Help me choose
A stronger Pool Express option
Dolphin S50 and Niya Tracker 55 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.
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 Cayman
Inground and above-ground pools up to 40 ft that need floor and wall cleaning.
$1,079
Buy Dolphin CaymanDolphin S50 or Niya Tracker 55: our take
Dolphin S50 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
Dolphin S50 is intended for above-ground pools, while Niya Tracker 55 is intended for inground and above-ground pools. Dolphin S50 is rated for pools up to 30 ft; Niya Tracker 55 is rated up to 40 ft. Dolphin S50 cleans floor; Niya Tracker 55 cleans floor, walls, and waterline. Dolphin S50 lists 1 active brush. Niya Tracker 55 lists 2 active brushes, Sonar navigation, and Dual drive motors.
Filtration and debris
Both models include Basket.
Controls and day-to-day ownership
Dolphin S50 provides one-touch starts and power-supply controls; Niya Tracker 55 provides one-touch starts and smartphone control. Dolphin S50 uses a 40 ft corded cable, while Niya Tracker 55 uses cordless battery power. Dolphin S50 is listed at 14 lb versus 19.8 lb for Niya Tracker 55; that 5.800000000000001 lb difference matters when lifting the robot from the pool.
Price, warranty and the decision
Dolphin S50 is listed at $649 and Niya Tracker 55 at $779; Dolphin S50 is $130 less. Dolphin S50 lists a 2-year warranty compared with 1.5 years for Niya Tracker 55. Dolphin S50 and Niya Tracker 55 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 S50 | Niya Tracker 55 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | No | YesEdge |
| Scrubs the waterline | No | YesEdge |
| Fine-debris filter included | No | No |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | No | No |
| Smartphone app | No | YesEdge |
| 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 Dolphin S50 stands out
Dolphin S50 is the better fit for shoppers prioritizing the lower $649 starting price.
- Carries a 2-year warranty instead of 1.5 years
- Runs from continuous plug-in power without a recharge between cycles
- Is listed $130 lower
- Weighs 14 lb versus 19.8 lb
Where Niya Tracker 55 stands out
Niya Tracker 55 is the better fit for owners who value cordless handling more than automatic scheduling and continuous power.
- Cleans the floor, walls and waterline instead of stopping below the tile line
- Uses 2 active brushes instead of 1
- Adds smartphone control
- Is rated for pools up to 40 ft
Dolphin S50 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 S50 | Niya Tracker 55 |
|---|---|---|
| Best fit | Above-ground pools up to 30 ft that need floor cleaning. | 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 | $649 | $779 |
| Pool type | Above-ground | Inground, Above-ground |
| Maximum pool length | Up to 30 ft | Up to 40 ft |
| Cleaning coverage | Floor | Floor, Walls, Waterline |
| Power | Corded | Cordless |
| Filtration | Basket | Basket |
| Scheduling | One-touch start | One-touch start |
| App and remote | Power-supply controls | App control |
| Cable | 40 ft | Cordless |
| Robot weight | 14 lb | 19.8 lb |
| Warranty | 2 years | 1.5 years |
Consider the stronger Pool Express option
Dolphin S50 and Niya Tracker 55 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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