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• Best Ultrasonic Diffuser

  Photograph: Louryn Strampe

  Urpower

  Aroma Essential Oil (2nd Gen)

  Sometimes the simplest product is the best, and that’s the case here. The Urpower Aroma scent diffuser doesn’t have too many bells and whistles, but it works and it works well. There are two buttons on its housing: one to turn on the mist and set a timer (choose between 60, 180, or 360 minutes, or just leave it on), and the other to cycle among seven different colored lights (or turn them off entirely). You fill the little tank with water and add a few drops of your chosen scented oil. The tank holds enough water to run for about six or seven hours, and the diffuser will shut off automatically once the tank is empty.

  It puts out quite a bit of steam, which I personally found soothing during the dry winter while I was testing it. The scent strength and longevity depends on how many drops of oil you add to the tank. Note that the lid doesn’t lock onto the tank, so you’ll want to keep it in a stable place away from kids and pets (as you would with any other household tech).

  Type	Ultrasonic
  Additional Features	Light
  Oil Type	Bring your own
  Remote?	No

• Best Nebulizer

  Photograph: Kat Merck

  I first learned about Pura from a friend whose house always smelled like a high-end boutique under every circumstance. Cooking project, water leak … no matter what was going on in her house at the time, I only ever smelled berries. I have two cats and a multi-sports-playing tween—I knew I needed this. Now, about 17 months into my Pura journey, I have some thoughts.

  While most of my time has been with the now discontinued Pura 3, I have also since used the Pura 4 and new large-room Pura Plus, all of which have dual bays for two of Pura’s proprietary oil cartridges. The Pura 3 and 4 both plug into an outlet and can only be controlled through the accompanying app (or Alexa or Google Home). This is convenient for setting schedules and timers, switching fragrances, and changing the color of the optional night-light, but there have also been numerous occasions where I’ve wanted to stop or start or change a schedule but have been unable to because I forgot my password or the diffuser couldn’t connect to Wi-Fi. In the moment, it was infuriating. Mercifully, the stand-alone, cylindrical Pura Plus has manual control buttons on the front. The smaller Pura 4 really is best for enclosed spaces, like a long entryway or a bedroom (note that both only work with 2.4-Ghz Wi-Fi). If you have high ceilings or any kind of open floor plan, you’ll get better results from the Pura Plus. Just note that, unlike the silent Pura 4, the Plus emits an audible whooshing sound that’s actually quite loud—32 decibels, as loud as a fan on low.

  Another disappointing feature is the extremely varied quality among cartridge brands. I’ve experienced undetectable scents, chip stickers that arrive detached or register the wrong fragrance (the diffusers automatically scan the chips to show the fragrances in the app), and vial tops so stuck on they required pliers. Given that the cartridges run $11 to $17 for 0.33 ounces, I’m of the opinion this shouldn’t be happening. That said, Pura is known for its clean, upscale oils that are safe for pets and families, and on this it delivers. There’s an extensive selection of seasonal and year-round cartridges from companies like Nest, Anthropologie, and Capri Blue, and I’ve loved all but maybe one of the dozen or so I’ve tried. Because of the small size and price of the cartridges, Pura might not be the best choice if you want to smell diffuser all day, every day, as you’ll end up spending a small fortune. However, if you love unique luxury scents and only need them occasionally and/or on demand, Pura is the way to go. —Kat Merck

  Type	Nebulizer
  Additional Features	Smart features (requires 2.4-GHz Wi-Fi), night-light
  Oil Type	Proprietary
  Remote?	No