The 10 best essential oil diffusers in 2021

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Whether you are looking for stress relief or relaxation, using essential oils can help you experience the benefits of aromatherapy. You can use these oils during massages, in a warm bath, or just by smelling the contents of the bottle. But Alison Seponara, a licensed professional consultant and anxiety therapist from MS, LPC, Pennsylvania, said that one of the best ways to use essential oils to relieve anxiety and relax is to use a diffuser.

There are various essential oil diffusers on the market, and although they look different, they are all designed to spread the healing fragrance throughout the room. The diffuser disperses oil in the form of a breathable mist and is a safe and popular alternative to synthetic air fresheners and scented candles.

We have studied dozens of essential oil diffusers and evaluated their reviews, safety, design, value, coverage area, capacity, mist output and additional functions. Based on these factors, each essential oil diffuser selected is the best.

This is the best essential oil diffuser on the market.

Final verdict

If you are looking for an essential oil diffuser that is reliable and will not go bankrupt, then the Tagital Aroma essential oil diffuser (check it at Walmart) is a good choice. It has four atomization modes, and you can control its running time by automatically turning off the timer. The diffuser is designed with wood grain coating and colorful LED lights, and it can also add decorative elements to any room.

If you are willing to spend a little more money, the VITRUVI porcelain essential oil diffuser (check on Amazon) will not let you down. It has a sleek and attractive contour and emits a candle-like light. Some outstanding features include automatic shutdown, wireless design, and up to eight hours of runtime.

What to look for in an essential oil diffuser



The most common type of essential oil diffuser is the ultrasonic diffuser. This method uses ultrasonic vibration to decompose a mixture of water and essential oils to produce a cool mist while humidifying the air.

Alison Seponara, MS, LPC prefer this diffusion method because it only requires a small amount of essential oil to wrap a person’s space in a long-lasting fragrance. She added that ultrasonic diffusers are usually easy to operate.


As the most powerful and fastest resolution mode, the atomized essential oil diffuser uses pressurized air to emit a fine mist-which means that the essential oil is released in the purest form.

Because of its effectiveness, this method is often used for therapeutic benefit. On the other hand, the atomizing diffuser does bring more noise and usually produces a buzzing sound.


Evaporative essential oil diffuser disperses aromatic oil through evaporation. There are two styles of this type of diffuser, with fan and without fan.

A traditional evaporative diffuser contains a mat or filter to contain essential oils and an internal fan to circulate oil particles throughout the room. The simplified version does not have a fan and relies on natural airflow to spread the fragrance. Evaporative diffusers are usually economical and very suitable for smaller spaces.


As the name suggests, the hot essential oil diffuser heats the oil until the particles evaporate and disperse into the air.

The most effective heat spreaders use low levels of heat to evaporate oil molecules slowly and evenly into the air. The heating source can come in many forms, including electricity, candles or light rings (similar to ring lights). Each style uses a tray to place the oil near the heat source. The disadvantage of this method is that heat changes the chemistry of essential oils and in some cases limits its benefits.

Timer and automatic shutdown

The timer allows the user to run the diffuser during a set continuous or intermittent running time without having to manually start and stop each session. This also helps to save oil. For those who like to diffuse the fragrance at night, it is helpful to set a timer before going to bed so that the diffuser does not run all night. This is not only a waste of oil, but it is not recommended to spread for a long time.

For safety reasons and to maintain the service life of the diffuser, it must have an automatic shutdown function. When the water tank is low, it will automatically shut down to protect the diffuser from burning.


When considering an essential oil diffuser, consider the size of the room you plan to use for diffusion most often. For best results, the size of the room should be consistent with the area coverage of the diffuser. Another key metric to consider is capacity. The larger the reservoir or water tank, the longer the diffuser will run without refilling.

On the other hand, if you like to dissipate a different smell each time you use it, you might benefit from a diffuser with a smaller capacity.

