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Buying guides
Short, sourced guides to help you pick the right product. Every number comes from the specs and sources on our comparison pages.
Smart rings
The best smart rings without a subscription in 2026Smart rings that track sleep and health without a monthly fee, compared on battery, weight, price and two-year cost.Oura Ring 5 vs RingConn Gen 3Oura Ring 5 vs RingConn Gen 3 compared on price, membership, battery, weight and features, with a clear verdict.Smart ring buying guide: 7 things to check before you buyWhat actually matters when buying a smart ring: subscription cost, battery, sizing, phone support, charging case, weight and availability.
Air fryers
The best air fryer for your household sizePick the right air fryer capacity for one, two, four or more people, with our top model for each household size.Single or dual basket? Instant Vortex Plus vs Ninja Foodi DualZoneShould you buy a single or dual basket air fryer? We compare the Instant Vortex Plus 6-Quart and Ninja Foodi DualZone 8-Quart.
Robot vacuums
The best robot vacuum and mop combos at every budgetOur picks for robot vacuum and mop combos from about $300 to $1,700, with self-emptying docks, mop washing and obstacle avoidance compared.Robot vacuum buying guide: what the specs actually meanSuction claims, docks, mop types, obstacle avoidance, climbing height and height under furniture, explained in plain English.
Air purifiers
The best air purifier for your room sizeHow to match an air purifier to your room using CADR, plus our picks for small, medium and large rooms.Levoit Vital 200S-P vs Coway Airmega MightyLevoit Vital 200S-P vs Coway Airmega AP-1512HH compared on CADR, room size, noise, filters, Wi-Fi and running cost.