Beatbot AquaSense 2 Ultra vs Dolphin (Maytronics) Sigma
Researched by Riley Hart · prices checked Oct 26, 2026
As of Oct 26, 2026, the Beatbot AquaSense 2 Ultra costs $2,299 and the Dolphin (Maytronics) Sigma costs $2,999, so the Beatbot AquaSense 2 Ultra is $700 cheaper. Pick the Beatbot AquaSense 2 Ultra for large pools with surface debris. Pick the Dolphin (Maytronics) Sigma for set and forget in-ground pools.
- Cleans
- Floor to surface
- Power
- Cordless
- Runtime
- Up to 5 h floor
- Max pool
- 3,444 to 3,875 sq ft
The most complete cordless cleaner here: it handles the floor, walls, waterline and the water surface in one robot, and independent reviewers found it cleaned very well. It is heavy at about 29 lb, loses its app connection underwater, and still costs close to two thousand dollars on sale. Skip it if you have a small pool or would rather pay less for a corded robot on a weekly timer.
Full Beatbot AquaSense 2 Ultra review →- Cleans
- Floor
- Power
- Corded
- Runtime
- 2.5 h cycle
- Max pool
- 50 ft long
The pick for in-ground owners who want the most automated corded Dolphin: app control, a weekly timer and strong waterline scrubbing with no battery to wear out. It is the most expensive robot on this list and does not skim the surface. Skip it if you do not need the app; the Premier cleans similarly for less.
Full Dolphin (Maytronics) Sigma review →Side by side
| Beatbot AquaSense 2 Ultra | Dolphin (Maytronics) Sigma | |
|---|---|---|
| Price | $2,299 | $2,999 |
| 3 year cost | $2,299 | $3,099 |
| Our score | Not scored yet | Not scored yet |
| Rank in Pool | #16 | #17 |
| Status | on sale | on sale |
| Warranty | 3 years full replacement | 3 years |
| Pool types | In-ground and above-ground; concrete, vinyl, fiberglass, tile, stainless steel; saltwater under 5,000 ppm; depth 1.31 to 9.84 ft | In-ground; rectangular, round, free shape, kidney |
| Cleans | Floor, walls, waterline, water surface, plus water clarification | Floor, walls, waterline |
| Power | Cordless, 13,400 mAh lithium-ion | Corded |
| Runtime | Up to 10 h surface, 5 h floor, 4.5 h walls and waterline (maker claim) | Default 2.5 h cycle; no battery |
| Charge time | About 4.5 h | None (corded) |
| Filter | Two layer 150 µm and 250 µm, dual baskets of 4.0 L and 3.7 L | Extra large multi layer top load basket; fine filter plus ultra fine kit in box |
| Max pool size | Maker lists 3,444 sq ft per cycle in its FAQ and 3,875 sq ft pool floor in its spec table | Pools up to 50 ft long |
| App | Beatbot app over Wi-Fi or Bluetooth; AI camera mapping with 27 sensors; app works only when robot is at the surface | MyDolphin Plus app over Wi-Fi with scheduling and automation |
| Weight | 29.1 lb | 24.63 lb |
| Warranty | 3 years | 3 years |
| Suction | n/a | 4,500 gph (maker) |
| Timer | n/a | Weekly timer |
| Best for | large pools with surface debris | set and forget in-ground pools |
| Skip if | you want to lift under 20 lb | you do not care about app control |
Specs are maker claims unless a reviewer is named. Prices from the stores we link, checked daily.
What reviewers found
Beatbot AquaSense 2 Ultra
- Reviewed: Did an excellent job on bottom and sides and left clear water, but could not clean the shallow tanning area or Baja shelf, lost Wi-Fi underwater, and its near 30 lb weight was hard to haul. Source
- Android Authority: Editor's Choice; pulled more debris, including small rocks, from an already clean pool than other robots tested. Downsides were bulk, price, and one failed charge due to wet contacts. Source
- The Pool Nerd: Named best cordless pick in its 2026 roundup but still labeled it Pool Nerd Disapproved, citing mesh filtration at flagship price and the daily charge and haul routine. The site prefers corded robots and earns affiliate commissions. Source
Dolphin (Maytronics) Sigma
- The Pool Nerd: Ranked it the best robot the site has tested; the center brush rolled over the main drain every time in weeks of daily testing and its waterline cleaning was the strongest of any Dolphin tried. Affiliate site with links to Dolphin dealers. Source
Pros and cons
Beatbot AquaSense 2 Ultra
Pros
- Cleans floor, walls, waterline and surface
- Long rated runtime for a cordless robot
- Reviewers saw strong pickup, including small rocks
- 3 year full replacement warranty
Cons
- About 29 lb to lift out of the pool
- App loses connection underwater
- Reviewer found it missed a shallow tanning ledge
- Still expensive even at the sale price
Dolphin (Maytronics) Sigma
Pros
- Weekly timer means no daily handling
- App control and scheduling over Wi-Fi
- Strong waterline cleaning per The Pool Nerd
- 3 year warranty
- No battery to degrade
Cons
- Highest price here
- Cord to manage
- In-ground only
- Center drain brush is an extra add on
Questions buyers ask
Which is better, the Beatbot AquaSense 2 Ultra or the Dolphin (Maytronics) Sigma?
Pick the Beatbot AquaSense 2 Ultra for large pools with surface debris. Pick the Dolphin (Maytronics) Sigma for set and forget in-ground pools.
Which is cheaper?
The Beatbot AquaSense 2 Ultra at $2,299, versus $2,999 for the Dolphin (Maytronics) Sigma, checked Oct 26, 2026. Over 3 years with running costs: $2,299 vs $3,099.
What is the difference between the AquaSense 2 Ultra and the Sigma?
Pool types: In-ground and above-ground; concrete, vinyl, fiberglass, tile, stainless steel… on the AquaSense 2 Ultra, In-ground; rectangular, round, free shape, kidney on the Sigma. Cleans: Floor, walls, waterline, water surface, plus water clarification on the AquaSense 2 Ultra, Floor, walls, waterline on the Sigma. Power: Cordless, 13,400 mAh lithium-ion on the AquaSense 2 Ultra, Corded on the Sigma.
Also consider
See all ranked →More comparisons
- Beatbot AquaSense 2 Ultra vs Dolphin (Maytronics) Premier
- Aiper Scuba X1 Pro Max vs Beatbot AquaSense 2 Ultra
- Beatbot AquaSense 2 vs Beatbot AquaSense 2 Ultra
- Beatbot AquaSense 2 Ultra vs Beatbot Sora 70
- Dolphin (Maytronics) Premier vs Dolphin (Maytronics) Sigma
- Aiper Scuba X1 Pro Max vs Dolphin (Maytronics) Sigma
- Dolphin E10 vs Dolphin (Maytronics) Sigma
All robotic pool cleaners, ranked
See the ranking →Affiliate links. We may earn a commission. It never changes our score. Disclosure