Best essential oil diffusers

Top pick: Vitruvi Stone Diffuser. It's the one I'd buy for a main room: a real 8-hour run time, a 4-hour continuous or 8-hour intermittent setting, and enough output for a large living room (rated to about 500 sq. ft.). The ceramic-look body looks like decor rather than an appliance, and it has the deepest review history of anything here.

Who the others suit:

• MUJI Ultrasonic Aroma Diffuser — small bedrooms and desks; gentle, with a 30-min to 3-hour timer and warm light.
• Rowe Casa Glass & Concrete Diffuser — anyone who wants a design piece on a shelf; simple 4/8-hour timer.
• Now Ultrasonic Real Bamboo — a natural wood look at a modest size.
• Airomé / Better Homes & Gardens / Mainstays — first diffuser or a spare for a kid's room; basic but well rated.
• Noahstrong 500ml — big tank, long sessions, no fuss.
• 2-in-1 Salt Lamp Diffuser — you want mood lighting and scent in one.

Skip the tiny 3 oz and novelty jellyfish units if you're scenting a whole room.