyUsed, where we put the products to the test so you don’t have to. Every robot that comes through here gets weeks in a real pool with real messes, and every single one gets hooked up to my hydro manometer — the device that measures actual suction pressure right at the intake port. Today it’s: Dolphin versus Dolphin, ProLine versus Max-Series.
How I Test — and Why PSI, Not GPH
Quick refresher if you’re new. Manufacturers publish GPH — gallons per hour moving through the pump. I measure PSI at the intake port — how hard the robot pulls when it rolls over sand, silt, and acorns.
Both numbers are real; they just answer different questions, and I’m not saying the brands quoting big flow numbers are being dishonest — they’re measuring something different than I am. In my experience, PSI is the number that decides whether your floor actually comes clean. My logbook now covers manometer readings on more than two dozen robots, plus tape-measured intake ports on over 40. That’s the ruler for today’s fight.
Meet the Contenders
In one corner: the Dolphin Quantum Pro, the 2026 addition to Dolphin’s ProLine and the replacement for the original Quantum. It brings the MyDolphin Plus app, sun shelf and step cleaning, NanoFilters in the box, the XXL MaxBin, and an anti-tangle swivel cable.
In the other corner: the Dolphin Cayman, the hidden gem of Dolphin’s Max-Series. No app, no frills — just a weekly timer, a top-loading MaxBin, the HyperBrush, and one of the best price-to-performance ratios I’ve found in this entire category.
Same brand. Different tiers.
ProLine vs. Max-Series
Quick lineup decoder, because Dolphin’s naming trips people up.
The ProLine is the premium, commercial-grade tier — the Premier, the Sigma, and now the Quantum Pro. These share DNA with Dolphin’s Wave commercial cleaners, the ones that sell for thousands to public pools and resorts: stronger motors, better wall climbing, longer-lasting components.
The Max-Series is the value tier — the Cayman, the Escape, and the Quantum. Yes – the Quantum is a part of both line ups. Still excellent robots at a friendlier price. And they have features like the HyperBrush and more importantly the MaxBin – which is why the Quantum is in the Max-Series. So on paper, this fight is over before it starts. In the water, the Cayman makes it a lot closer than the badge suggests.
Round 1 — Suction
With the manometer sealed on the intake port, the Quantum Pro peaked at 1.9 PSI in my testing. The Cayman pulled 1.5 — same pool, same gauge, same method.
Both of those numbers deserve context. The Quantum Pro’s 1.9 is one of the strongest readings I have ever logged — only the very top of my leaderboard has pulled more, robots like the Premier at 2.2 and the Sigma at 2.0, and every one of them costs more than the Quantum Pro. Nothing battery-powered in my logbook has touched it.
And the Cayman’s 1.5? Here’s the stat that made me smile: that is the exact same number the Beatbot AquaSense 2 Pro posted on my gauge — a $2,099 cordless flagship. The Cayman matched it for a fraction of the price, with no battery to babysit. That’s why I keep calling this robot the hidden gem of the lineup.
| Robot | Tested PSI (my gauge) | Type |
|---|---|---|
| Dolphin Premier | 2.2 | Corded — ProLine |
| Dolphin Sigma | 2.0 | Corded — ProLine |
| Dolphin Quantum Pro | 1.9 | Corded — ProLine (today) |
| Beatbot AquaSense 2 Pro | 1.5 | Cordless — $2,099 flagship |
| Dolphin Cayman | 1.5 | Corded — Max-Series (today) |
| Dolphin Escape | 1.5 | Corded — Max-Series |
Starting from the strongest suction on this list: the Dolphin Premier at 2.2 PSI, the Dolphin Sigma at 2.0, then the Quantum Pro at 1.9 — and after the gap, a cluster at 1.5 where the Cayman, the Escape, and that $2,099 Beatbot all sit together. In the pool, the difference between 1.9 and 1.5 shows up on the fine stuff — silt, algae dust, pollen. In my testing, the Quantum Pro grabbed it on the first pass more consistently; the Cayman sometimes needed a second lap. Call it about 27 percent more pull, and you can see it work.
Round one: Quantum Pro.
Round 2 — Coverage, Capacity, and Reach
Suction is half the equation. The other half is the bite — and the reach.
Start with the intake. The Cayman runs a five-inch single port; I’ve had the tape on it. The Quantum Pro runs a single center port as well, measuring 7 inches on my tape.
