Help me choose
A stronger Pool Express option
Dolphin Explorer E25 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.
Explorer
Dolphin Explorer E25
Inground pools up to 50 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 Quantum
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
$1,649
Buy Dolphin QuantumDolphin Explorer E25 or Niya Tracker 55: our take
Dolphin Explorer E25 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 Explorer E25 is intended for inground pools, while Niya Tracker 55 is intended for inground and above-ground pools. Dolphin Explorer E25 is rated for pools up to 50 ft; Niya Tracker 55 is rated up to 40 ft. Dolphin Explorer E25 cleans floor and walls; Niya Tracker 55 cleans floor, walls, and waterline. Niya Tracker 55's documented cleaning system includes 2 active brushes, Sonar navigation, and Dual drive motors.
Filtration and debris
Niya Tracker 55 has documented included filtration—Basket—while the other model's included media is not fully published. Niya Tracker 55 has the better documented path for bulky leaves and larger debris.
Controls and day-to-day ownership
Dolphin Explorer E25 provides smartphone control; Niya Tracker 55 provides one-touch starts and smartphone control.
Price, warranty and the decision
Dolphin Explorer E25 is listed at $899 and Niya Tracker 55 at $779; Niya Tracker 55 is $120 less. Dolphin Explorer E25 lists a 2-year warranty compared with 1.5 years for Niya Tracker 55. Dolphin Explorer E25 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 Explorer E25 | Niya Tracker 55 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | Yes | Yes |
| Scrubs the waterline | No | YesEdge |
| Fine-debris filter included | No | No |
| Large-debris filter | No | YesEdge |
| Automatic scheduling | Not listed | No |
| Smartphone app | Yes | Yes |
| Anti-tangle swivel | Not listed | Not listed |
| 3-year warranty | No | No |
| No recharging between cycles | Not listed | 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 Explorer E25 stands out
Dolphin Explorer E25 is the better fit for pools up to 50 ft.
- Carries a 2-year warranty instead of 1.5 years
- Is rated for pools up to 50 ft
Where Niya Tracker 55 stands out
Niya Tracker 55 is the better fit for shoppers prioritizing the lower $779 starting price.
- Cleans the floor, walls and waterline instead of stopping below the tile line
- Includes a large-debris bin or bag for leaves
- Is listed $120 lower
Dolphin Explorer E25 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 Explorer E25 | Niya Tracker 55 |
|---|---|---|
| Best fit | Inground pools up to 50 ft that need floor and wall 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 | $899 | $779 |
| Pool type | Inground | Inground, Above-ground |
| Maximum pool length | Up to 50 ft | Up to 40 ft |
| Cleaning coverage | Floor, Walls | Floor, Walls, Waterline |
| Power | Not listed | Cordless |
| Filtration | Not listed | Basket |
| Scheduling | Not listed | One-touch start |
| App and remote | App control | App control |
| Cable | Not listed | Cordless |
| Robot weight | Not listed | 19.8 lb |
| Warranty | 2 years | 1.5 years |
Consider the stronger Pool Express option
Dolphin Explorer E25 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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