We have tested both the Dolphin Cayman and the Dolphin Nautilus CC in real pools, measured their suction at the intake, and lived with the filtration and daily routine each one requires. This comparison brings those results together so you can see the real-world trade-offs without relying on the numbers printed on either box.
Dolphin Cayman and Dolphin Nautilus CC are close enough in the same lineup that the feature and value differences matter as much as the badge.
The short answer: Dolphin Cayman is our pick. It delivers dependable 1.5 PSI corded cleaning, a weekly timer, and an easy top-load basket. Dolphin Nautilus CC still has a clear case: it is the better fit for strict budgets and light debris where basic floor and wall cleaning is enough.
Quick Answer
Buy the Dolphin Cayman when its strengths match your pool. Best for: smaller pools that need set-and-forget cleaning on a sensible budget. It is the stronger choice across the measurements and ownership factors that matter in our testing.
Choose the Dolphin Nautilus CC instead when its narrower advantages matter more to you. Best for: strict budgets and light debris where basic floor and wall cleaning is enough. It removes daily charging from the equation and covers the core floor-and-wall job.
Our calls in the full reviews are Recommended for the Dolphin Cayman and Decent, but there are better buys for the Dolphin Nautilus CC. Those calls matter here: PSI is the first round, not the entire verdict.
Suction Power: 1.5 PSI vs 0.8 PSI
On our hydro manometer, the Dolphin Cayman measured 1.5 PSI and the Dolphin Nautilus CC measured 0.8 PSI. That gives the Dolphin Cayman a 0.7 PSI advantage, or about 87% more intake pressure than the lower reading.
We measure pressure directly at the intake with the same gauge and pool setup. That is different from manufacturer flow-rate claims in gallons per hour: GPH describes water movement, while PSI shows how hard the intake pulls on debris. Cordless results are recorded at full charge. Our complete pool-robot suction test explains the method and shows where both robots sit on the full board.
The number needs context. It delivers dependable 1.5 PSI corded cleaning, a weekly timer, and an easy top-load basket. It removes daily charging from the equation and covers the core floor-and-wall job. The stronger gauge result gets this round, though intake pressure alone cannot make up for a filter that lets fine debris escape or a routine that makes you handle the robot every day.
Filtration and Debris Handling
The Dolphin Cayman uses top-loading maxbin with optional nanofilter panels. The Dolphin Nautilus CC uses basic mesh basket with no nanofilter option.
We give the filtration edge to the Dolphin Cayman. Our comparison favors fine-particle capture, usable debris capacity, easy cleaning, and whether the better filter is included rather than sold as an upgrade.
For leaves, capacity and intake design matter. For pollen, silt, and the haze that dulls otherwise clear water, the filter media matters more. A basic mesh screen can look clean after a run while still passing the smallest material back into the pool.
Automation and Daily Work
The Dolphin Cayman is corded. Weekly timer on the power supply; no app or charging. The Dolphin Nautilus CC is corded. Simple corded start button without a weekly timer.
Because both are corded, neither needs a recharge. The meaningful question is how much scheduling and remote control each power supply or app provides.
The automation round goes to the Dolphin Cayman.
Coverage and Pool Fit
For the Dolphin Cayman, our review found floor and walls in smaller pools, with a compact 50-foot cable. The Dolphin Nautilus CC is built for floor and wall cleaning for standard pools.
Coverage is a tie in our scoring, so choose around pool size, shape, and the surfaces you actually need cleaned.
This is where the runner-up can still be the smarter fit for specific pools. A compact pool does not benefit from paying for reach it cannot use, while a pool with a sun shelf, long waterline, or heavy leaf load can expose the limits of a simpler machine quickly.
Value: Performance for the Money and Time
Our value take on the Dolphin Cayman: One of the strongest price-to-performance buys in the tested group. For the Dolphin Nautilus CC: A basic entry point, but stronger and smarter options cost only a little more.
The value edge goes to the Dolphin Cayman.
Value is not the same thing as the lowest checkout price. We count cleaning power, filtration, how many surfaces the robot covers, and how often you have to retrieve or charge it. A cheaper robot that leaves you vacuuming behind it is not a bargain, and an expensive robot only earns its price when its extra capability solves a real problem in your pool.
Which One Should You Buy?
- Buy the Dolphin Cayman when its strengths fit your pool. Best for: smaller pools that need set-and-forget cleaning on a sensible budget. It delivers dependable 1.5 PSI corded cleaning, a weekly timer, and an easy top-load basket.
- Choose the Dolphin Nautilus CC instead when its specific trade-off fits better. Best for: strict budgets and light debris where basic floor and wall cleaning is enough. It removes daily charging from the equation and covers the core floor-and-wall job.
- Know the main drawback: Dolphin Cayman — It skips app control, an anti-tangle swivel, included NanoFilters, and dedicated shelf cleaning. Dolphin Nautilus CC — Its 0.8 PSI reading, basic mesh, and missing timer put it at the bottom of the corded field.
Final Verdict
Dolphin Cayman wins this comparison. Dolphin Cayman wins the overall matchup. It delivers dependable 1.5 PSI corded cleaning, a weekly timer, and an easy top-load basket. Dolphin Nautilus CC remains the better fit for strict budgets and light debris where basic floor and wall cleaning is enough.
Read the complete Dolphin Cayman review and Dolphin Nautilus CC review for every test photo, setup detail, and long-form ownership note. You can also return to all pool-robot comparisons to see any other matchup from the 19 cleaners in our test set.
