A published CADR, or a sealed HEPA claim with no CADR at all
Do you want the numbers to compare, or the design Dyson is confident enough not to publish them?
Both purifiers use HEPA filtration, and both publish real specifications — just not the same ones. Xiaomi's page is built to be compared line by line; Dyson's leaves several of those lines blank.
| Compared on | Smart Air Purifier 4 Compact | Purifier Cool PC1 |
|---|---|---|
| CADR | 230 m³/h (particulate) | Not published |
| Filtration standard | True HEPA, 99.97% at 0.3 micron | Sealed HEPA H13, 99.95% at 0.1 micron, tested to EN 1822 |
| Manufacturer room rating | up to 27 m² | up to 23 m² |
| Noise, quietest setting | 18.3 dB | Not published (only a relative "50% quieter" claim) |
| Doubles as a fan | No | Yes — Air Multiplier, over 250 L/s at maximum |
| Filter life | 6–12 months, tracked on-device | Not published |
| Control | OLED touchscreen, Xiaomi Home app, Alexa/Google | MyDyson app, voice assistant, magnetic remote |
| Price | ≈ 68 € | ≈ 399 € |
A tick marks the better answer on that line only. Counting ticks does not decide the page — the two verdicts below do, because these products answer different questions.
Take the Xiaomi if you want a purifier whose entire spec sheet can be checked and compared: a real CADR, a real sleep-mode dB figure, and a tracked filter life, at roughly a sixth of Dyson's price. It suits a bedroom or small room rather than an open living space.
Take the Dyson only if the combined fan-and-purifier function and the sealed-machine design matter more to you than having every spec on the page. It costs far more and publishes fewer of the standard comparison numbers — no CADR, no absolute noise rating, no filter life — so you are trusting Dyson's build reputation over a line-by-line spec comparison.
It isn't stated in the listings we checked across four markets. Dyson instead publishes a particle-removal percentage (99.95% at 0.1 micron, tested to EN 1822) for the sealed HEPA H13 system, which is a different kind of claim to a CADR volume figure, and the two cannot be converted into each other from the data available.
They describe different things. Xiaomi's 99.97%-at-0.3-micron figure describes the filter medium's own capture rate. Dyson's claim is that the whole machine, not just the filter cartridge, is sealed so air cannot bypass filtration — a design claim about the housing as much as the filter. Neither manufacturer publishes data that lets the two be ranked against each other directly.
230 m³/h CADR · True HEPA · up to 27 m²
A compact HEPA purifier Xiaomi rates at 230 m³/h particulate CADR and 185 m³/h formaldehyde CADR for rooms up to 27 m². An OLED touchscreen shows live air quality, sleep mode is rated at 18.3 dB, and the app tracks a 6-12 month filter life.
Best for: A bedroom or small home office where a compact footprint and a low purchase price matter more than covering a large open-plan room.
≈ 68 €
Sealed HEPA H13 · bladeless tower · fan + purifier
Dyson's Purifier Cool PC1 combines a bladeless tower fan with a fully sealed HEPA H13 filtration system the brand rates at 99.95% removal down to 0.1 micron, tested to EN 1822. Dyson does not publish a CADR figure or an absolute noise-level rating for this model.
Best for: A household that wants one device to handle both summer cooling and air purification and is willing to pay a premium for Dyson's sealed-filtration design and app ecosystem.
≈ 399 €
Prices quoted in these summaries are dated readings. The live price is shown next to each product.
