Short answer

Most homes are fine with spinning mop pads. They cost less, have fewer parts to go wrong and handle everyday dirt well. Choose a roller mop if you regularly deal with spills, mud or sticky mess, for example with young children, pets or a garden door.

01

How each system works

  • Spinning mop pads. Two round pads press down and rotate as the robot moves. The dock washes and usually dries them between runs. It's the most common system, and it's well proven.
  • Roller mop. A long roller turns against the floor like a paint roller. It's kept wet with clean water as it cleans, and a scraper strips off the dirty water, which goes back to the dock. Because the roller is cleaned continuously, it keeps working on bigger, wetter messes where pads would get saturated.
  • Mop plate. A flat pad dragged behind the robot. Fine for a light wipe, but weakest on dried-on marks. It's mostly found on cheaper robots.
02

Side by side

Spinning padsRoller mop
Everyday dust and light marksGoodGood
Large spills, mud, sticky messCan struggleBetter
PriceLowerUsually higher
Parts that can failFewerMore
Best forMost homesBusy, messy homes
03

Which should you choose?

  • Choose spinning pads if your floors mostly collect dust, crumbs and footprints, and you'd rather keep the cost down.
  • Choose a roller mop if spills and mud are a weekly event, not an occasional one.
  • Consider no mop at all if your home is mostly carpet. But few robots worth buying today come without one, so you may not save much by skipping it.
04

Picks

These picks draw on buying advice from @vacuumnerds and on our robot profiles. See each profile for the full evidence.

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