Help me choose
A stronger Pool Express option
Aquabot Rapids 2500 and Dolphin S400 are compared feature by feature below. For a stronger Pool Express option, consider Clear S. Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
Aquabot
Aquabot Rapids 2500
Inground and above-ground pools up to 50 ft that need floor, wall and waterline cleaning.
S-Line
Dolphin S400
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
What we recommend instead
Clear S
Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
$1,749
Buy Clear SAquabot Rapids 2500 or Dolphin S400: our take
Aquabot Rapids 2500 and Dolphin S400 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
Aquabot Rapids 2500 is intended for inground and above-ground pools, while Dolphin S400 is 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. Aquabot Rapids 2500 lists Gyroscope navigation. Dolphin S400 lists 2 active brushes and CleverClean navigation.
Filtration and debris
Dolphin S400 has documented included filtration—Basket and UltraFilter—while the other model's included media is not fully published. Dolphin S400 has the clearer documented edge for fine silt, pollen and sand. Dolphin S400 has the better documented path for bulky leaves and larger debris.
Controls and day-to-day ownership
Aquabot Rapids 2500 provides smartphone control; Dolphin S400 provides a weekly timer and smartphone control.
Price, warranty and the decision
Aquabot Rapids 2500 is listed at $999 and Dolphin S400 at $1,799; Aquabot Rapids 2500 is $800 less. Each lists a 2-year manufacturer warranty. Aquabot Rapids 2500 and Dolphin S400 each have a specific fit, but neither is the Pool Express pick for this job. Our better alternative is Clear S. 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 | Aquabot Rapids 2500 | Dolphin S400 |
|---|---|---|
| Cleans the pool floor | Yes | Yes |
| Climbs and cleans walls | Yes | Yes |
| Scrubs the waterline | Yes | Yes |
| Fine-debris filter included | No | YesEdge |
| Large-debris filter | No | YesEdge |
| Automatic scheduling | Not listed | Yes |
| Smartphone app | Yes | Yes |
| Anti-tangle swivel | Not listed | Yes |
| 3-year warranty | No | No |
| No recharging between cycles | Not listed | 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 Aquabot Rapids 2500 stands out
Aquabot Rapids 2500 is the better fit for shoppers prioritizing the lower $999 starting price.
- Adds gyroscope-assisted navigation
- Is listed $800 lower
Where Dolphin S400 stands out
Dolphin S400 is the better fit for inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
- Includes filtration for sand, pollen and other fine debris
- Includes a large-debris bin or bag for leaves
Aquabot Rapids 2500 vs Dolphin S400 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 | Aquabot Rapids 2500 | Dolphin S400 |
|---|---|---|
| Best fit | Inground and above-ground pools up to 50 ft that need floor, wall and waterline cleaning. | Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris. |
| Starting price | $999 | $1,799 |
| Pool type | Inground, Above-ground | Inground |
| Maximum pool length | Up to 50 ft | Up to 50 ft |
| Cleaning coverage | Floor, Walls, Waterline | Floor, Walls, Waterline |
| Power | Not listed | Corded |
| Filtration | Not listed | Basket, UltraFilter |
| Scheduling | Not listed | Weekly schedule + app |
| App and remote | App control | App control |
| Cable | Not listed | 60 ft with anti-tangle swivel |
| Robot weight | Not listed | Not listed |
| Warranty | 2 years | 2 years |
Consider the stronger Pool Express option
Aquabot Rapids 2500 and Dolphin S400 are compared feature by feature below. For a stronger Pool Express option, consider Clear S. Inground pools up to 50 ft that need floor, wall and waterline cleaning, with fine debris.
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