Blueair Blue Signature Large (SP4i) vs Levoit Core 300-P
Blueair Blue Signature Large (SP4i)
The short answer
Blueair Blue Signature Large (SP4i) comes out ahead overall with 7.8/10 against 7.1/10 for the Levoit Core 300-P. Blueair Blue Signature Large (SP4i) is stronger on noise at sleep-usable speeds, cleaning performance for bedroom size and sleep-friendly features. Levoit Core 300-P is stronger on indoor-air safety & materials, running cost & ownership and value. At current verified prices, the Levoit Core 300-P costs about $355.00 less.
- Choose the Blueair Blue Signature Large (SP4i) if: Light sleepers with a large primary bedroom who will pay for the most quiet airflow and accept an always-on ionizer.
- Choose the Levoit Core 300-P if: Budget shoppers with a small bedroom or kid's room of about 220 sq ft or less.
Scores by criterion
| Criterion | Blueair Blue Signature Large (SP4i) | Levoit Core 300-P |
|---|---|---|
| Noise at sleep-usable speeds | 9.3HouseFresh: 229 cfm at 40 dB, 34.8 dB in sleep mode. | 7.0HouseFresh: 37.1 dB in sleep mode; speed 2 is 40.5–45.7 dB. |
| Cleaning performance for bedroom size | 9.0455 smoke CADR rated; 229 cfm measured at a quiet 40 dB. | 5.5143 cfm rated; about 109 cfm PM1 at top speed (HouseFresh). |
| Sleep-friendly features | 8.3Night mode, laser PM2.5 sensor, app. | 7.3Sleep mode, display off, timer; no sensor. |
| Indoor-air safety & materials | 5.0Ionizer cannot be switched off (HouseFresh). | 7.0Ozone-free and CARB; named in the labelling settlement. |
| Running cost & ownership | 5.5About $180 a year in filters (HouseFresh). | 8.2Cheap, common filters. |
| Value | 5.8$439.99 on Amazon. | 8.8$89.99. |
Specifications
| Spec | Blueair Blue Signature Large (SP4i) | Levoit Core 300-P |
|---|---|---|
| Lowest-speed noise (manufacturer) | 23 dB | 24 dB |
| Top-speed noise (manufacturer) | 55 dB | 54.5 dB |
| Lowest-speed noise (independent measurement) | 34.8 dBA | 37.1 dBA |
| CADR (smoke where given, else headline) | 455 cfm | 143 cfm |
| Recommended room size (4.8–5 ACH / AHAM) | 705 sq ft | 222 sq ft |
| Max power draw | — | 56 W |
| Sleep / night mode | Yes | Yes |
| App control | Yes | No |
| Ionizer / electrostatic stage | Ionizer that cannot be disabled (per HouseFresh) | None (listed ozone-free) |
| Filter type | 7-stage filter incl. pelleted carbon | 3-stage: pre-filter + HEPA-type + activated carbon |
Blueair Blue Signature Large (SP4i)
Pros
- 34.8 dB in sleep mode
- About 229 cfm at 40 dB
- Large coverage
- App control and PM2.5 sensor
- Doubles as a side table
Cons
- Ionizer cannot be turned off
- Premium price
- About $180 a year in filters
- Tabletop surface scratches easily
The quietest high-airflow option for a big room, but only for buyers who accept the always-on ionizer and the cost.
Full Blueair Blue Signature Large (SP4i) review →Levoit Core 300-P
Pros
- Budget price
- 37.1 dB in sleep mode
- No ionizer
- Compact
- Low running cost
Cons
- Low airflow
- Needs higher speeds to clean a 200 sq ft room
- No app
- Named in the Vesync filter settlement
Good value for a small room, as long as you accept running it above sleep mode.
Full Levoit Core 300-P review →Both products are part of our guide The Best Quiet Air Purifiers for Bedrooms of 2026, where you can see every pick, how we score and current prices from each retailer.