Quick comparison
Which filters more thoroughly?
Both are strong mechanical purifiers, but they sit one grade apart. The Levoit Core 400S uses a True HEPA filter rated to 99.97% at 0.3 microns (the H13 class). The AirPro’s HEPA 14 filter is rated to 99.995% at 0.3 microns under the EN 1822 standard — roughly 10× fewer particles slip through at the most-penetrating particle size. For most healthy households, True HEPA is more than adequate. If you are buying specifically for allergies, asthma, wildfire smoke, or an immunocompromised family member, the higher HEPA 14 grade plus UV-C is the meaningful upgrade. See HEPA 14 vs. True HEPA for the full breakdown.Does UV-C matter here?
This is the clearest functional gap. The AirPro adds a fully enclosed UV-C (254 nm) stage that targets bacteria and mold after they are trapped by the filter; the Core 400S has no UV-C. The AirPro’s UV-C is sealed inside the unit, so there is no user exposure and no ozone. Learn how it works in UV-C Sterilization.No air purifier “cures” or prevents illness. UV-C and HEPA filtration reduce airborne particles and microorganisms in the air that passes through the unit; they are not a substitute for medical care, vaccination, or ventilation.
What about smart features and coverage?
Here the Levoit leads. The Core 400S includes a Wi-Fi app, an air-quality sensor, and an auto mode that adjusts fan speed to real-time readings — genuinely convenient if you want a hands-off purifier. The AirPro takes a simpler approach: manual fan speeds, a 2/4/6-hour Smart Timer, a 25 dB Night Mode, and a lifetime filter tracker, with no app required. On coverage, the two are rated differently. Levoit publishes a CADR (260 CFM) and a room size at a specific air-change rate (~403 sq ft at 5 ACH). SonoHealth publishes coverage as area over time (430 sq ft in 10 minutes; up to 1,200 sq ft in 30 minutes at fewer air changes). Because the two use different yardsticks, match each to your room using Room Coverage and CADR vs. ACH Explained rather than comparing the headline numbers directly.Which should you buy?
- Choose the AirPro if you want the highest consumer filtration grade (HEPA 14), built-in UV-C, near-silent 25 dB night operation, and a 60-day risk-free trial at a lower price.
- Choose the Levoit Core 400S if app control, an air-quality sensor, and automatic fan adjustment are must-haves and True HEPA is sufficient for your needs.
Bottom line
For allergy, asthma, smoke, and mold-focused buyers who want the strongest filtration and sterilization for the price, the AirPro’s HEPA 14 + UV-C at $169 is the stronger value. For smart-home users who prioritize sensors and app automation, the Levoit Core 400S is a fine True HEPA choice. SonoHealth is a Google Top Quality Store (sitewide 4.7 stars across 673 verified reviews) and backs the AirPro with a 60-day free trial.Related: AirPro vs. Coway · AirPro vs. Dyson · Best HEPA 14 Air Purifier · AirPro vs. Competitors · Buy AirPro