Dolphin M400 Robotic Pool Cleaner vs Dolphin Nautilus CC Plus

The M400 is the stronger cleaner: three brushes, waterline scrubbing, a 2.5-hour cycle and app control, and owners report 5 to 10+ years of use. The Nautilus CC Plus is lighter and simpler, cleans floor and walls only, and suits smaller pools where waterline work matters less. Both are Maytronics Dolphin robots, so build quality is similar; the M400's extra brush and Wi-Fi are what you pay for in capability, not in longevity.

• Choose the Dolphin M400 if your pool is up to 50 feet, you want waterline scrubbing and app scheduling, and you can handle a heavier 12 kg robot.
• Choose the Dolphin Nautilus CC Plus if you have a smaller pool, only need floor and wall cleaning, and want a lighter robot that is easy to lift in and out.