Help me choose
A stronger Pool Express option
Dolphin Liberty 400 and Niya Sonar Ray are compared feature by feature below. For a stronger Pool Express option, consider Dolphin Quantum. Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
Liberty
Dolphin Liberty 400
Inground and above-ground pools up to 33 ft that need floor, wall and waterline cleaning without a cord.
Niya Sonar
Niya Sonar Ray
Flat-bottomed above-ground and small inground pools up to 26 ft that need the floor cleaned without a cord.
What we recommend instead
Dolphin Quantum
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
$1,649
Buy Dolphin QuantumDolphin Liberty 400 or Niya Sonar Ray: our take
Dolphin Liberty 400 and Niya Sonar Ray 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
Both robots are intended for inground and above-ground pools. Dolphin Liberty 400 is rated for pools up to 33 ft; Niya Sonar Ray is rated up to 26 ft. Dolphin Liberty 400 cleans floor, walls, and waterline; Niya Sonar Ray cleans floor. Niya Sonar Ray's documented cleaning system includes Sonar navigation.
Filtration and debris
Dolphin Liberty 400 includes Basket and UltraFilter; Niya Sonar Ray includes Basket. That gives Dolphin Liberty 400 the clearer documented edge for fine silt, pollen and sand.
Controls and day-to-day ownership
Dolphin Liberty 400 provides a weekly timer and smartphone control; Niya Sonar Ray provides one-touch starts and power-supply controls. Both use cordless battery power. Dolphin Liberty 400 is listed at 17.9 lb versus 7.1 lb for Niya Sonar Ray; that 10.799999999999999 lb difference matters when lifting the robot from the pool.
Price, warranty and the decision
Dolphin Liberty 400 is listed at $1,429 and Niya Sonar Ray at $199; Niya Sonar Ray is $1,230 less. Dolphin Liberty 400 lists a 3-year warranty compared with 1 years for Niya Sonar Ray. Dolphin Liberty 400 and Niya Sonar Ray each have a specific fit, but neither is the Pool Express pick for this job. Our better alternative is Dolphin Quantum. Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
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 | Dolphin Liberty 400 | Niya Sonar Ray |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | YesEdge | No |
| Scrubs the waterline | YesEdge | No |
| Fine-debris filter included | YesEdge | No |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | YesEdge | No |
| Smartphone app | YesEdge | No |
| Anti-tangle swivel | Not listed | Not listed |
| 3-year warranty | YesEdge | No |
| No recharging between cycles | No | 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 Dolphin Liberty 400 stands out
Dolphin Liberty 400 is the better fit for pools up to 33 ft.
- Cleans the floor, walls and waterline instead of stopping below the tile line
- Includes filtration for sand, pollen and other fine debris
- Can start on a weekly schedule without a manual launch before every cycle
- Adds smartphone control
Where Niya Sonar Ray stands out
Niya Sonar Ray is the better fit for shoppers prioritizing the lower $199 starting price.
- Is listed $1,230 lower
- Weighs 7.1 lb versus 17.9 lb
Dolphin Liberty 400 vs Niya Sonar Ray 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 | Dolphin Liberty 400 | Niya Sonar Ray |
|---|---|---|
| Best fit | Inground and above-ground pools up to 33 ft that need floor, wall and waterline cleaning without a cord. | Flat-bottomed above-ground and small inground pools up to 26 ft that need the floor cleaned without a cord. |
| Starting price | $1,429 | $199 |
| Pool type | Inground, Above-ground | Inground, Above-ground |
| Maximum pool length | Up to 33 ft | Up to 26 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor |
| Power | Cordless | Cordless |
| Filtration | Basket, UltraFilter | Basket |
| Scheduling | Weekly schedule + app | One-touch start |
| App and remote | App control | Power-supply controls |
| Cable | Cordless | Cordless |
| Robot weight | 17.9 lb | 7.1 lb |
| Warranty | 3 years | 1 years |
Consider the stronger Pool Express option
Dolphin Liberty 400 and Niya Sonar Ray are compared feature by feature below. For a stronger Pool Express option, consider Dolphin Quantum. Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
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