AirCube - Air quality you can see

500+ AirCubes sold

$64.00 USD

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AirCube gives you a simple color signal you can read from across the room. Green means good, yellow means ventilate, red means act now.

No app. No account. No Wi-Fi. Just plug it in, and it works.

Want deeper data? AirCube pairs with Home Assistant over Zigbee for full dashboard monitoring, automations, and room-by-room tracking. Or, use it with the free Windows app.

Designed and hand-assembled in Texas.

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Donald Delaria

"Super simple set up and was easy to get into Home Assistant. I love the analytic data on my end but the colors make it an easy visual for my family. Amazing customer service, would definitely recommend!"

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.

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.

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 80K 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!

Super simple set up and was easy to get into Home Assistant. I love the analytic data on my end but the colors make it an easy visual for my family. Amazing customer service, would definitely recommend!

This is a great little device, truly. I've wanted something like this since Covid (there were a ton of fires in Colorado at the time and the air quality was so bad I got used to checking the numbers every day). Good tech assists with little to no human involvement, and this does just that. Kudos!

The air cube is a simple yet deceivingly capable bit of kit. It works out of the box and provides a passive colorful display of air quality. It is well designed and built. I have some personal experience in developing ESP devices and this is well done and very cost effective.

What especially attracted me was the ability to integrate to Home Assistant. This took a little bit of config in HA, but was well documented.

I would only offer that defining the Zigbee pairing method and link to the quirks on the product page.

Recommend.

Simple and works great! I need another one now!

I absolutely love my AirCube! It was incredibly easy to setup and get integrated with HomeAssistant. The LED AQI indicator's diffusion looks great, and it's a lovely addition to my HomeAssistant automations and a great way to see my air quality at a glance from my desk. I bought one originally to test it out and see how well it works. After setting up one I ended up buying 3 more for every room in the house. I highly recommend the AirCube!

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AirCube - Air quality you can see