Dewy

Dewy is marketed first as a skin and hair hydration device, jumping off the trendy idea that your skin is thirsty and what it needs is more moisture in the air. In the end, Dewy is another compact ultrasonic humidifier with a contemporary, Instagrammable design for people who want to take cool moisture with them everywhere.

Like some of our other picks, Dewy is powered by a USB cord, so you can plug it into your laptop, car or any standard USB charging brick. On its normal, continuous setting, it releases a cool, clean mist for 10 hours; change it to the intermittent setting and you’ll get a total of 20 hours of added cool moisture.

Dewy is more expensive than cool mist room humidifier options with similar specs, but you might feel better knowing that 10% of the company’s profits go to The Water Project. It has LED illumination, which provides a soft night light for use in the bedroom.

Ostad is really just a humidifier wand (like the Ourry) that comes with an accompanying cup water tank. That is to say, you don’t have to use the included cup; you can place the wand in any container. The benefit here is that the larger your water reservoir, the longer Ostad will emit a cool mist.

Including the cup, the humidifier is about 7 by 3 inches and much smaller as a wand. This makes it incredibly portable, easy to pack and a great travel humidifier. Like some of our other picks (like Dewy and Ourry), Ostad is powered by USB, so you can take it in the car, plug it into your computer or even power it with a portable battery pack.

Ostad uses a cotton wick to release cool moisture, which you’ll need to replace as often as weekly, depending on how frequently you use your humidifier. Ostad does glow blue when it’s running, so this may not be a good choice for the bedroom.

Amazon

Most water bottle-type portable humidifiers work by having a water bottle screwed into the device. Ourry is different. The humidifier, which looks like a wand, can be dropped into any container of water, including a cup or bottle. The benefit here is that the unit could mist for a pretty long time, depending on how large your water tank container is.

Another one of the pros of this design is the size. At full length, Ourry is about the size of a chubby marker, making it extremely compact. You can make it even smaller by adjusting the wand, which makes it about 5 inches tall.

Like some of our other picks, Ourry is USB-powered, so you can take the unit on the road, plug it into your laptop and even replace the included cord with another one at the length of your choosing. We especially appreciate that this little cool mist humidifier doesn’t have a bright light, which can be problematic when sleeping.

Amazon

Water bottle-based portable humidifiers are theoretically more compact since the reservoir water tank isn’t built into the device. The downside to this design is that some Amazon customers report difficulty in finding bottles that fit perfectly. Pure Enrichment doesn’t seem to have too many of these complaints, though.

Pure Enrichment is compact and aesthetically pleasing. But that doesn’t usually matter as much as the run time, which is a light 6 hours per 16.9-ounce water bottle. At $30, we expected this humidifier to have a longer misting time but included it as an option for those dedicated to finding a water bottle-based model.

The biggest concern with this portable room humidifier is its light. It can’t be turned off and reviewers have complained it’s simply too bright — especially for a bedroom.

Sonifun looks and acts a lot like Dewy, but for half the price. What you give up with that $20 difference is a slightly better design and 2 hours of continuous cool mist time. Not bad.

Sonifun uses ultrasonic technology and is powered by USB, letting you power the unit with a laptop, a USB port in a car or any USB charging brick. The ultrasonic humidifier comes with one cotton tube (which acts like a filter) — one already in the device and a replacement one in the box. A five-pack of additional filters costs $11.

Finally, you have three color options: pink, white and gray. It also includes an LED light that can display a variety of color, but — thankfully — that feature can be disabled so it won’t interrupt a good night’s sleep.