Xiaomi Smart Air Purifier 4 Compact In-Depth Review (Experts Verdict)

Our Verdict

The Xiaomi Smart Air Purifier 4 Compact is a top choice for those searching for an attractive and effective air purifier. This device’s sleek design suits any room, and it excels in larger spaces. With its smart sensor that adjusts the fan speed based on air quality and the convenient LED display showing PM2.5 levels, it’s incredibly user-friendly.

Just so you know, advanced settings require the Mi Home app, which may not be compatible with all devices. Nevertheless, this model is an excellent option if you’re looking for a stylish and innovative air purifier that can handle various pollutants. You can read our air purifier review below if you’d like to see how it stacks up against other top models.

Why Can You Trust Our Review?

At Beforebuy, our commitment to delivering trustworthy product reviews is unwavering. We understand the importance of making informed purchasing decisions and take our reviews seriously. Here’s why you can trust our detailed evaluation of the Xiaomi Smart Air Purifier 4 Compact:

• Real-time testing: We have spent over a month rigorously testing the Xiaomi Smart Air Purifier 4 Compact in various indoor environments, including living rooms, bedrooms, and offices. Throughout this period, our team carefully recorded air quality measurements before and after using the air purifier.
• Expert input: To ensure a thorough analysis, we have consulted with air purification experts, including engineers, scientists, and healthcare professionals. Their expertise has been instrumental in evaluating the air purifier’s performance, features, and safety. We have also scrutinized the product’s certifications and adherence to industry standards like HEPA, CADR, and CE.

HEPA – High-efficiency particulate air filter

• Comprehensive testing approach: Beforebuy has utilized professional equipment such as particle counters and air quality monitors to objectively measure the air purifier’s effectiveness in removing various pollutants, including dust, pollen, smoke, and VOCs.

Additionally, we have provided personal observations and feedback on factors like design, noise levels, ease of use, and smart features. This well-rounded approach ensures a thorough review, leaving no aspect unexplored.

Expert assessments

The Xiaomi Smart Air Purifier 4 Compact is a versatile air cleaner designed for small to medium-sized rooms. It strikes an outstanding balance: small yet powerful, budget-friendly yet packed with features.

Our experts were quite impressed with this air purifier. It delivers quick and efficient air cleaning with a high CADR (clean air delivery rate). Plus, it offers handy features like a timer, smart controls through the Mi Home app, and various fan speeds.

The Xiaomi Smart Air Purifier 4 Compact is a versatile air cleaner for small to medium-sized rooms.

However, there are a couple of things to consider before you buy. The filters need replacement every 6-12 months, which means ongoing costs. Some users have also reported occasional app issues despite the convenient smart features (4.1/5-star rating on Google Play and only a 3.7/5-star rating on the App Store as of now).

So, should you go for the Xiaomi Smart Air Purifier 4 Compact? It really depends on what you need.

• If you want a practical, simple air purifier that doesn’t break the bank, this one’s a great choice.
• But if you’re after more advanced features or longer-lasting filters, you might want to explore other options.

Here are the pros and cons of the Xiaomi Smart Air Purifier 4 Compact:

✔️Pros

The Xiaomi Smart Air Purifier 4 Compact stands out for several good reasons. Here are some of its key advantages:

• Effective air cleaning at a reasonable price: This device does an excellent job purifying the air, with a clean air delivery rate (CADR) similar to HEPA-based purifiers in its category.
• Straightforward setup: Getting the Xiaomi Smart Air Purifier 4 Compact up and running is a breeze, and the Mi Home app makes connecting it to your home network a piece of cake.
• Many useful in-app features: The Mi Home app offers various options and controls, including scheduling, child lock, and compatibility with other smart home gadgets.

❌Cons

While the Xiaomi Smart Air Purifier 4 Compact has several strengths, there are a few areas where it could be better. Here are some of its downsides:

• Limited onboard controls: This air purifier lacks manual controls, so you can only adjust fan speed and settings through the Mi Home app.
• No countdown timer or long-term logging: The app doesn’t offer a countdown timer or extended usage logging, which might disappoint some users.
• Proprietary filter: Instead of a HEPA filter, the Xiaomi Smart Air Purifier 4 Compact uses a specialized filter. This can lead to questions about its filtration effectiveness.

Product specifications

The Xiaomi Smart Air Purifier 4 Compact offers a range of features that contribute to its overall performance. Here are some key features:

Performance

The Xiaomi Smart Air Purifier 4 Compact efficiently cleans the air. It can clean 230 m³/h (cubic meters per hour), and for formaldehyde, it’s 76 m³/h

This little device can handle spaces up to 48 m² with two air changes every hour or 19 m² with five changes. It’s good at trapping tiny particles like PM2.5, pollen, smoke, and even microplastics – about 99.97%.

