Dolphin Nautilus AG vs NIYA Sonar 20

Both clean the same surfaces. At about $568 and $199, the table below is where the difference in price has to be found.

Dolphin

Dolphin Nautilus AG

~$568

A floor-only corded Dolphin built for above-ground pools up to 30 feet.

Best for: An above-ground pool with a flat floor and no interest in apps

NIYA

~$199

Pool fit: ~48 ft (floor only)90 min floor-only runtime at 13 sq ft/min — walls not counted
Filtration: No micron figure published
Retrieval: You fish out 10 lb

NIYA is Maytronics' budget brand, and the Sonar 20 is its $199 floor robot for above-ground pools up to 26 feet.

Best for: A small above-ground pool on a sub-$200 budget

Specification comparison of the Dolphin Nautilus AG and the NIYA Sonar 20
Specification	Dolphin Nautilus AG	NIYA Sonar 20
Approx. price	~$568	~$199
Type	Above-ground	Above-ground
Power	Corded	Cordless
Cleans	Floor	Floor
Pool fit	not published	~48 ft, floor only
Maker's pool claim	30 ft	26 ft
Default cycle	90 min	not published
Runtime, floor only	not published	90 min
Filter	Fine filter kit, top access	Coarse filter, top access
Weight	14.6 lb	10 lb
Retrieval	You fish out 14.6 lb	You fish out 10 lb
Navigation	not published	Ultrasonic
App control	No	No
Pool types	above-ground	above-ground
Surfaces	not published	vinyl, concrete, fiberglass, tile
Warranty	1 year	1 year
Cost per swim season	$568 floor	$199 floor

Floor only — it will not climb the wall
No timer, so someone starts every run
One-year warranty; Maytronics' two-year terms start with the $899 Active 15
No cable length published, so whether it reaches across a 30 ft round pool from where the outlet is cannot be checked