Help me choose
A stronger Pool Express option
Dolphin Nautilus Titan 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 Titan
Inground pools up to 50 ft that need floor, wall and waterline cleaning with app control.
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 Titan or Dolphin S50: our take
Dolphin Nautilus Titan 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 Titan is intended for inground pools, while Dolphin S50 is intended for above-ground pools. Dolphin Nautilus Titan is rated for pools up to 50 ft; Dolphin S50 is rated up to 30 ft. Dolphin Nautilus Titan cleans floor, walls, and waterline; Dolphin S50 cleans floor. Dolphin Nautilus Titan lists 2 active brushes and CleverClean navigation. Dolphin S50 lists 1 active brush.
Filtration and debris
Dolphin Nautilus Titan includes Basket and UltraFilter; Dolphin S50 includes Basket. That gives Dolphin Nautilus Titan the clearer documented edge for fine silt, pollen and sand.
Controls and day-to-day ownership
Dolphin Nautilus Titan provides a weekly timer and smartphone control; Dolphin S50 provides one-touch starts and power-supply controls. Dolphin Nautilus Titan uses continuous corded power, while Dolphin S50 uses a 40 ft corded cable. Dolphin Nautilus Titan is listed at 22.6 lb versus 14 lb for Dolphin S50; that 8.600000000000001 lb difference matters when lifting the robot from the pool.
Price, warranty and the decision
Dolphin Nautilus Titan is listed at $1,599 and Dolphin S50 at $649; Dolphin S50 is $950 less. Dolphin Nautilus Titan lists a 1-year warranty compared with 2 years for Dolphin S50. Dolphin Nautilus Titan 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 Titan | Dolphin S50 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | YesEdge | No |
| Scrubs the waterline | YesEdge | No |
| Fine-debris filter included | YesEdge | No |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | YesEdge | No |
| Smartphone app | YesEdge | No |
| Anti-tangle swivel | Yes | 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 Titan stands out
Dolphin Nautilus Titan 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
- Uses 2 active brushes instead of 1
- Can start on a weekly schedule without a manual launch before every cycle
Where Dolphin S50 stands out
Dolphin S50 is the better fit for shoppers prioritizing the lower $649 starting price.
- Carries a 2-year warranty instead of 1 years
- Is listed $950 lower
- Weighs 14 lb versus 22.6 lb
Dolphin Nautilus Titan 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 Titan | Dolphin S50 |
|---|---|---|
| Best fit | Inground pools up to 50 ft that need floor, wall and waterline cleaning with app control. | Above-ground pools up to 30 ft that need floor cleaning. |
| Starting price | $1,599 | $649 |
| Pool type | Inground | Above-ground |
| Maximum pool length | Up to 50 ft | Up to 30 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor |
| Power | Corded | Corded |
| Filtration | Basket, UltraFilter | Basket |
| Scheduling | Weekly schedule + app | One-touch start |
| App and remote | App control | Power-supply controls |
| Cable | Not listed | 40 ft |
| Robot weight | 22.6 lb | 14 lb |
| Warranty | 1 years | 2 years |
Consider the stronger Pool Express option
Dolphin Nautilus Titan 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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