Not to mention, it deals with smells and nasty gases thanks to its activated carbon filter. The results of our test show that it’s really good at cleaning the air.

Check out this chart that helps you see how well this product performs compared to others of its kind:

3-layer filtration system

This gadget uses a three-step filter system.

• First, there’s a Primary Filter that catches big stuff like dust, hair, and junk. 
• Then, the High-Efficiency Filter, which is really good at nabbing tiny things, like those 0.3-micron particles, including PM2.5, pollen, and allergens. 
• And finally, there’s an Activated Carbon Filter, which soaks up bad smells and harmful gases like formaldehyde, benzene, and ammonia. It’s like a tag team for cleaning the air.

Three-step filter system

Connectivity and control

The Xiaomi Smart Air Purifier 4 Compact is a breeze to connect to your smartphone through Wi-Fi.

Once it’s hooked up, you can use the Mi Home/Xiaomi Home app to do lots of things. You can turn it on or off, speed up or slow down the fan, set a timer, check how much life is left in the filter, and monitor the air quality.

The Xiaomi Smart Air Purifier 4 Compact is a breeze to connect to your smartphone through Wi-Fi.

If you’ve got a smart voice gadget like Alexa or Google Assistant, you can also boss the purifier around using your voice.

In addition, there’s a handy OLED touch display on top where you can make manual adjustments and switch between automatic, sleep, or manual modes with ease.

Noise test

The Xiaomi Smart Air Purifier 4 Compact is super quiet when in sleep mode, only making 20 dB of noise, like a whisper.

In auto mode, the noise can change based on how clean the air is and how fast the fan runs.

But in manual mode, you’re the boss, and you can set the fan to be as noisy or as quiet as you want using the app or the touch screen. When it’s at its loudest, it’s about 60 dB, like regular talking or background music – not too loud.

The Xiaomi Smart Air Purifier 4 Compact is super quiet when in sleep mode, only making 20 dB of noise.

And it’s a good idea to see how noisy the Xiaomi Smart Air Purifier 4 Compact is compared to other air purifiers out there. Take a look at the chart below for the details.

Ease of use

The device is built with simplicity in mind. It has a smart OLED touchscreen that’s super easy to use, letting you tweak the settings without any fuss.

OLED touchscreen

Changing filters and doing regular upkeep is a walk in the park because of its user-friendly design. If you prefer remote control, you can use the Mi Home/Xiaomi Home app or voice commands.

Plus, there’s a nifty child lock feature to stop curious kids or pets from accidentally messing with the settings.

See our user-friendliness rating chart (rated with five stars) for the Xiaomi Smart Air Purifier 4 Compact compared to similar products.

Design

This model from Xiaomi rocks a unique cylindrical tabletop shape, unlike other Xiaomi purifiers that are more boxy. It’s all white with a clean and simple look that matches any room style.

Furthermore, it’s super lightweight at just 2.2 kg (4.9 lbs) and measures 220 mm (8.7 inches) across and 355 mm (14 inches) tall.

It’s all white with a clean and simple look that matches any room style. 

Smart features

The Xiaomi Smart Air Purifier 4 Compact has clever features that make it work better and be more user-friendly. It’s got a unique sensor that checks how much yucky stuff is in the air and shows it with a cool four-color light on top.

In auto mode, it can even speed up or slow down by itself based on how clean the air is. At bedtime, it switches to a quiet sleep mode, turns off the display light, and lets you sleep peacefully.

The app also helps you make schedules, see old data, and remind you when to change the filter. It’s all about making life easier.

Operational cost

It has a low energy consumption and high efficiency. It has a maximum output power of 27 W, which means it consumes 0.027 kWh of electricity per hour.

Assuming the average electricity price in the US is 23 cents per kWh, the operational cost of the device is 0.00621 USD/hour, or 0.14904 USD/day, or 54.3996 USD/year.

This is based on running the device for 24 hours a day at full power, which is unlikely in reality. Therefore, the actual operational cost may be lower depending on the usage and settings of the device.

Filter cost

The filter cost varies depending on the source, but it is generally around 37 USD per filter. Therefore, the annual filter cost may range from 37 USD to 75 USD, depending on how often the filter needs to be replaced.

The filter cost is generally around 37 USD per filter.

In the box

• The air purifier device
• A 3-in-1 filter (pre-installed)
• A power cord
• A user manual
• A warranty card (1 year)

Xiaomi Smart Air Purifier 4 Compact Comparison