The 4 best essential oil diffusers of 2026, tested and reviewed
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Whether you're getting into aromatherapy or want a signature scent without the open flame of the best candles, the best essential oil diffuser naturally and safely spreads fragrance through your space. There are two main types of diffusers: ultrasonic and nebulizing. Ultrasonic diffusers evaporate water to carry essential oils through a space, while nebulizing diffusers use a burst of air for a highly concentrated fragrance.
To find the best essential oil diffuser, we tested nine options and talked with Amanda Lattin, dean of aromatherapy at American College of Healthcare Science. Our top pick is the Asakuki 500 mL Premium Essential Oil Diffuser, an easy-to-use option with a large water tank and adjustable time and mist settings. I also recommend the Pura 4 Smart Fragrance Diffuser, a waterless option with an accompanying app.
Read more about how Business Insider Reviews tests and research home products here.
Our picks for best essential oil diffusers
Best overall: Asakuki 500 mL Premium Essential Oil Diffuser - See at Amazon
Best smart: Pura 4 Smart Fragrance Diffuser - See at Amazon
Best compact: Urpower 2nd Generation Essential Oil Diffuser - See at Amazon
Best waterless: Organic Aromas Raindrop Nebulizing Diffuser - See at Amazon
Best overall
This diffuser has the features experts look for. According to Lattin, an important feature to consider in an oil diffuser is a timer for a customized run time, and the Asakuki has just that. One of the standout features of the Asakuki model, which contributed to its position as the best overall essential oil diffuser, is the simple inclusion of a remote. It conveniently lets me set a timer, change the LED lighting, and control how soft or powerful I want the mist to be from wherever I'm sitting.
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It has a large tank, so it has a long run time and takes up a bit of space. The Asakuki also impressed with its large 500 mL water tank, which means you won't have to refill it frequently. In my testing, I ran it for a full 16 hours before needing to refill the reservoir. Another plus for this diffuser is how easy it is to clean with water and a few drops of white vinegar. The only downside of this diffuser is its 6.6-inch diameter. Most of the diffusers we tested are more slender. I recommend placing it on a wide surface such as a side table, desk, or counter.
It spreads scents efficiently. The Asakuki diffuses oils well in rooms of all sizes without being too overpowering. It filled up my 180-square-foot bedroom and my 220-square-foot living room, which has a 25-foot-high ceiling.
Best smart
Pura has aced the formula for a smart essential oil diffuser. The Pura V4 Smart Fragrance Diffuser is a plug-in diffuser that works exclusively from the Pura app, which allows you to adjust the fragrance's intensity and set a schedule for when you want your Pura to diffuse. The app was super easy to use with detailed step-by-step instructions, and connecting the Pura to my WiFi took less than a minute. When using smart vials, the latest Pura 4 automatically detects which fragrance vial is inserted with an NFC chip and tracks usage and the remaining amount of fragrance.
I loved the exclusive scents and collaborations. You can choose from more than 100 fragrances, including partnerships with some of the best candle brands like Capri Blue, Otherland, LAFCO, and NEST NY. The downside is that the diffuser is only compatible with Pura's essential oils vials. If you aren't sure which fragrance to choose from, the company offers a fragrance quiz that will match you with a few scents based on your answers. The vials cost between $10 to $20, which is typically still less costly and longer lasting than a candle. Each vial should last up to 120 hours, depending on the intensity you put it at. Within the app, you can purchase refills and set up subscriptions too.
For my tests, Pura sent four fragrance vials. My favorite was the Capri Blue Volcano vial, the same scent as the iconic candle. With the Pura Diffuser's adjustable fragrance intensity, both scents diffused well across my open floor plan and vaulted ceilings.
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I love how easy it is to control. Everyone in my house was amazed by how I could control this smart diffuser from anywhere, even outside the house. I loved turning it on when I had guests over to welcome them with a great-smelling space. With its ease of use, convenient app features, LED color wheel lighting, and amazing fragrances, this is by far the best smart diffuser. It's great not having to worry about cleaning this diffuser because it's completely waterless and uses heat to diffuse oils.
Pura also sells a tabletop unit. Pura also introduced the Pura Plus, which is designed to be shown off and is a more traditional tabletop unit, and is well-suited to large rooms with higher ceilings. It uses the same vials and can be controlled via the app or directly from the diffuser.
Best compact
It's compact and affordable. The Urpower 2nd Generation Essential Oil Diffuser is small but mighty, and you get all of the benefits of an essential oil diffuser without spending a lot of money. If you're someone who doesn't care for fancy features, this 100-mL diffuser nicely saturates small rooms with essential oils.
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It isn't fancy, but it has all the necessary features. Despite having a smaller water capacity, the Urpower has a run time of six hours, which is longer than some diffusers we tested that have a larger reservoir. Although this diffuser isn't the fanciest, it has seven LED mood lights and automatically shuts off after its run time is complete. The instructions don't specify how to clean the Urpower, but water and a few drops of white vinegar worked well for me.
Best waterless
Nebulizing diffusers solely diffuse essential oils. With ultrasonic diffusers, "essential oils just sit on top of the water, so the diffuser is making it to where droplets of water are coming out, and there are little bits of essential oils riding on those droplets of water," said Lattin. With a nebulizer, a stream of pressurized air hits the essential oil, and it is ultimately released into the air as a mist of very small particles. This more complicated design makes them more of an investment.
It uses less essential oils than you think. With the Organic Aromas Raindrop Nebulizing Diffuser being my first waterless diffuser, I didn't know what to expect. Lattin says a few drops of essential oil in a nebulizing diffuser goes a long way. Although the brand recommends adding 20 to 25 drops, I took Lattin's advice and added four drops of essential oil inside the glass reservoir.
