The short answer
- Buy Dolphin if you want the most thorough clean — real scrubbing brushes, waterline cleaning, fine filtration, and a proven reliability record — and you don't mind a cord and a power outlet near the pool.
- Buy Aiper if you want cordless convenience, the best value, and an easy drop-in/lift-out experience, and your pool mainly needs the floor and walls kept clean.
Dolphin vs Aiper at a glance
- Power — Dolphin: corded (constant power). Aiper: cordless (battery).
- Cleaning style — Dolphin: rotating scrubbing brushes. Aiper: mostly vacuum / lighter brushing.
- Coverage — Dolphin: floor + walls; waterline on ProLine and upper models. Aiper: floor + walls (waterline on top models).
- Convenience — Dolphin: cord to manage, lift out by hand. Aiper: no cord, easy drop-in.
- Reliability record — Dolphin: longest in the category. Aiper: newer, improving fast.
- Warranty — Dolphin: 2–3 yrs (3 yrs on ProLine via dealer). Aiper: standard.
- Price — Dolphin: $$ – $$$. Aiper: $ – $$.
Cleaning power and scrubbing
This is Dolphin's strongest card. Dolphin robots use rotating scrubbing brushes that physically scrub the pool surface, lifting algae and stuck-on grime — not just vacuuming loose debris off the floor. Many of Aiper's cordless models lean on suction with lighter or static brushing, which is excellent for leaves, dirt and silt but doesn't scrub a surface the way a Dolphin does.
If your pool battles algae or a filmy surface, that scrubbing difference is real and noticeable. If your pool mainly collects leaves and dust, Aiper's vacuuming is more than enough.
Edge: Dolphin for deep scrubbing; Aiper is plenty for typical debris.
Coverage: floor, walls, waterline
Both brands climb walls. The dividing line is the waterline — the scum line where oils, sunscreen and algae cling. On Dolphin, true waterline cleaning is reserved for the ProLine tier (Premier, Sigma, Quantum) and some upper Explorer models; the popular Amazon Nautilus models (CC, CC Plus) climb walls but skip the waterline. On Aiper, waterline cleaning shows up only on the higher-end models.
Edge: Dolphin at the top of its range; tie in the mid-range.
Filtration
Dolphin's premium models use NanoFiltration — fine pleated cartridges that trap microscopic particles and even help absorb the oils that cause scum lines. The flagship Premier goes further with Multi-Media (fine, nano, and an oversized leaf bag). Aiper uses capable multi-stage filtration that handles typical debris well, with finer options on higher models, but Dolphin's NanoFilter is the benchmark.
Edge: Dolphin, especially on its NanoFilter-equipped models.
Convenience
This is Aiper's whole reason for existing, and it wins decisively. No cord to untangle, nothing trailing across hot decking, no need for an outlet by the water, and you drop it in and pull it out in seconds. A Dolphin means managing a floating cable (an anti-tangle swivel helps on better models) and a power supply near the pool.
Edge: Aiper, clearly.
Reliability and warranty
Dolphin has the longest reliability track record in pool robotics — these are the machines that built the category, and many last well beyond five years. ProLine models bought through an authorized dealer carry a 3-year warranty. One catch: many Nautilus units sold on Amazon come with a restocking fee (often 15–20%) if you return them — buy ProLine through an authorized dealer to avoid that and get the full warranty.
Aiper is newer, so its long-term record is shorter, but the brand has matured quickly and backs its cleaners with proper U.S. support. As with any cordless device, the battery is a wear item that loses capacity over years — something corded Dolphins never face.
Edge: Dolphin on proven longevity; Aiper is closing the gap.
Price and value
Aiper owns value. You can get into a capable Aiper cordless cleaner for less than most comparable Dolphins, and the range covers nearly every budget. Dolphin asks more — but at the top end you're paying for scrubbing, waterline cleaning, NanoFiltration, and a reliability record that justifies it for serious pool owners.
Edge: Aiper on value; Dolphin earns its premium for thorough, long-term cleaning.
So which should you buy?
Choose Dolphin if you want the most thorough clean, with real scrubbing and waterline cleaning; your pool fights algae or cloudy water (NanoFiltration helps a lot); and you value a proven, long-lasting machine and have an outlet near the pool. Best picks: Dolphin Premier for top-tier cleaning, Dolphin Cayman for value, or Nautilus CC Plus as a budget Amazon pick (check the return terms).
Choose Aiper if you want cordless convenience and the best value; your pool mainly needs the floor and walls kept clean; and you'd rather not deal with a cord or buy a four-figure machine. Best picks: Aiper Scuba S1 for value, Scuba X1 for a step up with more coverage, or Scuba SE on a budget.
Want cordless convenience and full coverage? Look at the premium cordless crowd — the Beatbot AquaSense 2 cleans floor, walls and waterline without a cord; the Mammotion Spino E1 brings smart navigation at a budget price.