Levoit Vital 100S
#2 in Small roomsFull review
A slim smart purifier for a bedroom, especially with pets. It cleans about as much air as the Core 300 but adds auto mode and Wi-Fi.
Amazon $119.99$119.99
The Levoit Vital 100S is the better air purifier overall, rated 3.5 to 3.1. The Levoit Vital 100S leads on filter cost and auto mode. The KNKA APH2500P wins on efficiency. The KNKA APH2500P costs $30 less ($89.99 vs $119.99).
KNKA APH2500P
#8 in Small roomsFull review
A pet-oriented purifier for bedrooms up to about 185 sq ft. Its hair-catching pre-filter is the draw, but plain purifiers deliver more clean air per dollar.
Amazon $89.99$89.99
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 Vital 100S for filter cost ($52.63 a year in filters vs $119.96 a year in filters) and auto mode (particle (infrared) sensor and Wi-Fi app vs air quality (type not stated) sensor, auto mode).
- Choose the KNKA APH2500P for efficiency (5.2 cfm per watt vs 3.6 cfm per watt).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every small rooms air purifier; a clear win is highlighted. How we rank explains each one.
| Factor weight | Levoit Vital 100S | KNKA APH2500P |
|---|---|---|
| Overall rating | 3.5/5 | 3.1/5 |
| Value 25% | 77 $0.84 per cfm of smoke CADR | 83 $0.76 per cfm of smoke CADR |
| Filter cost 20% | 62 $52.63 a year in filters | 0 $119.96 a year in filters |
| Quiet 20% | 53 52 dB at top speed (maker rating) | 50 noise at top speed not published (neutral score used) |
| Efficiency 15% | 20 3.6 cfm per watt | 40 5.2 cfm per watt |
| Auto mode 10% | 100 particle (infrared) sensor and Wi-Fi app | 70 air quality (type not stated) sensor, auto mode |
| Warranty 10% | 25 2-year warranty | 25 2-year warranty |
Specifications
| Levoit Vital 100S | KNKA APH2500P | |
|---|---|---|
| Performance | ||
| Smoke CADR | 143 cfm | 119 cfm |
| Dust CADR | 161 cfm | 123 cfm |
| Pollen CADR | 173 cfm | 147 cfm |
| PM2.5 CADR | 152 cfm | 121 cfm |
| CADR certified by | AHAM Verifide | AHAM Verifide |
| Room size (AHAM) | 222 sq ft | 184 sq ft |
| Noise | 23 to 52 dB | - |
| Efficiency | ||
| Efficiency (IEF) | 3.6 cfm/W | 5.2 cfm/W |
| ENERGY STAR | No | No |
| Energy use | 244 kWh/year | 137 kWh/year |
| Power at top speed | 32 W | - |
| Filters | ||
| Filter | HEPA | HEPA-type |
| Activated carbon | Yes | Yes |
| Replacement | Vital 100S replacement filter | APH2500P filter |
| Replacement cost | $39.47 every 9 months | $29.99 every 3 months |
| Yearly filter cost | $52.63/year | $119.96/year |
| Ionizer | No | - |
| CARB certified (ozone) | Yes | Yes |
| Controls and build | ||
| Air-quality sensor | particle (infrared) | air quality (type not stated) |
| Auto mode | Yes | Yes |
| Wi-Fi app | Yes | No |
| Fan speeds | 4 | - |
| Dimensions | 16.0 x 12.6 x 6.3 in | - |
| Weight | 8.6 lb | - |
| Warranty | 2 years | 2 years |
| Released | - | 2026-09 |