Help me choose
A stronger Pool Express option
Dolphin M550 and Niya Tracker 35 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.
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 35
Inground and above-ground pools up to 40 ft that need floor, wall and waterline cleaning without a cord.
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 M550 or Niya Tracker 35: our take
Dolphin M550 and Niya Tracker 35 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 35 is intended for inground and above-ground pools. Dolphin M550 is rated for pools up to 50 ft; Niya Tracker 35 is rated up to 40 ft. Each cleans floor, walls, and waterline, so coverage alone does not separate them. Dolphin M550 lists 2 active brushes and CleverClean navigation. Niya Tracker 35 lists 2 active brushes, Sonar navigation, and Dual drive motors.
Filtration and debris
Dolphin M550 includes Basket and UltraFilter; Niya Tracker 35 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 35 provides one-touch starts. Dolphin M550 uses continuous corded power, while Niya Tracker 35 uses cordless battery power. Dolphin M550 is listed at 22.6 lb versus 19.2 lb for Niya Tracker 35; that 3.400000000000002 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 35 at $539; Niya Tracker 35 is $1,460 less. Dolphin M550 lists a 3-year warranty compared with 1.5 years for Niya Tracker 35. Dolphin M550 and Niya Tracker 35 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 M550 | Niya Tracker 35 |
|---|---|---|
| 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 | Not listed |
| 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.
- Includes filtration for sand, pollen and other fine debris
- Can start on a weekly schedule without a manual launch before every cycle
- Has documented smartphone control
- Carries a 3-year warranty instead of 1.5 years
Where Niya Tracker 35 stands out
Niya Tracker 35 is the better fit for shoppers prioritizing the lower $539 starting price.
- Is listed $1,460 lower
- Weighs 19.2 lb versus 22.6 lb
Dolphin M550 vs Niya Tracker 35 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 35 |
|---|---|---|
| Best fit | Inground pools up to 50 ft that need floor, wall and waterline cleaning with app control, Pick-Up and a caddy. | Inground and above-ground pools up to 40 ft that need floor, wall and waterline cleaning without a cord. |
| Starting price | $1,999 | $539 |
| Pool type | Inground | Inground, Above-ground |
| Maximum pool length | Up to 50 ft | Up to 40 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor, Walls, Waterline |
| Power | Corded | Cordless |
| Filtration | Basket, UltraFilter | Basket |
| Scheduling | Weekly schedule + app | One-touch start |
| App and remote | App control | Not listed |
| Cable | Not listed | Cordless |
| Robot weight | 22.6 lb | 19.2 lb |
| Warranty | 3 years | 1.5 years |
Consider the stronger Pool Express option
Dolphin M550 and Niya Tracker 35 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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