Head-to-Head Comparison
Dolphin Sigma vs Dolphin Cayman
Our pool experts compare features, filtration, specs, and value to help you pick the right robotic pool cleaner.
Dolphin Cayman or Dolphin Sigma — which wins?
Our pick: the Dolphin Sigma
Diving into the Dolphin Sigma vs Dolphin Cayman, our pool experts weigh filtration, cleaning coverage, smart features, and value. For most pools, the Dolphin Sigma is the robot we recommend — and right now you save $500.
What Sets Them Apart
Key Differences
Sigma
- Includes NanoFilters™ - Captures small debris other cleaners miss
- Waterline Cleaning - Cleans the pool floor, wall, & waterline
- Triple Commercial Grade Motors - 3 ProLine Motors filter 4500 GPH+
- myDolphin Plus App - Schedule and clean the Sigma from anywhere
- Gyroscope - Gyroscopic sensors control and monitor every movement
- 3 Year Warranty - Longest warranty available
Cayman
- Best Pool Robot Under $800 with NanoFilter™ capability, Weekly Timer, HyperBrush, and Wall Climbing.
- MaxBin™ is larger and easier to clean than filter cartridges
- Wall Climbing - Complete floor and wall coverage
- FREE NanoFilters with purchase using code at checkout: DEEPCLEAN23
- Weekly Timer - Schedule the robot to automatically clean
- HyperBrush - Scrubs 2X the speed of standard Dolphin robots
Side by Side
Feature Comparison
The features that matter most when comparing the Dolphin Sigma and Dolphin Cayman.
| Feature | SigmaOur Pick | Cayman |
|---|---|---|
| Standard Filter | ||
| NanoFilters™ | Optional | |
| Wall Climbing | ||
| Waterline Cleaning | ||
| Programmable Weekly Timer | ||
| Gyroscope Navigation | ||
| Dual Stabilizer | ||
| Anti-Tangle Swivel | ||
| 3-Year Warranty |
Explained
Compare Features in Detail
NanoFilters™
Often overlooked, a NanoFilter™ can be the most important part of a pool robot. Without it, microscopic particulate — fine dust, pollen, and algae — passes right through the standard filters found on most robots. These ultra-fine filters trap that debris for a noticeably cleaner, healthier pool. On some models NanoFilters are included; on others (like the Escape and Cayman) they're an inexpensive optional add-on. Learn more ›
Programmable Weekly Timer
An automatic pool cleaner should be automatic. A programmable weekly timer sets the robot to clean on a schedule — every day, every other day, or a few times a week — without you turning it on and off.
Dual Stabilizer
Essential for waterline cleaning, dual stabilizers let the unit cling to the walls for a more precise, deeper clean at the waterline — with increased agility and an easy pickup handle.
Anti-Tangle Cable Swivel
Say goodbye to tangled cords. An anti-tangle swivel lets the robot move 360° around your pool without the cord getting tangled, so you can sit back while it cleans. Learn more ›
Warranty Coverage
A robot is only as good as its warranty. The Dolphin Sigma is backed by a 3-year warranty, while the Dolphin Cayman carries a 2-year warranty. Buying through an Authorized Dealer like Poolbots gets you the full manufacturer warranty — never pro-rated or limited by cleaning cycles — plus a 30-day in-pool trial with no restocking fees. Learn more ›
Watch
Videos
See the Dolphin Sigma and Dolphin Cayman in action.
The Details
Specifications
| Sigma | Cayman | |
|---|---|---|
| Part Number | 99991036-SPLI | 99996135-SPL |
| Waterline Cleaning | Yes | No |
| Multi-Media® | No | No |
| Filters Included | 2 | 1 |
| Filter Cleaning | Ultra-fine NanoFilters and Standard Filter Cartridge sets | MaxBin |
| Cleaning Coverage | Floor, Walls, Waterline | Floor, Walls |
| Cleaning Cycle | 2.5 hours | 1.5 hours |
| Number of Brushes | 4 | 1 |
| Cable Length | 60 ft | 36 ft |
| Anti-Tangle Swivel | Yes | No |
| Pool Types | In Ground | In Ground & Above Ground |
| Maximum Pool Size | 50 ft | 33 ft |
| Pool Shape | Rectangle, Oval, or Freeform | Rectangle, Oval, or Freeform |
| Obstacles | Steps, Ladder, Drain Cover, Ledges, Pop-Ups | Steps, Ladder, Drain Cover, Ledges, Pop-Ups |
| Surface | Concrete, Plaster, Gunite, Pebble, Tile, Vinyl Liner, Fiberglass | Concrete, Plaster, Gunite, Pebble, Tile, Vinyl Liner, Fiberglass |
| Media-Alert® | No | No |
| Automated Weekly Timer | Yes | Yes |
| Remote Operation | Yes - Through App | No |
| Restocking Fee | No | No |
| Warranty | 3 Years | 2 Years |
Go Deeper
Read Our Expert Reviews
Our in-depth reviews are written by pool experts to help you make an informed decision.
Dolphin Sigma
Read Dolphin Sigma ReviewDolphin Cayman
Read Dolphin Cayman ReviewKeep Comparing
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What’s Next?
Still narrowing it down? These expert guides and tools make it easy to find the right pool robot for your pool — most ship free, same day.
Pool Robot Buying Guide
Everything to know before you buy your first robot.
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Robot Selector
Answer a few quick questions and get a recommendation.
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Videos
Watch reviews, comparisons, and expert how-tos.
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Pool Volume Calculator
Calculate your exact pool volume to find the right robot.
Read more →Try It in Your Own Pool for 30 Days
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