Why does the bite matter? Coverage math. A wider path and a bigger basket mean fewer passes to sweep the same floor and fewer pit stops to empty debris — and in my experience, that’s the difference between a robot that finishes the job and one that circles back for what it missed.
Then the basket. The Quantum Pro carries the XXL MaxBin — a top-loading basket that holds way more debris than most robots I’ve tested. The Cayman runs Dolphin’s second-generation MaxBin: same top-loading convenience, noticeably smaller capacity. In practice, that means the Cayman needs emptying more often when the debris load picks up, while the Quantum Pro just keeps working.
And the reach. The Cayman ships with a 50-foot cord and no swivel, which rates it for pools up to about 35 feet. The Quantum Pro brings the anti-tangle swivel cable — zero tangles in my testing — and handles pools up to roughly 50 feet. If your pool is big, this round alone makes the decision for you.
Round two: Quantum Pro.
Round 3 — The App
Here’s the cleanest split between these two. The Quantum Pro runs the MyDolphin Plus app — and in my testing, it held its connection while the robot was underwater. That’s rare: every cordless robot app I’ve tested, Beatbot and Aiper included, dropped the second the robot submerged. With the Quantum Pro, I started cycles, switched modes, spot-cleaned trouble areas, and steered it around from the couch, mid-clean. It’s the same app the Sigma uses, and it’s the best pool robot app I’ve used. The Cayman has no app at all. None.
Now — and this matters — the Cayman is not dumb. It runs the same weekly timer automation off the power supply: set the schedule once, and it cleans on the days you picked without you touching it. That’s the feature that actually changes your life, and both robots have it. One is through an app and one is through the power supply.
The app is the layer on top: remote control, spot cleaning, scheduling from your phone. If you’d never open the app anyway, this round means nothing to you. If you want your pool robot on your phone, only one of these delivers.
Round three: Quantum Pro.
Round 4 — What’s in the Box: Filtration
This one surprises people. Both of these robots support Dolphin’s NanoFilters — the ultra-fine pleated cartridges that are still the best filtration I’ve tested on any robot. Shine a light through a standard mesh screen and you can see what’s going to slip through; the NanoFilters grab particles those screens don’t even see.
The difference is the box. The Quantum Pro includes them — NanoFilters and standard mesh, both in there on day one. On the Cayman, the NanoFilters are an optional add-on you buy separately. That’s not a small thing: in my experience, the NanoFilters are the single biggest water-clarity upgrade you can make on a Dolphin, and one of these robots makes you pay extra for it. Factor that into the real price gap when you’re comparing the two.
Another VERY important part for filtration is the Quantum’s XXL MaxBin vs Cayman’s MaxBin. The Quantum’s basket is larger, allowing it to pick up more debris. It is 400 sq inches vs 225 sq inches.
Round four: Quantum Pro.
Round 5 — Waterline and Shallow Water
The waterline is where most robots give up, and it’s where these two split again. The Cayman climbs walls — no complaints there in my testing — but it won’t move horizontally along the waterline, so that gray ring of sunscreen and body oils at the tile line stays your job. The Quantum Pro grips the walls and the waterline aggressively in my testing — it doesn’t just touch the tile line, it works it.
And then the shallow end. The Quantum Pro is built to clean sun shelves, baja ledges, and pool steps — rated for water as shallow as around 12 inches. In my testing, it climbed my steps, worked the shallow ledge, and came back down on its own. The Cayman doesn’t attempt any of that. If your pool has a shelf you’ve been hand-brushing every Saturday, this is the round that ends the debate.
Round five: Quantum Pro.
Round 6 — Value and Simplicity
So it’s a shutout, right? Not so fast — because the Cayman’s round is the one most pool owners actually live in.
Look at what your money buys here. The same HyperBrush active scrubbing, spinning about twice as fast as a standard brush and visibly working the floor. The same top-loading basket design — lift, dump, rinse, done. The same weekly timer automation that took me from 14 robot interactions a week with cordless units down to one. And a 1.5 PSI reading that matches a $2,099 cordless flagship — for a fraction of the money.
If your pool is on the smaller side, doesn’t drown in debris, and has no shelf to worry about, the Cayman gives you the entire corded-automation experience — the part that actually changes your weekends — and lets you keep the difference. In my opinion, dollar for dollar, it’s one of the best values in the industry. And that’s not me being sentimental about the underdog; the gauge says so.
Round six: Cayman, decisively.
