Help me choose
A stronger Pool Express option
Dolphin T55i and Niya Tracker 25 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.
T-Line
Dolphin T55i
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
Niya Tracker
Niya Tracker 25
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 T55i or Niya Tracker 25: our take
Dolphin T55i and Niya Tracker 25 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 T55i is intended for inground pools, while Niya Tracker 25 is intended for above-ground pools. Dolphin T55i is rated for pools up to 50 ft; Niya Tracker 25 is rated up to 26 ft. Dolphin T55i cleans floor, walls, and waterline; Niya Tracker 25 cleans floor. Niya Tracker 25's documented cleaning system includes Sonar navigation and Brushless motors.
Filtration and debris
Dolphin T55i includes Basket and UltraFilter; Niya Tracker 25 includes Basket. That gives Dolphin T55i the clearer documented edge for fine silt, pollen and sand.
Controls and day-to-day ownership
Dolphin T55i provides a weekly timer, smartphone control, and included remote control; Niya Tracker 25 provides one-touch starts and power-supply controls. Dolphin T55i uses a 60 ft corded cable with an anti-tangle swivel, while Niya Tracker 25 uses cordless battery power.
Price, warranty and the decision
Dolphin T55i is listed at $1,699 and Niya Tracker 25 at $379; Niya Tracker 25 is $1,320 less. Dolphin T55i lists a 2-year warranty compared with 1.5 years for Niya Tracker 25. Dolphin T55i and Niya Tracker 25 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 T55i | Niya Tracker 25 |
|---|---|---|
| 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 | Yes | 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 T55i stands out
Dolphin T55i is the better fit for pools up to 50 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 Tracker 25 stands out
Niya Tracker 25 is the better fit for shoppers prioritizing the lower $379 starting price.
- Is listed $1,320 lower
- Cleans the pool floor
Dolphin T55i vs Niya Tracker 25 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 T55i | Niya Tracker 25 |
|---|---|---|
| Best fit | Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris. | Above-ground pools up to 26 ft that need the floor cleaned without a cord. |
| Starting price | $1,699 | $379 |
| Pool type | Inground | Above-ground |
| Maximum pool length | Up to 50 ft | Up to 26 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor |
| Power | Corded | Cordless |
| Filtration | Basket, UltraFilter | Basket |
| Scheduling | Weekly schedule + app | One-touch start |
| App and remote | App + included remote | Power-supply controls |
| Cable | 60 ft with anti-tangle swivel | Cordless |
| Robot weight | Not listed | 10 lb |
| Warranty | 2 years | 1.5 years |
Consider the stronger Pool Express option
Dolphin T55i and Niya Tracker 25 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.
More robotic pool cleaner comparisons
Keep comparing without rebuilding the same specification table yourself.
Clear UV vs Clear S
Pool Express pick: Clear UV
Dolphin Quantum vs Clear S
Pool Express pick: Dolphin Quantum
Dolphin Premier vs Dolphin Sigma
Pool Express pick: Dolphin Premier
Dolphin Premier vs Dolphin Quantum
Pool Express pick: Dolphin Quantum
Dolphin Sigma vs Dolphin Quantum
Pool Express pick: Dolphin Quantum
Dolphin Cayman vs Dolphin Escape
Pool Express pick: Dolphin Cayman