Help me choose
A stronger Pool Express option
Dolphin Liberty 300 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.
Liberty
Dolphin Liberty 300
Inground and above-ground pools that need floor and wall cleaning, with fine debris, without a power cord.
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 CaymanDolphin Liberty 300 or Niya Sonar 20: our take
Dolphin Liberty 300 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
Dolphin Liberty 300 is intended for inground and above-ground 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. Dolphin Liberty 300 cleans floor and walls; Niya Sonar 20 cleans floor. Dolphin Liberty 300 lists Dual DC motors. Niya Sonar 20 lists Sonar navigation and Dual drive motors.
Filtration and debris
Dolphin Liberty 300 includes Basket and UltraFilter; Niya Sonar 20 includes Basket. That gives Dolphin Liberty 300 the clearer documented edge for fine silt, pollen and sand.
Controls and day-to-day ownership
Dolphin Liberty 300 provides no fully published timer, app or remote specification; Niya Sonar 20 provides one-touch starts and power-supply controls. Both use cordless battery power.
Price, warranty and the decision
Dolphin Liberty 300 is listed at $1,099 and Niya Sonar 20 at $199; Niya Sonar 20 is $900 less. Dolphin Liberty 300 lists a 2-year warranty compared with 1 years for Niya Sonar 20. Dolphin Liberty 300 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 | Dolphin Liberty 300 | Niya Sonar 20 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | YesEdge | No |
| Scrubs the waterline | No | No |
| Fine-debris filter included | YesEdge | No |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | Not listed | No |
| Smartphone app | Not listed | No |
| Anti-tangle swivel | Not listed | Not listed |
| 3-year warranty | No | 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 300 stands out
Dolphin Liberty 300 is the better fit for inground and above-ground pools that need floor and wall cleaning, with fine debris, without a power cord.
- Adds wall climbing and scrubbing
- Includes filtration for sand, pollen and other fine debris
- 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 $900 lower
- Cleans the pool floor
Dolphin Liberty 300 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 | Dolphin Liberty 300 | Niya Sonar 20 |
|---|---|---|
| Best fit | Inground and above-ground pools that need floor and wall cleaning, with fine debris, without a power cord. | Above-ground pools up to 26 ft that need the floor cleaned without a cord. |
| Starting price | $1,099 | $199 |
| Pool type | Inground, Above-ground | Above-ground |
| Maximum pool length | Not listed | Up to 26 ft |
| Cleaning coverage | Floor, Walls | Floor |
| Power | Cordless | Cordless |
| Filtration | Basket, UltraFilter | Basket |
| Scheduling | Not listed | One-touch start |
| App and remote | Not listed | Power-supply controls |
| Cable | Cordless | Cordless |
| Robot weight | Not listed | 10 lb |
| Warranty | 2 years | 1 years |
Consider the stronger Pool Express option
Dolphin Liberty 300 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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