What They Share — The Corded Advantage
Before the verdict, the thing these two share matters more than anything separating them: the cord. A cordless robot means fishing it out, hauling it to the charger, and dropping it back in — every day. Call it 14 separate interactions a week. Either of these robots on the weekly timer? One. You rinse a filter once a week, and that’s the whole relationship.
And here’s my time math, because time is the whole reason to buy a robot. Manual vacuuming and brushing ran me one to two hours a week. A cordless robot needs about ten minutes of handling every day — call it 70 minutes a week. Either of these needs about ten minutes once a week. By my math, that’s an hour or more back every week, and north of 40 hours a year — from either robot in this comparison.
And on raw pull, the strongest cordless readings in my logbook cluster right around where the Cayman sits — and the Quantum Pro clears them all. My theory, and it’s the same thing you’ve felt with a cordless stick vacuum at home, is that battery-powered suction has a ceiling. How much cordless suction fades as the battery drains is exactly what my drain-down test is measuring right now — subscribe if you want those numbers the day they’re ready.
The Knocks on Each
Quick knocks on both. The Quantum Pro’s is simple: it costs more, and if your pool is small, simple, and shelf-free, you may be paying for muscle and features you’ll never use. The Cayman’s list is longer but smaller: no app, no swivel on the cord, a five-inch port, a smaller basket, NanoFilters sold separately, and a hard ceiling around 35-foot pools. None of those are dealbreakers for the right pool. All of them are the reason the Quantum Pro exists.
The Spec Sheet, Side by Side
| Category | Dolphin Cayman | Dolphin Quantum Pro |
|---|---|---|
| Tested PSI (my gauge) | 1.5 | 1.9 |
| Intake path (my tape) | 5 in. single port | 7 in. single center port |
| Debris basket | MaxBin (2nd gen), top-loading — 225 sq in. | XXL MaxBin, top-loading — 400 sq in. |
| Filtration in the box | Standard mesh; NanoFilters optional add-on | NanoFilters + standard mesh included |
| Smart app | None — timer control only | MyDolphin Plus — works underwater |
| Weekly timer on power supply | Yes | Yes |
| Cable | 50 ft, no swivel | Anti-tangle swivel |
| Pool size rating | Up to ~35 ft | Up to ~50 ft |
| Waterline / shallow water | Climbs walls; no waterline tracking, no shelves | Works the waterline; shelves and steps, ~12 in. of water |
| Warranty | 2 years | 2 years |
| Price | ~$1,079 MSRP | $2,499 MSRP |
| The pick for | Smaller pools, best value, simplicity | Bigger/modern pools, shelves, app control |
The Verdict
Six rounds: five for the Quantum Pro, one for the Cayman. But I’ve been doing this long enough to tell you the score isn’t the story.
The better robot is the Quantum Pro, and it isn’t close. More pull on the gauge, larger filter, more reach, the best pool robot app I’ve used, the best filters I’ve tested in the box on day one, and the sun shelf cleaning almost nothing else will even attempt. If your pool is bigger, messier, or more modern — or you just want the machine that does everything — buy the Quantum Pro and don’t look back.
But the better buy? For a lot of you, it’s still the Cayman. If your pool is under about 35 feet, doesn’t get hammered with debris, and has no shelf, the Cayman delivers the part of this whole category that actually matters — strong corded suction on a weekly timer — for meaningfully less money. Based on my results, most smaller pools would never feel the difference day to day. Just add the NanoFilters to the cart; that’s the one upgrade I wouldn’t skip.
So: best machine, Quantum Pro. Best value for a smaller, simpler pool, Cayman. Around here, we let the gauge pick the winner and your pool pick the buy.
Who Should Buy Which
Buy the Quantum Pro if your pool runs up to 50 feet, has a sun shelf or steps, collects real debris, or you want app control and the best filtration in the box. Buy the Cayman if your pool is under about 35 feet, your debris load is normal, and set-it-and-forget-it automation at the best possible price is the goal. Buried in leaves? That’s Premier territory. Want the maxed-out flagship with every feature Dolphin makes? That’s the Sigma — and I’ve got full reviews of both.
The best deals I can find on both of these are on the deals page, and the full deep-dives are in my Cayman review and Quantum Pro review. The cordless battery drain-down video is up next — subscribe so you don’t miss it. Got a robot you want on the manometer? Tell me in the comments. Thanks for watching — I’ll catch you on the next one!
