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Our Top Choice

ZAQ Dew Multi Color Litemist Aromatherapy Essential Oil Diffuser

Pros: Great price and very durable. Features led lights; you can pick your favorite color (or none at all), which is more soothing than you might think.

Cons: Very fussy about hard water.

Summary: An extremely reliable unit that does what it is supposed to, covers a large area, and uses little oil. You simply can't go wrong with this one.
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MIU COLORĀ® 500ml Aroma Diffuser Ultrasonic Humidi...

Pros: A good diffuser; the diverse lighting effects are dramatic, varied, and impressive.

Cons: Some concerns about build quality.

Summary: It works well enough, but this is made for people who really want great lighting effects.
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Now Foods Ultrasonic Oil Diffuser

Pros: Unique in that it uses absolutely no heat to work; it is built quite well.

Cons: Claims to last for up to 8 hours but lasts about half that long.

Summary: Very good unit but doesn't last as long as the manufacturer claims and that is a concern.
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BriteLeafs 2-in-1 Ultrasonic Aroma Diffuser Ultras...

Pros: It is both an oil diffuser and a humidifier, and it handles both functions well. Soothing lights, too.

Cons: It is a good diffuser and good humidifier, but it just falls short of being a great unit for both functions.

Summary: If you need a decent diffuser and a small capacity humidifier, this is one to consider.
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Greenair Spa Vapor + Advanced Wellness Instant Hea...

Pros: Budget friendly entry price. Uses regular tap water just fine. Built with corrosion fighting in mind; soothing LED lights in six colors.

Cons: A bit of a chore to fill, and the build quality is questionable on some units.

Summary: This is a basic unit that works well and comes at a very low price. The best value for your money.