Help me choose
A stronger Pool Express option
Dolphin M550 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.
M-Line
Dolphin M550
Inground pools up to 50 ft that need floor, wall and waterline cleaning with app control, Pick-Up and a caddy.
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 M550 or Niya Tracker 25: our take
Dolphin M550 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 M550 is intended for inground pools, while Niya Tracker 25 is intended for above-ground pools. Dolphin M550 is rated for pools up to 50 ft; Niya Tracker 25 is rated up to 26 ft. Dolphin M550 cleans floor, walls, and waterline; Niya Tracker 25 cleans floor. Dolphin M550 lists 2 active brushes and CleverClean navigation. Niya Tracker 25 lists Sonar navigation and Brushless motors.
Filtration and debris
Dolphin M550 includes Basket and UltraFilter; Niya Tracker 25 includes Basket. That gives Dolphin M550 the clearer documented edge for fine silt, pollen and sand.
Controls and day-to-day ownership
Dolphin M550 provides a weekly timer and smartphone control; Niya Tracker 25 provides one-touch starts and power-supply controls. Dolphin M550 uses continuous corded power, while Niya Tracker 25 uses cordless battery power. Dolphin M550 is listed at 22.6 lb versus 10 lb for Niya Tracker 25; that 12.600000000000001 lb difference matters when lifting the robot from the pool.
Price, warranty and the decision
Dolphin M550 is listed at $1,999 and Niya Tracker 25 at $379; Niya Tracker 25 is $1,620 less. Dolphin M550 lists a 3-year warranty compared with 1.5 years for Niya Tracker 25. Dolphin M550 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 M550 | 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 | YesEdge | 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 M550 stands out
Dolphin M550 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 $1,620 lower
- Weighs 10 lb versus 22.6 lb
Dolphin M550 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 M550 | Niya Tracker 25 |
|---|---|---|
| Best fit | Inground pools up to 50 ft that need floor, wall and waterline cleaning with app control, Pick-Up and a caddy. | Above-ground pools up to 26 ft that need the floor cleaned without a cord. |
| Starting price | $1,999 | $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 control | Power-supply controls |
| Cable | Not listed | Cordless |
| Robot weight | 22.6 lb | 10 lb |
| Warranty | 3 years | 1.5 years |
Consider the stronger Pool Express option
Dolphin M550 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.
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