Help me choose
A stronger Pool Express option
Dolphin Nautilus CC 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.
Nautilus
Dolphin Nautilus CC
Inground and above-ground pools up to 33 ft that need floor and wall cleaning.
Oasis
Dolphin Oasis Z5i
Inground pools up to 50 ft that need floor, wall and waterline cleaning with app scheduling.
What we recommend instead
Dolphin Quantum
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
$1,649
Buy Dolphin QuantumDolphin Nautilus CC or Dolphin Oasis Z5i: our take
Dolphin Nautilus CC 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
Dolphin Nautilus CC is intended for inground and above-ground pools, while Dolphin Oasis Z5i is intended for inground pools. Dolphin Nautilus CC is rated for pools up to 33 ft; Dolphin Oasis Z5i is rated up to 50 ft. Dolphin Nautilus CC cleans floor and walls; Dolphin Oasis Z5i cleans floor, walls, and waterline. Dolphin Nautilus CC lists 1 active brush. Dolphin Oasis Z5i lists CleverClean navigation.
Filtration and debris
Dolphin Nautilus CC 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
Dolphin Nautilus CC provides one-touch starts and power-supply controls; Dolphin Oasis Z5i provides a weekly timer and smartphone control. Dolphin Nautilus CC uses a 50 ft corded cable, while Dolphin Oasis Z5i uses continuous corded power.
Price, warranty and the decision
Dolphin Nautilus CC lists a 2-year warranty compared with 3 years for Dolphin Oasis Z5i. Dolphin Nautilus CC 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 | Dolphin Nautilus CC | Dolphin Oasis Z5i |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | Yes | Yes |
| Scrubs the waterline | No | YesEdge |
| Fine-debris filter included | No | YesEdge |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | No | YesEdge |
| Smartphone app | No | YesEdge |
| Anti-tangle swivel | No | YesEdge |
| 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 Dolphin Nautilus CC stands out
Dolphin Nautilus CC is the better fit for inground and above-ground pools up to 33 ft that need floor and wall cleaning.
- Cleans floor and walls
- 50 ft cable, no swivel
Where Dolphin Oasis Z5i stands out
Dolphin Oasis Z5i 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
- Can start on a weekly schedule without a manual launch before every cycle
- Adds smartphone control
Dolphin Nautilus CC vs Dolphin Oasis Z5i 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 Nautilus CC | Dolphin Oasis Z5i |
|---|---|---|
| Best fit | Inground and above-ground pools up to 33 ft that need floor and wall cleaning. | Inground pools up to 50 ft that need floor, wall and waterline cleaning with app scheduling. |
| Starting price | $699 | See product |
| Pool type | Inground, Above-ground | Inground |
| Maximum pool length | Up to 33 ft | Up to 50 ft |
| Cleaning coverage | Floor, Walls | Floor, Walls, Waterline |
| Power | Corded | Corded |
| Filtration | Basket | Basket, UltraFilter |
| Scheduling | One-touch start | Weekly schedule + app |
| App and remote | Power-supply controls | App control |
| Cable | 50 ft | Not listed |
| Robot weight | Not listed | 26.7 lb |
| Warranty | 2 years | 3 years |
Consider the stronger Pool Express option
Dolphin Nautilus CC 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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