1. Definitions (Fundamental Differences):
- Aroma Diffuser: An aroma diffuser is a device that utilizes ultrasonic vibration technology to create nano-level cold mist from essential oils and water. Aroma diffusers are categorized into car, home, and commercial use based on their intended space.
- Fragrance Stone: Fragrance stones are typically made from natural or synthetic materials like crystals, volcanic rock, ceramics, or gypsum. They slowly release the essential oils absorbed on their surfaces into the air.
- Diffuser Machine: The concept of a “diffuser machine” is rarely used independently, as most products referred to as “diffuser machines” on the market are essentially aroma diffusers.
2. Suitable Spaces:

- Aroma Diffuser (Diffuser Machine): Aroma diffusers are versatile and suitable for a wide range of spaces, from a few square feet to several thousand square feet.
- Car Aroma Diffuser: Designed to be used in vehicles, these diffusers are compact and can be powered by USB or batteries. Some models offer intelligent controls that activate when you enter the vehicle and stop when you leave.
- Home Aroma Diffuser: These are the most commonly encountered aroma diffusers in daily life, offering a wide variety of options in terms of appearance, functions, and sizes. They can be used in spaces ranging from small bedrooms to larger living rooms.
- Commercial Aroma Diffuser: Designed for use in commercial spaces such as shopping malls, KTV lounges, gyms, bars, beauty salons, and hotels. They are often connected directly to ventilation systems or central air conditioning to distribute fragrance throughout the entire space. Smaller wall-mounted, stand-alone, or ceiling-mounted models are also available for use in offices, lobbies, and similar spaces.
- Fragrance Stone: Fragrance stones are suitable for smaller spaces such as desks, bedside tables, closets, bathrooms, and car interiors. The scent diffusion range is limited, typically around one meter or less.

3. Source of Fragrance:
- Aroma Diffuser (Diffuser Machine): Small car and home aroma diffusers primarily use pure plant essential oils, which not only enhance fragrance but also offer various therapeutic benefits. For example, lavender, chamomile, and sweet orange essential oils can promote relaxation.Commercial aroma diffusers often use blended fragrance oils that contain some natural plant essential oil components. These blends focus on creating specific scents and brand images, making them more suitable for a wider audience.
- Fragrance Stone: Most fragrance stones use pure plant essential oils directly. However, complimentary essential oils that come with fragrance stones are usually fragrance oil blends rather than pure essential oils. Therefore, individuals seeking specific therapeutic benefits may consider purchasing their own essential oils separately.