Noise level

Consider the noise level associated with each type of diffuser. If you like to relax at night or at work, a quiet or whispering model may be your best choice. In most cases, ultrasonic and thermal diffusers are quiet, while atomizing diffusers tend to produce the most noise. Some fans on the evaporative diffuser have a slight soundtrack.

On the other hand, some people choose a diffuser with a little vibration and noise because it is light enough to help relax and sleep. Others prefer silence.

Frequently asked questions

  • How many drops of essential oil should you put in your diffuser?

    General guidelines around the amount of essential oils diffused suggest starting slowly until you get used to a smell and understand how your body reacts.

    The number of droplets you put into the diffuser depends on the size of the device. Diffusers under 100 ml need 3 to 5 drops, 200 ml need 6 to 10 drops, 300 ml need 9 to 12 drops, and 400 ml need 12 to 15 drops.

    If you use more than one essential oil, divide the total number of drops required for different scents. For example, a 200-ml unit might be filled with three drops of lavender essential oil and three drops of bergamot—instead of six drops per drop.

  • How to clean the essential oil diffuser

    Before scrubbing for the first time, be sure to check the cleaning plan of the diffuser to ensure its service life. Familiarize yourself with the layout of the equipment-such as the location of the reservoir drain-to avoid any electrical components from entering water. It is also important to note that although some people like to clean with vinegar, some manufacturers say that doing so will automatically invalidate the warranty on some models.

    In order to obtain the best performance and service life of the ultrasonic diffuser, please empty and dry the water tank of the diffuser after each use, and then wipe it quickly with a microfiber cloth. For deeper cleaning, use the least amount of plant-based detergent in the reservoir. Then rinse with water and let the parts air dry. Next, dip the cotton swab in rubbing alcohol and slide it on the ultrasonic chip or board to remove excess oil. Some people like to wipe the base and lid with baby wipes.

    To clean the atomizing diffuser, use a dropper to add a few milliliters of rubbing alcohol to the reservoir. Turn on the diffuser for 5 to 10 minutes. Pour out the liquid and let it air dry. If the diffuser has a quick-change top, just soak the top in rubbing alcohol for 30 minutes to an hour and let it air dry.

    For evaporative diffusers, if the mat is reusable, it is best to wash it between uses. Use a soft microfiber cloth to clean the tray with warm water and plant-based detergent. In addition, use a cloth to gently wipe the fan blades. For heating or electronic essential oil diffusers, after the device has cooled down, use the same method to clean the tray and wipe the heating plate.

  • How long should you run the essential oil diffuser?

    Generally, aromatherapists recommend using the essential oil diffuser for 30 minutes at a time. One of the dangers of using it all day long is that in some cases, the oil can cause allergic or allergic reactions.

    “I personally like to spread for about an hour at a time,” Seponara said. “Most diffusers have a timer, which makes this easy because it turns off automatically. I sometimes do this several times a day.”

  • Which essential oils can be safely spread around pets?

    For pet owners, DVM’s Tina Wismer explained that in many cases, essential oil diffusers can be used in a safe area for short periods of time. Wismer is the Senior Director of Toxicology at the ASPCA Animal Poison Control Center. “By using essential oil diffusers for inhalation, people are more concerned about respiratory tract irritation rather than exposure to specific odors,” she said.

    Avoid spreading around cats and dogs with a history of asthma or respiratory problems, and birds known to have extremely sensitive respiratory tracts. In addition, small animals such as hamsters and guinea pigs may not be able to stay away from the aroma and inhale large amounts of vapor.

    Wismer advises pet owners to “pet-proof” each designated diffusion space. If your pet has been in direct contact with essential oils and has health problems, please contact your veterinarian or call the APCC hotline (888) 426-4435.

Why trust a very good mind

Emily Stone is a journalist in Chicago who specializes in health and lifestyle content. She researches and reviews products for very good health, very good health and very good mind. As a health and wellness writer, she focuses on clean, green products and is keen to find reliable and honest brands.