Robot vacuum listings are a wall of specs and Pa numbers. Here’s what actually affects how well one cleans your home.

Suction (Pa): useful, but not everything

Suction is measured in pascals (Pa). More helps on carpet and for pet hair, but past a point it matters less than brush design and how methodically the robot covers the floor. A well-navigating 4,000Pa robot often out-cleans a chaotic 8,000Pa one. Treat Pa as one factor, not the headline.

Navigation: LiDAR vs camera vs random

• LiDAR (a spinning laser) builds an accurate map and cleans in efficient rows, even in the dark. It’s the gold standard for methodical coverage.
• Camera/vSLAM navigation maps using a camera; good, but needs some light and can be less precise than LiDAR.
• “Random bounce” budget robots have no mapping — they ricochet around and miss spots. Fine for light upkeep, frustrating for whole-home cleaning.

Self-emptying docks

A self-empty base sucks the robot’s bin into a larger bag so you only deal with it every month or two — great for convenience and allergies, though it adds cost and the bags are a recurring expense.

Mopping

Many robots now mop. Basic versions just drag a damp pad; better ones lift the pad on carpet, scrub with rotating pads, and even wash and dry the pad at the dock. Mopping handles light spills, not deep stains.

The specs that quietly matter

Battery/run time for larger homes, app features like no-go zones and room-specific cleaning, brush type (rubber brushes tangle less with hair), and dock features. Match these to your floor types and pets.

Bottom line: prioritize good navigation (LiDAR for whole-home) and features that fit your home over chasing the biggest Pa number. Add self-empty and mopping only if you’ll actually use them.

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