Help me choose
A stronger Pool Express option
Dolphin S100 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.
S-Line
Dolphin S100
Inground and above-ground pools up to 33 ft that need floor and wall 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 S100 or Niya Tracker 25: our take
Dolphin S100 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 S100 is intended for inground and above-ground pools, while Niya Tracker 25 is intended for above-ground pools. Dolphin S100 is rated for pools up to 33 ft; Niya Tracker 25 is rated up to 26 ft. Dolphin S100 cleans floor and walls; Niya Tracker 25 cleans floor. Dolphin S100 lists 1 active brush. Niya Tracker 25 lists Sonar navigation and Brushless motors.
Filtration and debris
Dolphin S100 includes Basket and UltraFilter; Niya Tracker 25 includes Basket. That gives Dolphin S100 the clearer documented edge for fine silt, pollen and sand.
Controls and day-to-day ownership
Dolphin S100 provides a weekly timer and power-supply controls; Niya Tracker 25 provides one-touch starts and power-supply controls. Dolphin S100 uses a 50 ft corded cable, while Niya Tracker 25 uses cordless battery power. Dolphin S100 is listed at 14 lb versus 10 lb for Niya Tracker 25; that 4 lb difference matters when lifting the robot from the pool.
Price, warranty and the decision
Dolphin S100 is listed at $849 and Niya Tracker 25 at $379; Niya Tracker 25 is $470 less. Dolphin S100 lists a 2-year warranty compared with 1.5 years for Niya Tracker 25. Dolphin S100 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 S100 | Niya Tracker 25 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | YesEdge | No |
| Scrubs the waterline | No | No |
| Fine-debris filter included | YesEdge | No |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | YesEdge | No |
| Smartphone app | No | No |
| 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 S100 stands out
Dolphin S100 is the better fit for pools up to 33 ft.
- Adds wall climbing and scrubbing
- Includes filtration for sand, pollen and other fine debris
- Can start on a weekly schedule without a manual launch before every cycle
- Carries a 2-year warranty instead of 1.5 years
Where Niya Tracker 25 stands out
Niya Tracker 25 is the better fit for shoppers prioritizing the lower $379 starting price.
- Is listed $470 lower
- Weighs 10 lb versus 14 lb
Dolphin S100 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 S100 | Niya Tracker 25 |
|---|---|---|
| Best fit | Inground and above-ground pools up to 33 ft that need floor and wall cleaning, with fine debris. | Above-ground pools up to 26 ft that need the floor cleaned without a cord. |
| Starting price | $849 | $379 |
| Pool type | Inground, Above-ground | Above-ground |
| Maximum pool length | Up to 33 ft | Up to 26 ft |
| Cleaning coverage | Floor, Walls | Floor |
| Power | Corded | Cordless |
| Filtration | Basket, UltraFilter | Basket |
| Scheduling | Weekly schedule | One-touch start |
| App and remote | Power-supply controls | Power-supply controls |
| Cable | 50 ft | Cordless |
| Robot weight | 14 lb | 10 lb |
| Warranty | 2 years | 1.5 years |
Consider the stronger Pool Express option
Dolphin S100 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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