AirCube - Air quality you can see

$64.00 USD

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You can't see what you're breathing. Paint fumes, cooking VOCs, off-gassing furniture, stale bedroom air. Indoor air can be 2 to 5 times more polluted than outdoor air.

AirCube glows green, yellow, or red so you can see your room's air quality from across the room. Green means good. Yellow means ventilate. Red means act now.

Pair it with Home Assistant over Zigbee or use the free Windows app to track VOCs, AQI, temperature, and humidity room by room. No app necessary, no account, no cloud.

Use one on your desk, or place a few around your home to see how air quality changes from room to room.

✔ 1000+ sold
✔ Designed and hand-assembled in Texas.
✔ 30-day satisfaction guarantee.

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2-Pack: Save 10%
4-Pack: Save 20%
Free shipping on orders $99+

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Here is how it works

Ships from Texas. 30-day satisfaction guarantee.

If you are not thrilled with your AirCube, email contact@stuckatprototype.com
and return it within 30 days of delivery for a full refund. No questions asked.

Know when your air needs attention

Most air quality monitors bury you in numbers. AirCube does the opposite.

Green means air looks good.
Yellow means it may be time to ventilate.
Red means your air needs attention.

Put it on your desk, shelf, nightstand, or workbench and check your air at a glance, no dashboard required.

Use it your way

Standalone: Just plug it in. No app, no account, and no Wi-Fi required. AirCube gives you a simple color signal you can read at a glance.

Home Assistant: Pair it over Zigbee to monitor VOC, air quality index, temperature, humidity, and eCO2 on your dashboard. Build automations, track trends, and compare air quality from room to room.

Windows app: Use the free Windows app to view live readings and historical graphs. No subscription required.

Open-source. No cloud. No data collection.

Your data stays yours.

Ready to see what your room is doing?

Add AirCube to your desk, bedroom, or a workshop. See your air at a glance.

Buy now

Made for the rooms that matter most

AirCube helps you notice air quality changes in the places where you actually live and work.

Use it in your office, bedroom, workshop, kitchen, or near a 3D printer to catch changes you would otherwise miss.

When the color changes, you know it is time to open a window, turn on a fan, or pay attention to what is affecting the room.

More things affect your air than you think

Cooking. Cleaning sprays. Candles. Soldering. 3D printing. Fresh paint. Adhesives. Even spending hours in a closed room.

Most of these changes are invisible, but they still affect the air around you.

AirCube makes those changes visible, so you can spot patterns, compare rooms, and respond before the room starts to feel stale.

Technical specifications (if you want them)

Feature	Details
Sensors	ENS161 (VOC/CO₂eq), ENS210 (Temperature, Humidity)
Microcontroller	ESP32-H2
LED	IN-PI15TAT5R5G5B Addressable RGB
Power	USB-C (5V)
Dimensions	49 mm × 49 mm × 36 mm
Firmware	Open source (available on GitHub)
Enclosure	3D-printed PLA with diffused top
Connectivity	USB-C for data and power + native ESP32H2 protocols
Home Assistant	ZHA and Zigbee2MQTT supported

Frequently Asked Questions

Does it really work right out of the box?

Yes. Plug AirCube into any USB-C port or adapter. Within seconds the LED responds to your air. No app to download, no account to create, no Wi-Fi to configure, no hub to buy. Most air quality monitors take multiple attempts to set up. AirCube skips all of that.

Do I need Home Assistant to use AirCube?

No. AirCube works great on its own as a simple color-based air monitor. Home Assistant is optional.

How accurate is it?

AirCube uses the ENS161 and ENS210 — reliable, well-documented sensors designed for indoor air quality monitoring.

What does the color actually mean?

Green means your air quality is in a normal range. Yellow means VOC levels are elevated. Consider opening a window or turning on a fan. Red means your air needs immediate attention. Ventilate the space. You don't need to interpret a number or look anything up. The color is the answer.

Can I turn off the light?

Yes, You can adjust the light to different brightness levels by clicking the button on the back or you can adjust it via Home Assistant. *Note that the button can only be pressed with a pen or another pointy tool at the moment.

Is it really open sourced?

Yes! You can find all the schematics, code and mechanical files here: https://github.com/StuckAtPrototype/AirCube

What can cause the color to change?

More than you'd expect. Cooking fumes, cleaning products, candles, 3D printing, soldering, fresh paint, adhesives, new furniture off-gassing, even just breathing in a closed room for a few hours. AirCube makes those invisible shifts visible.

Does it need Wi-Fi or a phone?

No. AirCube works completely offline. There is no cloud, no app, and no data leaves the device. If you want deeper data, you can connect it to Home Assistant over Zigbee or view live readings on a PC with the free Windows app. Neither is required.

Where should I put it?

Wherever you spend the most time. Your desk, bedroom nightstand, kitchen counter, or workshop bench. Most customers start with one and add more. The popular setup is bedroom + office + workshop

What's it made of? Where does it come from?

Every AirCube is designed and hand-assembled by me (Damian) and my wife (Marcela) in my workshop in Leander, Texas. The enclosure is 3D-printed PLA, the firmware is open source, and when you email support, you're talking directly to the person who built your unit.

What if I don't like it?

Email me at contact@stuckatprototype.com, and I will send you a return label. Return it within 30 days for a full refund. No questions asked.

Hi! I'm Damian

I design, build, and ship every AirCube from my workshop in Texas.

On top of that, I run a YouTube channel with roughly 90K subscribers called "StuckAtPrototype". You can check it out at the link below.

https://www.youtube.com/@stuckatprototype

Thanks for your support. I will make sure to do everything in my power to make your experience as seamless as possible. Also, feel free to reach out to me at contact@stuckatprototype.com if you have any questions!

Null

Very easy to use and understand the read out. I could tell very quickly that the air in my bathroom is poor quality. The openness of this project is spurring me towards getting hooked up with the home assistant ecosystem.

When this precious little AirCube first arrived, I just plugged it into the wall and it started working instantly! No fuss, no bother, and no needing a degree in engineering just to get it going. It is absolute proof that good things come in small packages, speaking my language plain as day just by changing color to show me exactly what's in the air. When I’m frying up some green tomatoes and the kitchen gets a touch smoky, it turns bright red to let me know it's time to get a cross-breeze going. It even plays nice with that fancy "Home Assistant" system I use to run the gadgets around the house, sending all that air quality information right to it without a single hiccup. It stays as quiet as a church mouse, just sitting there like a tiny guardian angel making the invisible plain as day so I know exactly when to open up the windows and let that sweet breeze in.

The only tiny notion is that the little light can be a touch bright in the evening when I’m trying to settle down with my sweet tea and watch my programs, but it’s no trouble at all to just turn it facing the wall a bit. If you want a sweet little helper that lets you see exactly what you're breathing without having to squint at tiny numbers or fiddle with a smartphone, you go on ahead and get yourself one. It connects up to your smart home beautifully, is worth every single penny for the peace of mind, and gets a whole five stars from me!

Since decommissioning the Molekule air filter (which also measured air quality), this worked well! Its light is visible from farther away than the Molekule's light without being overly bright.

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AirCube - Air quality you can see