Xiaomi Smart Air Purifier 4 Compact at a glance
In short: the Xiaomi Smart Air Purifier 4 Compact scores 7,9/10 in our air purifier review (from €85). Biggest strength: live PM2.5 on the unit. Main compromise: turbo clearly audible.
All specifications come from manufacturer data sheets and the Amazon catalogue and were cross-checked before publication. The rating is an editorial overall assessment based on this data; we do not trial products ourselves.
Xiaomi Smart Air Purifier 4 Compact: what works, what doesn't?
What works well
- Live PM2.5 on the device: the OLED touch display shows air quality in real time, no need to look at the app
- Auto mode + app: regulates by sensor; schedules, Alexa and Google via Mi Home
- Cheapest smart purifier: under €90 with sensor and automatic mode, which nobody else in the comparison offers
- Cheap replacement filters: approx. €20 per filter, the lowest filter prices in the field
- Compact & light: Ø 22 cm, 2.2 kg, sits unobtrusively next to the bed or sofa
Points of criticism
- Turbo clearly audible: up to approx. 60 dB at the highest setting, so use sleep mode at night
- Only up to 27 m²: for larger open-plan kitchen-living rooms the Levoit Vital 100S is the better choice
Specifications in detail
| Type | Compact air purifier (smart) |
| CADR | 230 m³/h (particles) |
| Room size | 16 to 27 m² |
| Noise level | approx. 20 to 60 dB (sleep mode ~20 dB) |
| Power | 27 W |
| Filter | 3-in-1: pre-filter + particle filter (99.97 % down to 0.1 µm) + activated carbon |
| Filter change | every 6 to 12 months · replacement filter approx. €20 |
| Sensor | PM2.5 sensor with live OLED display + auto mode |
| Smart | Mi Home app, Alexa, Google Assistant, ion function |
| Dimensions / weight | Ø 22 × 35.5 cm · 2.2 kg |
What does it cost to run?
At a maximum of 27 W power draw, one hour of operation at 35 ct/kWh (German electricity price) costs about 1 cent. Eight hours of continuous running (for example overnight) therefore cost about 8 cents.
Calculation basis: 35 ct/kWh (German electricity price, 2026, rounded). Values from the manufacturer data sheet; actual costs depend on use and tariff.
Build quality & everyday use
What carries the Xiaomi Smart Air Purifier 4 Compact in everyday use: live PM2.5 on the unit (OLED touch display shows air quality in real time, no need to check the app) and auto mode + app (regulates by sensor; schedules, Alexa and Google via Mi Home). We have to be honest about the weaknesses: turbo clearly audible, up to about 60 dB on the highest level, use sleep mode at night.
If you set the device up to save space, make sure it stands on a stable, level surface with some air around it. This protects the mechanics and electronics in continuous use.
Who is the Xiaomi Smart Air Purifier 4 Compact suited to? (buying advice)
Perfect for:
- ✓Price-conscious smart home fans
- ✓Bedrooms & rooms of 16 to 27 m²
- ✓Mi Home / Xiaomi users
Less suitable for:
- ✕App sceptics (account required for extras)
- ✕Large open-plan kitchen-living rooms over 27 m²
- ✕Anyone who wants maximum filter area
Xiaomi Smart Air Purifier 4 Compact compared with alternatives
Head-to-head with the top alternatives from our air purifiers comparison
| Feature | Xiaomi Smart Air Purifier 4 Compact | Levoit Core 300S | Philips 600 Series (AC0650/10) |
|---|---|---|---|
| CADR | 230 m³/h | 240 m³/h | 170 m³/h |
| Room size | 16 to 27 m² | up to 50 m² | up to 44 m² |
| Noise level | ~20 to 60 dB | 22 to 50 dB | 19 to 49 dB |
| Filter | 3-in-1 + sensor | HEPA + activated carbon | NanoProtect HEPA |
| Power | 27 W | 23 W | 12 W |
Similar air purifier models
Frequently asked questions about the Xiaomi Smart Air Purifier 4 Compact
Is the Xiaomi Smart Air Purifier 4 Compact any good?
How loud is the Xiaomi 4 Compact at night?
What do the replacement filters for the Xiaomi 4 Compact cost?
Do you need the app for the Xiaomi air purifier?
Verdict: is the Xiaomi Smart Air Purifier 4 Compact worth it?
A solid option with a clear profile: if you can live with turbo being clearly audible, from €85 you get mainly one thing: live PM2.5 on the unit. It suits best: price-conscious smart home fans.
If you want to compare alternatives, you will find detailed data and reviews on our air purifiers comparison page.
Buy now at the best price (UK) Buy now at the best price (US)