Help me choose
A stronger Pool Express option
Blue Helix One and Niya Sonar 20 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.
Niya Sonar
Niya Sonar 20
Above-ground pools up to 26 ft that need the floor cleaned without a cord.
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 Niya Sonar 20: our take
Blue Helix One and Niya Sonar 20 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 Niya Sonar 20 is intended for above-ground pools. Niya Sonar 20 has a published maximum pool length of 26 ft; the other model does not have a verified length in our source material. Blue Helix One cleans floor, walls, and waterline; Niya Sonar 20 cleans floor. Niya Sonar 20's documented cleaning system includes Sonar navigation and Dual drive motors.
Filtration and debris
Both models include Basket.
Controls and day-to-day ownership
Blue Helix One provides a weekly timer and smartphone control; Niya Sonar 20 provides one-touch starts and power-supply controls. Blue Helix One uses continuous corded power, while Niya Sonar 20 uses cordless battery power.
Price, warranty and the decision
Blue Helix One is listed at $579 and Niya Sonar 20 at $199; Niya Sonar 20 is $380 less. Blue Helix One lists a 2-year warranty compared with 1 years for Niya Sonar 20. Blue Helix One and Niya Sonar 20 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 | Niya Sonar 20 |
|---|---|---|
| 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 | YesEdge | No |
| 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 owners who put smartphone control first.
- 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
- Carries a 2-year warranty instead of 1 years
Where Niya Sonar 20 stands out
Niya Sonar 20 is the better fit for shoppers prioritizing the lower $199 starting price.
- Is listed $380 lower
- Cleans the pool floor
Blue Helix One vs Niya Sonar 20 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 | Niya Sonar 20 |
|---|---|---|
| Best fit | Inground pools that need floor, wall and waterline cleaning. | Above-ground pools up to 26 ft that need the floor cleaned without a cord. |
| Starting price | $579 | $199 |
| Pool type | Inground | Above-ground |
| Maximum pool length | Not listed | Up to 26 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor |
| Power | Corded | Cordless |
| Filtration | Basket | Basket |
| Scheduling | Weekly schedule + app | One-touch start |
| App and remote | App control | Power-supply controls |
| Cable | Not listed | Cordless |
| Robot weight | Not listed | 10 lb |
| Warranty | 2 years | 1 years |
Consider the stronger Pool Express option
Blue Helix One and Niya Sonar 20 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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