ULTI Aero vs Xiaomi, Philips & Levoit Air Purifiers

Comparing an air purifier in Singapore is harder than comparing the square metres printed on four product pages. Brands use different standards and air-change assumptions, so coverage claims that look similar may describe very different conditions. This guide compares the APEX+ Aero with the Xiaomi Smart Air Purifier 4 Compact, Philips PureProtect Mini 900 and Levoit Core 300S using published specifications available on 12 October 2026.

ULTI sells the APEX+ Aero. This is a specification comparison, not an independent laboratory test. Competitor specifications can change; check each linked manufacturer or Singapore distributor page before buying.

Quick comparison

Sources: ULTI product listing; Xiaomi official specifications; Philips Singapore product specifications; Levoit Singapore listing. The test pollutant and standard are not presented identically across all four pages, so the CADR numbers are not treated as perfectly like-for-like laboratory results.

What the CADR numbers say

On the published figures, Aero's 300m³/h is higher than Xiaomi Compact's 230m³/h, Philips Mini 900's 250m³/h and Levoit Core 300S's 258m³/h. Compare the current Aero price alongside each alternative before judging value. A higher headline CADR does not prove better whole-room performance by itself, because the listings do not all state the same test method, pollutant and fan setting.

CADR is a delivery rate. Filter efficiency is a separate measurement. A 99.97% filter claim describes particles captured from air that passes through the tested filter; it does not say that 99.97% of every particle in a room disappears instantly.

Why the coverage numbers look inconsistent

Coverage depends heavily on how many clean-air changes per hour a brand assumes. Levoit makes its 54m² claim easier to interpret by stating two air changes per hour. Philips cites the standard used for its maximum area. Xiaomi lists 16-27m² for the Compact. These area figures should not be copied into one league table without their assumptions.

For a simple room-volume comparison, divide CADR in m³/h by room volume in m³. A 20m² room with a 2.6m ceiling contains 52m³. Using the headline figures, the simplified results are:

• Aero: about 5.8 equivalent clean-air deliveries per hour
• Levoit Core 300S: about 5.0
• Philips Mini 900: about 4.8
• Xiaomi 4 Compact: about 4.4

These are arithmetic comparisons, not predictions of measured home performance. Leakage, furniture, open doors, purifier placement and the speed you actually tolerate change the result.

Which comparison matters during Singapore haze?

NEA's indoor-haze guide says smoke CADR is the most appropriate reference for haze particles and recommends smoke CADR of at least three times room volume in cubic metres. It also notes that open doors, windows, leakage and airflow obstruction can reduce performance.

None of the four rows should be described as haze-certified from the table alone. Aero's listing says 300m³/h CADR but does not label it smoke CADR. Xiaomi identifies particle CADR. Philips identifies particle CADR under GB/T testing. Levoit's Singapore page states CADR without presenting an AHAM smoke value in the compared specification block. Ask for the relevant test data if haze sizing is the deciding factor.

Use our haze and room-size calculator with your measured room.

Filters and odours

APEX+ Aero

Aero lists H13 True HEPA plus activated carbon. It is the only model in this comparison for which ULTI can provide direct local product support, but the current listing does not publish carbon weight, replacement-filter price or a fixed replacement interval.

Xiaomi Smart Air Purifier 4 Compact

Xiaomi lists a cylindrical high-efficiency filter system and sells a dedicated Compact replacement filter. Its smaller 22cm diameter and 35.5cm height make it the most compact unit in this group by published dimensions.

Philips PureProtect Mini 900

Philips publishes a three-layer system with pre-filter, HEPA NanoProtect and active carbon. It also names the FY0910 replacement filter and recommends replacement at up to one year depending on air quality and use.

Levoit Core 300S

Levoit lists a pre-filter, True HEPA and activated-carbon assembly, with a recommended six-to-eight-month replacement period. Treat that interval as model-specific guidance rather than a rule for every purifier.

Smart features

All four are positioned as smart or automatic purifiers, but app maturity and disclosed features differ. Aero lists Wi-Fi app control, a PM2.5 sensor, auto mode and timer. Philips publishes app control, scheduling, a PM2.5 sensor and automatic mode. Levoit publishes VeSync control, schedules, a particle sensor and automatic mode. Xiaomi's Compact supports smart features in its product family, but confirm the functions available in the Singapore version and app region before buying.

A sensor adds convenience; it is not a laboratory monitor. A PM2.5 sensor does not measure every odour, gas, allergen or carbon-dioxide level.

Bedroom noise: compare the setting you will use

Philips publishes 20.5-49.5dB(A), Xiaomi gives a maximum of 60dB(A), and Levoit Singapore gives 24-56dB. Aero specifies ≤55 dB, but the supplied specifications do not provide separate measurements for each fan speed or Sleep Mode. These disclosures use different test conditions and are not a like-for-like noise ranking. If you are a light sleeper, compare noise at the fan speed you intend to run rather than assuming the quietest mode delivers maximum CADR.

Size and placement

• Aero: supplied dimensions of 9.6 × 9.6 × 21.4 inches, approximately 24.4 × 24.4 × 54.4cm.
• Xiaomi Compact: 22cm diameter × 35.5cm height.
• Philips Mini 900: 23.8 × 24 × 36.4cm.
• Levoit Core 300S: 22 × 22 × 36cm.

Leave the inlet and outlet clear and follow the exact manual. Do not place a purifier behind a curtain, inside a cabinet or where bedding can block airflow.

Which one should you choose?

Choose APEX+ Aero if...

You want the highest headline CADR in this four-model table, app and automatic control, H13 HEPA plus carbon and support from a Singapore seller. Compare the current Aero price with the alternatives. Aero specifies 45W power and ≤55 dB noise; per-mode measurements and model-specific replacement-filter details should still be confirmed.

Choose Xiaomi 4 Compact if...

Your priority is the smallest published body in this group and you are sizing for a smaller room. Confirm Singapore app compatibility and local filter supply.

Choose Philips Mini 900 if...

You value the most detailed official specification sheet here, including test references, sound range, power, filter model and replacement guidance.

Choose Levoit Core 300S if...

You want a well-documented Singapore listing with a stated two-air-change coverage assumption, replacement guidance and a mature app ecosystem.

Our verdict

The APEX+ Aero lists 300m³/h CADR, H13 HEPA plus activated carbon, smart controls, a 45W power rating and specified noise of ≤55 dB. Compare its current price, room fit and local support with the alternatives. Per-mode power and sound measurements, replacement-filter part number and ongoing filter cost remain points to confirm before buying.

View the APEX+ Aero Smart Air Purifier, or read the Singapore air-purifier buying guide before deciding.

For a wider view, compare 31 air purifier brands available in Singapore. Our replacement-filter guide explains HEPA, carbon, compatibility and ownership cost, while the OEM air purifier guide explains what private-label manufacturing does and does not tell you.

Frequently asked questions

Is a higher CADR always better?

A higher like-for-like CADR means faster clean-air delivery in the test conditions, but noise, power, test method, room layout, filter cost and the speed used at home still matter.

Can I compare room coverage directly?

Only when the brands use the same ceiling height, air-change rate and test method. Otherwise calculate from room volume and read the footnotes.

Which model is cheapest?

Check the current Aero price and each linked competitor listing. Prices and promotions change, so this article does not publish a permanent cheapest-model ranking.

Which purifier is best for an HDB bedroom?

Measure the bedroom, then compare documented CADR, noise at the intended setting, replacement-filter cost and the physical space available. A smaller purifier may fit more easily; a larger delivery rate may allow a lower operating setting, but only model-specific data can confirm the trade-off.