Robotic pool cleaner comparison

Dolphin S50 vs Niya Tracker 25

A side-by-side comparison of pool fit, cleaning coverage, filtration, controls and the better Pool Express option.

By Brian Williamson, Pool Express product specialist
Updated November 9, 2026

Better alternative

A stronger Pool Express option

Dolphin S50 and Niya Tracker 25 are compared feature by feature below. For a stronger Pool Express option, consider Dolphin Escape. Inground and above-ground pools up to 30 ft that need floor cleaning.

Buy Dolphin Escape Compare every robot

S-Line

Dolphin S50

Above-ground pools up to 30 ft that need floor cleaning.

Listed price $649

View better alternatives

Niya Tracker

Niya Tracker 25

Above-ground pools up to 26 ft that need the floor cleaned without a cord.

Listed price $379

View better alternatives

A better alternative

What we recommend instead

Pool Express pick

Dolphin Escape

Inground and above-ground pools up to 30 ft that need floor cleaning.

$669

Buy Dolphin Escape

Buying guidance

Dolphin S50 or Niya Tracker 25: our take

Dolphin S50 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

Both robots are intended for above-ground pools. Dolphin S50 is rated for pools up to 30 ft; Niya Tracker 25 is rated up to 26 ft. Each cleans floor, so coverage alone does not separate them. Dolphin S50 lists 1 active brush. Niya Tracker 25 lists Sonar navigation and Brushless motors.

Filtration and debris

Both models include Basket.

Controls and day-to-day ownership

Both models provide one-touch starts and power-supply controls. Dolphin S50 uses a 40 ft corded cable, while Niya Tracker 25 uses cordless battery power. Dolphin S50 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 S50 is listed at $649 and Niya Tracker 25 at $379; Niya Tracker 25 is $270 less. Dolphin S50 lists a 2-year warranty compared with 1.5 years for Niya Tracker 25. Dolphin S50 and Niya Tracker 25 each have a specific fit, but neither is the Pool Express pick for this job. Our better alternative is Dolphin Escape. Inground and above-ground pools up to 30 ft that need floor 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 S50	Niya Tracker 25
Cleans the pool floor	Yes	Yes
Climbs and cleans walls	No	No
Scrubs the waterline	No	No
Fine-debris filter included	No	No
Large-debris filter	Yes	Yes
Automatic scheduling	No	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 S50 stands out

Dolphin S50 is the better fit for pools up to 30 ft.

Carries a 2-year warranty instead of 1.5 years
Is rated for pools up to 30 ft
Runs from continuous plug-in power without a recharge between cycles

Where Niya Tracker 25 stands out

Niya Tracker 25 is the better fit for shoppers prioritizing the lower $379 starting price.

Is listed $270 lower
Weighs 10 lb versus 14 lb