Levoit Core 400S
#2 in Medium roomsFull review
A strong all-round pick for a living room or large bedroom, with a real particle sensor and app control at a mid-range price.
Amazon $189.97$189.97
The Levoit Core 400S is the better air purifier overall, rated 3.8 to 2.9. The Levoit Core 400S leads on quiet, auto mode and value. The Levoit Core 400S costs $60.02 less ($189.97 vs $249.99).
Medify MA-40
#7 in Medium roomsFull review
A mid-to-large-room HEPA purifier with cheap filters, for living rooms where noise isn’t a concern.
Amazon $249.99$249.99
Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Levoit Core 400S for quiet (52 dB at top speed (maker rating) vs 66 dB at top speed (maker rating)), auto mode (PM2.5 laser sensor and Wi-Fi app vs no air-quality sensor or app) and value ($0.82 per cfm of smoke CADR vs $1.05 per cfm of smoke CADR).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every medium rooms air purifier; a clear win is highlighted. How we rank explains each one.
| Factor weight | Levoit Core 400S | Medify MA-40 |
|---|---|---|
| Overall rating | 3.8/5 | 2.9/5 |
| Value 25% | 75 $0.82 per cfm of smoke CADR | 58 $1.05 per cfm of smoke CADR |
| Filter cost 20% | 83 $49.99 a year in filters | 66 $80.34 a year in filters |
| Quiet 20% | 53 52 dB at top speed (maker rating) | 0 66 dB at top speed (maker rating) |
| Efficiency 15% | 48 5.8 cfm per watt | 50 efficiency not certified (neutral score used) |
| Auto mode 10% | 100 PM2.5 laser sensor and Wi-Fi app | 0 no air-quality sensor or app |
| Warranty 10% | 25 2-year warranty | 50 warranty not published (neutral score used) |
Specifications
| Levoit Core 400S | Medify MA-40 | |
|---|---|---|
| Performance | ||
| Smoke CADR | 231 cfm | 239 cfm |
| Dust CADR | 240 cfm | 231 cfm |
| Pollen CADR | 259 cfm | 240 cfm |
| PM2.5 CADR | 236 cfm | 235 cfm |
| CADR certified by | AHAM Verifide | AHAM Verifide |
| Room size (AHAM) | 358 sq ft | 370 sq ft |
| Coverage (maker) | 1,718 sq ft | 1,793 sq ft |
| Noise | 24 to 52 dB | 46 to 66 dB |
| Efficiency | ||
| Efficiency (IEF) | 5.8 cfm/W | - |
| ENERGY STAR | Yes | No |
| Energy use | 237 kWh/year | - |
| Power at top speed | 38 W | - |
| Filters | ||
| Filter | HEPA | H13 HEPA 3-in-1 (pre-filter, carbon, HEPA) |
| Activated carbon | Yes | Yes |
| Replacement | Core 400S-P 3-stage replacement filter | MA-40 replacement filter |
| Replacement cost | $49.99 every 12 months | $40.17 every 6 months |
| Yearly filter cost | $49.99/year | $80.34/year |
| Ionizer | No | - |
| CARB certified (ozone) | Yes | Yes |
| Controls and build | ||
| Air-quality sensor | PM2.5 laser | None |
| Auto mode | Yes | No |
| Wi-Fi app | Yes | No |
| Fan speeds | 4 | 3 |
| Dimensions | 20.5 x 10.8 x 10.8 in | 22 x 10.9 x 9.9 in |
| Weight | 11 lb | 15 lb |
| Warranty | 2 years | - |