Help me choose
A stronger Pool Express option
Dolphin Nautilus Pool Up and Dolphin S50 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.
Nautilus
Dolphin Nautilus Pool Up
Inground and above-ground pools up to 30 ft that need floor and wall cleaning, with heavy leaves.
What we recommend instead
Dolphin Cayman
Inground and above-ground pools up to 40 ft that need floor and wall cleaning.
$1,079
Buy Dolphin CaymanDolphin Nautilus Pool Up or Dolphin S50: our take
Dolphin Nautilus Pool Up and Dolphin S50 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 Pool Up is intended for inground and above-ground pools, while Dolphin S50 is intended for above-ground pools. Both are rated for pools up to 30 ft. Dolphin Nautilus Pool Up cleans floor and walls; Dolphin S50 cleans floor. Dolphin Nautilus Pool Up's documented cleaning system includes 1 active brush.
Filtration and debris
Dolphin Nautilus Pool Up includes Oversized leaf bag; Dolphin S50 includes Basket.
Controls and day-to-day ownership
Both models provide one-touch starts and power-supply controls. Both use a 40 ft corded cable. Dolphin Nautilus Pool Up is listed at 18 lb versus 14 lb for Dolphin S50; that 4 lb difference matters when lifting the robot from the pool.
Price, warranty and the decision
Dolphin Nautilus Pool Up is listed at $499 and Dolphin S50 at $649; Dolphin Nautilus Pool Up is $150 less. Each lists a 2-year manufacturer warranty. Dolphin Nautilus Pool Up and Dolphin S50 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 Nautilus Pool Up | Dolphin S50 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | YesEdge | No |
| Scrubs the waterline | No | No |
| Fine-debris filter included | No | No |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | No | No |
| Smartphone app | No | No |
| Anti-tangle swivel | Not listed | Not listed |
| 3-year warranty | No | No |
| 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 Pool Up stands out
Dolphin Nautilus Pool Up is the better fit for shoppers prioritizing the lower $499 starting price.
- Adds wall climbing and scrubbing
- Includes an oversized leaf bag for bulky seasonal debris
- Is listed $150 lower
Where Dolphin S50 stands out
Dolphin S50 is the better fit for above-ground pools up to 30 ft that need floor cleaning.
- Weighs 14 lb versus 18 lb
- Cleans the pool floor
Dolphin Nautilus Pool Up vs Dolphin S50 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 Pool Up | Dolphin S50 |
|---|---|---|
| Best fit | Inground and above-ground pools up to 30 ft that need floor and wall cleaning, with heavy leaves. | Above-ground pools up to 30 ft that need floor cleaning. |
| Starting price | $499 | $649 |
| Pool type | Inground, Above-ground | Above-ground |
| Maximum pool length | Up to 30 ft | Up to 30 ft |
| Cleaning coverage | Floor, Walls | Floor |
| Power | Corded | Corded |
| Filtration | Oversized leaf bag | Basket |
| Scheduling | One-touch start | One-touch start |
| App and remote | Power-supply controls | Power-supply controls |
| Cable | 40 ft | 40 ft |
| Robot weight | 18 lb | 14 lb |
| Warranty | 2 years | 2 years |
Consider the stronger Pool Express option
Dolphin Nautilus Pool Up and Dolphin S50 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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