Robotic pool cleaner comparison

Aquabot X4 vs Dolphin Oasis Z5i

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 X4 and Dolphin Oasis Z5i 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 X4

Inground and above-ground pools up to 60 ft that need floor, wall and waterline cleaning.

Listed price $747

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Oasis

Dolphin Oasis Z5i

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

Listed price See product

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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

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Buying guidance

Aquabot X4 or Dolphin Oasis Z5i: our take

Aquabot X4 and Dolphin Oasis Z5i 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 X4 is intended for inground and above-ground pools, while Dolphin Oasis Z5i is intended for inground pools. Aquabot X4 is rated for pools up to 60 ft; Dolphin Oasis Z5i is rated up to 50 ft. Each cleans floor, walls, and waterline, so coverage alone does not separate them. Aquabot X4 lists 1 active brush and Intelligent navigation. Dolphin Oasis Z5i lists CleverClean navigation.

Filtration and debris

Aquabot X4 includes Basket; Dolphin Oasis Z5i includes Basket and UltraFilter. Dolphin Oasis Z5i has the clearer documented edge for fine silt, pollen and sand.

Controls and day-to-day ownership

Aquabot X4 provides a weekly timer; Dolphin Oasis Z5i provides a weekly timer and smartphone control. Aquabot X4 uses a 60 ft corded cable with an anti-tangle swivel, while Dolphin Oasis Z5i uses continuous corded power. Aquabot X4 is listed at 40 lb versus 26.7 lb for Dolphin Oasis Z5i; that 13.3 lb difference matters when lifting the robot from the pool.

Price, warranty and the decision

Aquabot X4 lists a 2-year warranty compared with 3 years for Dolphin Oasis Z5i. Aquabot X4 and Dolphin Oasis Z5i 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 X4	Dolphin Oasis Z5i
Cleans the pool floor	Yes	Yes
Climbs and cleans walls	Yes	Yes
Scrubs the waterline	Yes	Yes
Fine-debris filter included	No	YesEdge
Large-debris filter	Yes	Yes
Automatic scheduling	Yes	Yes
Smartphone app	Not listed	Yes
Anti-tangle swivel	Yes	Yes
3-year warranty	No	YesEdge
No recharging between cycles	Yes	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 X4 stands out

Aquabot X4 is the better fit for pools up to 60 ft.

Is rated for pools up to 60 ft
60 ft cable with anti-tangle swivel

Where Dolphin Oasis Z5i stands out

Dolphin Oasis Z5i is the better fit for inground pools up to 50 ft that need floor, wall and waterline cleaning with app scheduling.

Includes filtration for sand, pollen and other fine debris
Has documented smartphone control
Carries a 3-year warranty instead of 2 years
Weighs 26.7 lb versus 40 lb