Robotic pool cleaner comparison

Dolphin Liberty 300 vs Dolphin Proteus DX3

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 Liberty 300 and Dolphin Proteus DX3 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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Liberty

Dolphin Liberty 300

Inground and above-ground pools that need floor and wall cleaning, with fine debris, without a power cord.

Listed price $1,099

View better alternatives

Proteus

Dolphin Proteus DX3

Inground and above-ground pools up to 33 ft that need floor and wall cleaning.

Listed price $699

View better alternatives

A better alternative

What we recommend instead

Pool Express pick

Dolphin Cayman

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

$1,079

Buy Dolphin Cayman

Buying guidance

Dolphin Liberty 300 or Dolphin Proteus DX3: our take

Dolphin Liberty 300 and Dolphin Proteus DX3 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 inground and above-ground pools. Dolphin Proteus DX3 has a published maximum pool length of 33 ft; the other model does not have a verified length in our source material. Each cleans floor and walls, so coverage alone does not separate them. Dolphin Liberty 300 lists Dual DC motors. Dolphin Proteus DX3 lists 1 active brush.

Filtration and debris

Dolphin Liberty 300 includes Basket and UltraFilter; Dolphin Proteus DX3 includes Basket. That gives Dolphin Liberty 300 the clearer documented edge for fine silt, pollen and sand.

Controls and day-to-day ownership

Dolphin Liberty 300 provides no fully published timer, app or remote specification; Dolphin Proteus DX3 provides a weekly timer and power-supply controls. Dolphin Liberty 300 uses cordless battery power, while Dolphin Proteus DX3 uses a 50 ft corded cable.

Price, warranty and the decision

Dolphin Liberty 300 is listed at $1,099 and Dolphin Proteus DX3 at $699; Dolphin Proteus DX3 is $400 less. Each lists a 2-year manufacturer warranty. Dolphin Liberty 300 and Dolphin Proteus DX3 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 Liberty 300	Dolphin Proteus DX3
Cleans the pool floor	Yes	Yes
Climbs and cleans walls	Yes	Yes
Scrubs the waterline	No	No
Fine-debris filter included	YesEdge	No
Large-debris filter	Yes	Yes
Automatic scheduling	Not listed	Yes
Smartphone app	Not listed	No
Anti-tangle swivel	Not listed	Not listed
3-year warranty	No	No
No recharging between cycles	No	YesEdge
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 Liberty 300 stands out

Dolphin Liberty 300 is the better fit for owners who value cordless handling more than automatic scheduling and continuous power.

Includes filtration for sand, pollen and other fine debris
Cordless, battery powered

Where Dolphin Proteus DX3 stands out

Dolphin Proteus DX3 is the better fit for shoppers prioritizing the lower $699 starting price.

Runs from continuous plug-in power without a recharge between cycles
Is listed $400 lower

Dolphin Liberty 300 vs Dolphin Proteus DX3 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 Liberty 300	Dolphin Proteus DX3
Best fit	Inground and above-ground pools that need floor and wall cleaning, with fine debris, without a power cord.	Inground and above-ground pools up to 33 ft that need floor and wall cleaning.
Starting price	$1,099	$699
Pool type	Inground, Above-ground	Inground, Above-ground
Maximum pool length	Not listed	Up to 33 ft
Cleaning coverage	Floor, Walls	Floor, Walls
Power	Cordless	Corded
Filtration	Basket, UltraFilter	Basket
Scheduling	Not listed	Weekly schedule
App and remote	Not listed	Power-supply controls
Cable	Cordless	50 ft
Robot weight	Not listed	14 lb
Warranty	2 years	2 years

Final call

Consider the stronger Pool Express option