Help me choose
A stronger Pool Express option
Dolphin Nautilus Titan and Dolphin Proteus DX5i 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 Titan
Inground pools up to 50 ft that need floor, wall and waterline cleaning with app control.
Proteus
Dolphin Proteus DX5i
Inground pools up to 50 ft that need floor, wall and waterline cleaning.
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 Titan or Dolphin Proteus DX5i: our take
Dolphin Nautilus Titan and Dolphin Proteus DX5i 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 pools. Both are rated for pools up to 50 ft. Each cleans floor, walls, and waterline, so coverage alone does not separate them. Dolphin Nautilus Titan lists 2 active brushes and CleverClean navigation. Dolphin Proteus DX5i lists 1 active brush.
Filtration and debris
Dolphin Nautilus Titan includes Basket and UltraFilter; Dolphin Proteus DX5i 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 Proteus DX5i provides smartphone control. Dolphin Nautilus Titan uses continuous corded power, while Dolphin Proteus DX5i uses a 60 ft corded cable with an anti-tangle swivel.
Price, warranty and the decision
Dolphin Nautilus Titan is listed at $1,599 and Dolphin Proteus DX5i at $1,299; Dolphin Proteus DX5i is $300 less. Dolphin Nautilus Titan lists a 1-year warranty compared with 2 years for Dolphin Proteus DX5i. Dolphin Nautilus Titan and Dolphin Proteus DX5i 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 Titan | Dolphin Proteus DX5i |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | Yes | Yes |
| Scrubs the waterline | Yes | Yes |
| Fine-debris filter included | YesEdge | No |
| Large-debris filter | Yes | Yes |
| Automatic scheduling | Yes | Not listed |
| Smartphone app | Yes | Yes |
| Anti-tangle swivel | Yes | Yes |
| 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 inground pools up to 50 ft that need floor, wall and waterline cleaning with app control.
- Includes filtration for sand, pollen and other fine debris
- Uses 2 active brushes instead of 1
Where Dolphin Proteus DX5i stands out
Dolphin Proteus DX5i is the better fit for shoppers prioritizing the lower $1,299 starting price.
- Carries a 2-year warranty instead of 1 years
- Is listed $300 lower
Dolphin Nautilus Titan vs Dolphin Proteus DX5i 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 Proteus DX5i |
|---|---|---|
| Best fit | Inground pools up to 50 ft that need floor, wall and waterline cleaning with app control. | Inground pools up to 50 ft that need floor, wall and waterline cleaning. |
| Starting price | $1,599 | $1,299 |
| Pool type | Inground | Inground |
| Maximum pool length | Up to 50 ft | Up to 50 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor, Walls, Waterline |
| Power | Corded | Corded |
| Filtration | Basket, UltraFilter | Basket |
| Scheduling | Weekly schedule + app | Not listed |
| App and remote | App control | App control |
| Cable | Not listed | 60 ft with anti-tangle swivel |
| Robot weight | 22.6 lb | Not listed |
| Warranty | 1 years | 2 years |
Consider the stronger Pool Express option
Dolphin Nautilus Titan and Dolphin Proteus DX5i 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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