Dolphin Sigma
$2999
$2349
Save $650
3 years manufacturer warranty
Dolphin Sigma vs Dolphin Liberty 400
A side-by-side comparison of the Dolphin Sigma and Dolphin Liberty 400 — price, filtration, cleaning coverage, brushes and warranty — to help you pick the right Dolphin robotic pool cleaner.
Dolphin Liberty 400
MSRP $1429
3 years manufacturer warranty
| Feature | Sigma | Liberty 400 |
|---|---|---|
| Overview | ||
| Price | $2999$2349 | MSRP $1429 |
| Lineup | ProLine™ | Liberty™ (cordless) |
| Best for | The most advanced clean | Cordless |
| Pool size | Up to 50 ft | Up to 33 ft |
| Cleaning coverage | Floor + Walls + Waterline | Floor + Walls + Waterline |
| Cleaning cycle | 2.5 hours | 2.5 hours |
| Suction | 4,500 GPH | Not published |
| Scrubbing brushes | 2 (Active brushes) | Not published |
| Filtration | NanoFilters™ | Fine + ultra-fine filter basket |
| Standout features | ||
| Waterline cleaning | Included | Included |
| 3-year warranty | Included | Included |
| NanoFilters™ included | Included | No |
| App control | Included | Included |
| Anti-tangle swivel | Included | No |
| Corded power | Included | No |
| Commercial-grade motors | Included | No |
| Navigation & ownership | ||
| Navigation | SmartNav 3.0™ with gyroscope | Not published |
| Weekly scheduling | Weekly timer | No weekly timer |
| App control | myDolphin Plus (Wi-Fi and Bluetooth) | myDolphin™ Plus app |
| Cable | 55 ft with anti-tangle swivel | None (cordless) |
| What is included |
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| Warranty | 3 years | 3 years |
Dolphin Sigma vs Dolphin Liberty 400: how they compare
The Dolphin Sigma is part of the ProLine™ lineup — the most advanced Dolphin ever, with a gyroscope and app control. It cleans pools up to 50 ft with floor + walls + waterline coverage and NanoFilters™ filtration, backed by a 3-year warranty.
The Dolphin Liberty 400 is part of the Liberty™ (cordless) lineup — a cordless Liberty sold through pool stores with myDolphin™ Plus app control and a 3-year warranty. It handles pools up to 33 ft with floor + walls + waterline coverage and Fine + ultra-fine filter basket filtration, backed by a 3-year warranty.
Our verdict: the Dolphin Sigma wins
The Dolphin Sigma is our pick. As part of the ProLine™ — one of our two top-recommended lineups — it steps ahead of the Dolphin Liberty 400 with floor + walls + waterline coverage, NanoFilters™ filtration and a 3-year warranty.
The Dolphin Liberty 400 lists at a lower MSRP of $1429, but the step up to the Dolphin Sigma buys a meaningfully better clean and longer coverage that's well worth it.
Not sure yet? We're here to help
Every Dolphin Max-Series™ and ProLine™ robotic pool cleaner ships free and is backed by a full manufacturer warranty — explore our top-recommended robots and find the right fit for your pool.
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