Help me choose
A stronger Pool Express option
Dolphin Liberty 400 and Niya Tracker 55 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 Tracker
Niya Tracker 55
Inground and above-ground pools up to 40 ft that need floor, wall and waterline cleaning without a cord, with app-selected modes.
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 Tracker 55: our take
Dolphin Liberty 400 and Niya Tracker 55 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 Tracker 55 is rated up to 40 ft. Each cleans floor, walls, and waterline, so coverage alone does not separate them. Niya Tracker 55's documented cleaning system includes 2 active brushes, Sonar navigation, and Dual drive motors.
Filtration and debris
Dolphin Liberty 400 includes Basket and UltraFilter; Niya Tracker 55 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 Tracker 55 provides one-touch starts and smartphone control. Both use cordless battery power. Dolphin Liberty 400 is listed at 17.9 lb versus 19.8 lb for Niya Tracker 55; that 1.9000000000000021 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 Tracker 55 at $779; Niya Tracker 55 is $650 less. Dolphin Liberty 400 lists a 3-year warranty compared with 1.5 years for Niya Tracker 55. Dolphin Liberty 400 and Niya Tracker 55 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 Tracker 55 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | Yes | Yes |
| Scrubs the waterline | Yes | Yes |
| Fine-debris filter included | YesEdge | No |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | YesEdge | No |
| Smartphone app | Yes | Yes |
| 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 inground and above-ground pools up to 33 ft that need floor, wall and waterline cleaning without a cord.
- Includes filtration for sand, pollen and other fine debris
- Can start on a weekly schedule without a manual launch before every cycle
- Carries a 3-year warranty instead of 1.5 years
- Weighs 17.9 lb versus 19.8 lb
Where Niya Tracker 55 stands out
Niya Tracker 55 is the better fit for shoppers prioritizing the lower $779 starting price.
- Is rated for pools up to 40 ft
- Is listed $650 lower
Dolphin Liberty 400 vs Niya Tracker 55 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 Tracker 55 |
|---|---|---|
| Best fit | Inground and above-ground pools up to 33 ft that need floor, wall and waterline cleaning without a cord. | Inground and above-ground pools up to 40 ft that need floor, wall and waterline cleaning without a cord, with app-selected modes. |
| Starting price | $1,429 | $779 |
| Pool type | Inground, Above-ground | Inground, Above-ground |
| Maximum pool length | Up to 33 ft | Up to 40 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor, Walls, Waterline |
| Power | Cordless | Cordless |
| Filtration | Basket, UltraFilter | Basket |
| Scheduling | Weekly schedule + app | One-touch start |
| App and remote | App control | App control |
| Cable | Cordless | Cordless |
| Robot weight | 17.9 lb | 19.8 lb |
| Warranty | 3 years | 1.5 years |
Consider the stronger Pool Express option
Dolphin Liberty 400 and Niya Tracker 55 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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