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It's the most powerful diffuser I tested. Even though Organic Aromas says its diffuser can cover up to an 800-square-foot room, I raised the intensity level just a bit, and within seconds, I could smell the essential oils throughout my entire 2,924-square-foot home. This waterless diffuser has a two-hour run time, but given how strongly it dispenses oils, this is more than sufficient time. Plus, I could still smell the fragrance lingering once the diffuser automatically shut off.
Cleaning this diffuser is time consuming. Cleaning the Raindrop Nebulizing Diffuser was simple but took some time due to how strong the oils are. I removed the glass pieces, placed them into a bowl of hot water and dish soap, and repeated this process until I couldn't smell the essential oils as strongly. Once the pieces finished soaking, I rinsed them off with water and let them completely air dry before reassembling.
What to look for in a fragrance diffuser
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When it comes to essential oil diffusers, there are three types of dispersing methods as well as several important features you should know about.
- Ultrasonic diffusers use a high-frequency vibration to disperse an oil and water mixture. They are a good choice for enclosed areas with low humidity, acting as both humidifiers and oil diffusers.
- Nebulizing diffusers require no heat or water and disperse just essential oils. They produce a more potent scent but use much more oil than other types of diffusers.
- Evaporative diffusers don't use water, and essential oils are placed on a filter and circulated by a fan.
Once you've settled on a diffusing method, the choices are nearly endless when it comes to features like settings, coverage area, and aesthetic appeal. Some things to consider before you make a purchase:
- Automatic shutoff: This feature prevents damage if an ultrasonic diffuser runs dry.
- Lighting: Many models have an LED light feature. Read carefully to determine the color of the light and whether it can be manually controlled if you don't want it on all the time.
- Intensity: Are the diffuser settings continuous, intermittent, or both? Nebulizing diffusers produce a stronger output than other models.
- Capacity and coverage: If you choose an ultrasonic diffuser, the water capacity can range from 3 to 32 ounces. The larger the capacity, the more square footage it will cover.
- Timers: A timer can help you control short or continuous runs and prevent damage if the diffuser is accidentally left on too long.
How we tested essential oil diffusers
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When testing each of the picks for the best essential oil diffusers, I ran each one in different size rooms over a span of two months. I observed how well they diffused oil, their ease of use and cleaning, and their water capacity. I also interviewed Amanda Lattin, dean of aromatherapy at American College of Healthcare Science, about essential oils and diffusers.
Below are the criteria we used to determine the best essential oil diffusers.
Ease of use: After unboxing the diffusers, I made a note of how easy or difficult it was to set up each one. For the app-enabled smart diffusers, I noted how quickly I was able to connect the diffuser to WiFi and my phone along with how user-friendly the app was. Most diffusers require water and a few drops of essential oil and will start up with a click of a button. For ones that require more steps, I considered whether their performance outweighed the extra effort.
Ease of cleaning: Along with ease of use, I made note of how tedious or simple it was to clean each diffuser.
Run time and water capacity: I filled each diffuser to its maximum water capacity and noted how many hours it diffused the oils and how often I had to refill the diffuser. For nebulizing diffusers, I considered how much time was needed to diffuse oils throughout a room.
Strength of essential oils in each diffuser: I kept track of how many drops of essential oils I added to each diffuser based on its recommended amount and noted how strongly the fragrance dispersed from each diffuser. I also observed how long the oil's scent lasted in the room once the diffuser stopped running.
Square footage covered: To test the strength of each diffuser, I ran each diffuser in my 180-square-foot bedroom; 220-square-foot living room, which has a 25-foot-high ceiling; and my 200-square-foot office.
Essential oil diffuser FAQs
What are essential oils?
Lattin said that essential oils are extracted from the flowers, seeds, roots, peel, bark, or leaves of a plant. She also said that genuine essential oils should have information about where it was produced, and manufacturers will often link to analysis reports of their oils
How do you clean an essential oil diffuser?
It depends on the type of diffuser you have. Generally, you'll need to wash the reservoir with white vinegar, water, and dish soap after one to two uses.
For more information, check out our story on how to clean your essential oil diffuser.
Are essential oils harmful to babies and children?
John Hopkins All Children's Hospital recommends taking precautions when using essential oils around children, and also notes that their use can have benefits. Never use concentrated essential oils on a child's skin, and be sure to store them out of reach. Pepppermint oil has been known to cause seizures in children under 30 months old.
Are essential oils harmful to pets?
The ASPCA Animal Poison Control Center (APCC) notes that concentrated essential oils can be harmful to pets if they consume them or touch them. The APCC says to only use diffusers for a short period of time with pets, and not to use them at all if you have birds, since oils can irritate their sensitive respiratory tracks.
Where should I put an essential oil diffuser in a room?
Put your diffuser in a spot with good airflow that's out of reach of children and pets. Avoid placing it near delicate surfaces or electronics, especially if you're using a water-based diffuser.
What are the benefits of essential oil diffusers?
Using essential oils daily has been proven to loewr stress, promote healthy sleeping habits, and reduce inflammation.
But don't use your diffuser too much. "You can end up inhaling too much or interacting with it too much if it diffuses all day or all night, which can cause irritation," says Lattin. "You'll want to start out by diffusing for short periods of time during the day to see how well you tolerate it, and setting up your diffuser in an area that isn't too close."
What essential oils are good for sleep?
The best essential oils for sleep include lavender, chamomile, and peppermint, though it depends on your personal preference.
Lavender oil calms nerves and reduces inflammation. Because of this, lavender aromatherapy is widely used in sleep products and is often the main oil used in premade essential oil sleep blends. Chamomile oils work like a warm cup of chamomile tea, promoting relaxation and drowsiness. If you can't fall asleep due to a stuffy nose or upset stomach, peppermint oil can reduce pain and aid digestion.