Help me choose
A stronger Pool Express option
Blue Helix One and Dolphin S50 are compared feature by feature below. For a stronger Pool Express option, consider Dolphin Cayman. Inground and above-ground pools up to 40 ft that need floor and wall cleaning.
Blue Helix
Blue Helix One
Inground pools that need floor, wall and waterline cleaning.
What we recommend instead
Dolphin Cayman
Inground and above-ground pools up to 40 ft that need floor and wall cleaning.
$1,079
Buy Dolphin CaymanBlue Helix One or Dolphin S50: our take
Blue Helix One and Dolphin S50 are compared on pool fit, cleaning reach, debris handling, controls and ownership details. The recommendation is based on the job the robot must do—not a simple feature count.
Pool fit and cleaning reach
Blue Helix One is intended for inground pools, while Dolphin S50 is intended for above-ground pools. Dolphin S50 has a published maximum pool length of 30 ft; the other model does not have a verified length in our source material. Blue Helix One cleans floor, walls, and waterline; Dolphin S50 cleans floor. Dolphin S50's documented cleaning system includes 1 active brush.
Filtration and debris
Both models include Basket.
Controls and day-to-day ownership
Blue Helix One provides a weekly timer and smartphone control; Dolphin S50 provides one-touch starts and power-supply controls. Blue Helix One uses continuous corded power, while Dolphin S50 uses a 40 ft corded cable.
Price, warranty and the decision
Blue Helix One is listed at $579 and Dolphin S50 at $649; Blue Helix One is $70 less. Each lists a 2-year manufacturer warranty. Blue Helix One and Dolphin S50 each have a specific fit, but neither is the Pool Express pick for this job. Our better alternative is Dolphin Cayman. Inground and above-ground pools up to 40 ft that need floor and wall cleaning.
Feature check: what each robot actually has
A green check means the feature is documented as included. A red X means it is documented as absent. A dash means the source does not make the feature clear.
| Feature | Blue Helix One | Dolphin S50 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | YesEdge | No |
| Scrubs the waterline | YesEdge | No |
| Fine-debris filter included | No | No |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | YesEdge | No |
| Smartphone app | YesEdge | No |
| Anti-tangle swivel | Not listed | Not listed |
| 3-year warranty | No | No |
| No recharging between cycles | Yes | Yes |
| Built-in UV-C water treatment | No | No |
Unknown is not treated as “no.” Specifications come from the product pages, current catalog records and manufacturer material collected for this site.
Where Blue Helix One stands out
Blue Helix One is the better fit for shoppers prioritizing the lower $579 starting price.
- Cleans the floor, walls and waterline instead of stopping below the tile line
- Can start on a weekly schedule without a manual launch before every cycle
- Adds smartphone control
- Is listed $70 lower
Where Dolphin S50 stands out
Dolphin S50 is the better fit for above-ground pools up to 30 ft that need floor cleaning.
- Cleans the pool floor
- 40 ft cable
Blue Helix One vs Dolphin S50 specifications
Use pool fit first. Price and app control do not make up for a robot that cannot cover the length or surfaces you need cleaned.
| Specification | Blue Helix One | Dolphin S50 |
|---|---|---|
| Best fit | Inground pools that need floor, wall and waterline cleaning. | Above-ground pools up to 30 ft that need floor cleaning. |
| Starting price | $579 | $649 |
| Pool type | Inground | Above-ground |
| Maximum pool length | Not listed | Up to 30 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor |
| Power | Corded | Corded |
| Filtration | Basket | Basket |
| Scheduling | Weekly schedule + app | One-touch start |
| App and remote | App control | Power-supply controls |
| Cable | Not listed | 40 ft |
| Robot weight | Not listed | 14 lb |
| Warranty | 2 years | 2 years |
Consider the stronger Pool Express option
Blue Helix One and Dolphin S50 are compared feature by feature below. For a stronger Pool Express option, consider Dolphin Cayman. Inground and above-ground pools up to 40 ft that need floor and wall cleaning.
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