Robotic pool cleaner comparison

Aquabot X2 vs Dolphin S300

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

Aquabot X2 and Dolphin S300 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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Aquabot

Aquabot X2

Inground and above-ground pools up to 40 ft that need floor cleaning.

Listed price $497

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S-Line

Dolphin S300

Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.

Listed price $1,499

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A better alternative

What we recommend instead

Pool Express pick

Dolphin Quantum

Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.

$1,649

Buy Dolphin Quantum

Buying guidance

Aquabot X2 or Dolphin S300: our take

Aquabot X2 and Dolphin S300 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

Aquabot X2 is intended for inground and above-ground pools, while Dolphin S300 is intended for inground pools. Aquabot X2 is rated for pools up to 40 ft; Dolphin S300 is rated up to 50 ft. Aquabot X2 cleans floor; Dolphin S300 cleans floor, walls, and waterline. Aquabot X2 lists 1 active brush. Dolphin S300 lists 2 active brushes and CleverClean navigation.

Filtration and debris

Dolphin S300 has documented included filtration—Basket and UltraFilter—while the other model's included media is not fully published. Dolphin S300 has the clearer documented edge for fine silt, pollen and sand. Dolphin S300 has the better documented path for bulky leaves and larger debris.

Controls and day-to-day ownership

Aquabot X2 provides no fully published timer, app or remote specification; Dolphin S300 provides a weekly timer and smartphone control.

Price, warranty and the decision

Aquabot X2 is listed at $497 and Dolphin S300 at $1,499; Aquabot X2 is $1,002 less. Each lists a 2-year manufacturer warranty. Aquabot X2 and Dolphin S300 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	Aquabot X2	Dolphin S300
Cleans the pool floor	Yes	Yes
Climbs and cleans walls	No	YesEdge
Scrubs the waterline	No	YesEdge
Fine-debris filter included	No	YesEdge
Large-debris filter	No	YesEdge
Automatic scheduling	Not listed	Yes
Smartphone app	Not listed	Yes
Anti-tangle swivel	Not listed	Yes
3-year warranty	No	No
No recharging between cycles	Not listed	Yes
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 Aquabot X2 stands out

Aquabot X2 is the better fit for shoppers prioritizing the lower $497 starting price.

Is listed $1,002 lower
Cleans the pool floor

Where Dolphin S300 stands out

Dolphin S300 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
Includes a large-debris bin or bag for leaves
Uses 2 active brushes instead of 1