Humidifiers · Head-to-head
Blueair InvisibleMist H35i vs Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA)
Best Quiet for Small Bedrooms
Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA)
7.5/10
$169.99 at Amazon
Check price at Amazon
The short answer
Blueair InvisibleMist H35i comes out ahead overall with 7.7/10 against 7.5/10 for the Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA). Blueair InvisibleMist H35i is stronger on humidifying performance and value. Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA) is stronger on quiet & sleep-friendly. At current verified prices, the Blueair InvisibleMist H35i costs about $20.00 less.
- Choose the Blueair InvisibleMist H35i if: Bedrooms and medium rooms where the humidifier runs all winter and a low running cost matters more than reaching high humidity.
- Choose the Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA) if: Light sleepers in bedrooms under about 220 sq ft who want a dimmable, dishwasher-safe evaporative unit.
Scores by criterion
| Criterion | Blueair InvisibleMist H35i | Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA) |
|---|---|---|
| Hygiene & Ease of Cleaning | 8.2Dishwasher-safe tank (Blueair), cleaning rated 5/5 (Bob Vila), and an auto-dry button. | 8.4Dishwasher-safe tank, auto-dry, and cleaning rated 4.8/5 (Bob Vila). |
| Humidifying Performance | 7.0Plateaued near 51% RH and needed daily refills. | 6.0Rated for only 219 sq ft, with effectiveness 4.3/5 (Bob Vila). |
| Quiet & Sleep-Friendly | 6.5TechGearLab measured 49.6 dB. Sleep mode is very quiet (Bob Vila). | 8.8About 20 dB in sleep mode per Bob Vila, with a dimmable light. |
| Health, Safety & Materials | 8.0Evaporative with a BPA-free tank. UV and antimicrobial measures are manufacturer claims. | 7.8Evaporative with a separate RH sensor. The lid that doesn't screw on is a child-safety caveat. |
| Ease of Use | 8.0Top-fill, app control and auto mode. | 8.0Top-fill, app control and auto mode. |
| Value | 8.6$149.99 with the lowest measured running cost and $19.99 six-month wicks. | 6.0$169.99 for 1 gallon plus $29.99 wicks. |
Specifications
| Spec | Blueair InvisibleMist H35i | Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA) |
|---|---|---|
| Humidifier type | Evaporative (pump-fed wick) | Evaporative (wick) with water and air filters |
| Water tank material | BPA-free plastic (Blueair) | — |
| Tank capacity | 3.5 L | 3.8 L |
| Max runtime per tank (manufacturer) | 48 hours | 36 hours |
| Rated room coverage | 500 sq ft | 219 sq ft |
| Noise (manufacturer-rated or lab-measured) | 49.6 dB | 45 dB |
| Top-fill tank | Yes | Yes |
| Requires replaceable filter/cartridge | Yes | Yes |
| Built-in humidistat / auto mode | Yes | Yes |
| Built-in night light | No | Yes |
| Built-in white-noise / sound machine | No | No |
| Dishwasher-safe water-contact parts | Yes | Yes |
| Mist temperature | Cool (invisible vapor) | Cool (invisible vapor) |
| Wi-Fi app / voice control | Yes | Yes |
| White dust / mineral dispersal risk (per EPA type guidance) | Low – evaporative (EPA: not expected to disperse substantial minerals) | Low – evaporative (EPA: not expected to disperse substantial minerals) |
| Wick replacement interval / cost | Every 6 months; $19.99 (Blueair) | Replacement wick filter $29.99 (Levoit); interval not stated |
| Antimicrobial / UV measures | UV-integrated pump; antimicrobial wick (manufacturer claims) | Auto-dry fan dries wick after use |
| Warranty | 1 years | 2 years |
Blueair InvisibleMist H35i
Pros
- Lowest measured operating cost in TechGearLab's test
- Dishwasher-safe, BPA-free tank
- Top-fill design with smart controls
- Inexpensive wicks every 6 months
- Warranty extends to 3 years with registration
Cons
- Plateaued near 51% RH in lab testing
- Bob Vila's testers refilled it daily to hold about 45% RH
- 49.6 dB constant fan noise
- Blueair also sells an H35i G2, so check the model before buying
A smart, low-cost choice for a bedroom or medium room where the humidifier runs all winter. Expect modest humidity gains and audible fan noise, in exchange for easy cleaning and cheap running costs.
Full Blueair InvisibleMist H35i review →Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA)
Pros
- About 20 dB in sleep mode in Bob Vila's test
- Dishwasher-safe top-fill tank
- Dimmable light
- Auto mode with separate humidity sensor
- Auto-dry for the wick, 2-year warranty
Cons
- Pricey for a 1-gallon unit
- Covers only 219 sq ft
- Lid doesn't screw on
- Short runtime on high
The best pick for light sleepers in a small bedroom. It costs more than its capacity suggests, but it is quiet and easy to clean.
Full Levoit Sprout Evaporative Humidifier (LEH-B381S-WNA) review →Both products are part of our guide The Best Evaporative Humidifiers (No White Dust) of 2026, where you can see every pick, how we score and current prices from each retailer.