uHoo Caeli · Smart Air Monitor
The hardware
behind everything.
uHoo Caeli is not just a device. It is the sensor that makes everything else possible. Nine parameters, professional-grade accuracy, measuring your air every minute of every day so you always have what you need to be on top of your game.
$249
Command and Guard both free for 3 months when you buy Caeli
• 9 parameters • Wi-Fi 6 • Built-in fan • 128-bit AES encryption end-to-end
• Updates every minute • 24h local storage • 1-year hardware warranty
9Air parameters
1 minUpdate frequency
Wi-Fi 6Connectivity
335gWeight
Why Caeli
Precision for those
who do not compromise.
When you are aiming to perform at your best, guesswork will not cut it. Caeli uses professional-grade sensors across nine air parameters to deliver precise, real-time readings you can actually build decisions on.
128-bit AES encryption
Every reading is encrypted end-to-end the moment it leaves the device. Your home data stays yours.
Wi-Fi 6 on both bands
Connects on 2.4 GHz and 5 GHz for faster syncs, steadier readings, and a connection that holds even in larger homes.
Built-in mini fan
Actively pulls air across the sensors instead of waiting for it to drift by, so every reading reflects your actual room, not just what floats past.
Dual-core Arm Cortex-M33
Powerful enough to sample every sensor, store data locally, and transmit it encrypted, all at once and without missing a beat.
What Caeli measures
Nine parameters.
One complete view of your air.
Every sensor inside uHoo Caeli earns its place. Each one tracks something
that changes how you breathe, recover, focus, and perform around the clock.
Sharper focus
Carbon Dioxide (CO₂)
The hidden culprit behind sluggish afternoons. CO₂ climbs fast in closed rooms, dulling focus and clarity long before the air feels stuffy.
Avoid irritation
PM2.5 Fine Particles
Microscopic particles small enough to slip into your airways from everyday cooking or outdoor drift. Caeli flags them the moment they spike.
Limit chemicals
VOCs
Fumes from everyday products, finishes, and sprays build up quietly. Real-time tracking tells you exactly when it is time to let fresh air in.
Prevent mold
Relative Humidity
Too low and your airways dry out overnight. Too high and mold starts to take hold. The healthy zone is narrow, and Caeli keeps you in it.
Sleep better
Temperature
One of the most overlooked factors in sleep quality. Even a degree or two out of range makes a measurable difference to how you rest.
Fewer headaches
Air Pressure
Barometric shifts track closely with headaches and fatigue for many people. Caeli gives you the context your weather app never will.
Block fumes
Nitrogen Dioxide (NO₂)
Released by gas stoves and heaters, it builds quickly in poorly ventilated kitchens and irritates airways at sustained levels.
Stay safe
Carbon Monoxide (CO)
Colourless and odourless, CO from faulty appliances is dangerous at any level. Caeli detects it with the accuracy that matters when it counts.
Ease irritation
Ozone (O₃)
Forms indoors when VOCs react with other pollutants. Elevated levels irritate airways even in people with no history of breathing issues.
Built for your life
Every room. Every routine.
Always on.
Setup
Plug in. Connect.
Live data in under 2 minutes.
Caeli connects to your home Wi-Fi over Bluetooth during setup, with no configuration screens and no technical know-how. Place it anywhere with a standard outlet and the uHoo app walks you through the rest. By the time you head to bed, Caeli is already calibrating to your home's baseline.
Smart home integration
Plug into the ecosystem
you already have.
No new hubs. No rewiring. Caeli is Matter-certified, so it works natively with
any Matter-compatible hub or controller and the platforms your home already runs on.
What is in the box
Everything you need
to get started.
uHoo Caeli unit
Smart air monitor with 9 sensors and a built-in active-sampling fan.
USB-C cable
Type-C power cable for a clean, universal connection.
Country-specific power adapter
5V/2A adapter matched to your region.
Quick start guide
Everything you need to get Caeli online and reading in under 10 minutes.
Want more?
Command and Guard.
The intelligence layers.
Command and Guard are optional top-ups
for when you want smart home automation or health intelligence on top of that.
Smart automation
Command
$59/year · Additional devices $29/year each
Connect Caeli to your smart home and let air quality drive it.
Your home responds before you notice the problem.
Your home responds before you notice the problem.
+Apple Home
+Alexa
+Google Home
+Samsung SmartThings
+Home Assistant
Explore Command → Free for first 3 months
Health intelligence
Guard
$79/year · Additional devices $39/year each
Four daily health indices that translate your air quality into what it means for your family's health. Know when mold conditions are building, when flu risk is high, when pollen is winning indoors.
+Mold, Virus, Influenza, Pollen indices
+Discomfort Index · heat and humidity combined
+Air Quality Index (AQI)
+Room comparison dashboard
+Hourly trends · weekly and monthly views
+Time-of-day pattern summaries
+Household profiles: kids, pets, asthma, elderly
Explore Guard → Free for first 3 months
When you buy Caeli, both Command and Guard activate immediately for 3 months.
Full comparison
Every feature, side by side.
See exactly what is included in the device, each add-on, and Stacked.
Caeli $249 · device only Command $59/yr · automation Guard $79/yr · health intelligence Stacked $99/yr · save $39
| Capabilities | Basic$0 | + Command$59 / year | + Guard$79 / year | + Stacked$99 / year |
|---|---|---|---|---|
| Live air quality dataMinute by minute | ✓ | ✓ | ✓ | ✓ |
| Instant alerts | ✓ | ✓ | ✓ | ✓ |
| Air quality charts / history | ✓ | ✓ | ✓ | ✓ |
| Share data with family / friends | ✓ | ✓ | ✓ | ✓ |
| Smart Home IntegrationApple, Google, Alexa, SmartThings, Home Assistant | - | ✓ | - | ✓ |
| Automation | - | ✓ | - | ✓ |
| Room comparison | - | - | ✓ | ✓ |
| Advanced analytics | - | - | ✓ | ✓ |
| Overlay air charts to identify correlations | - | - | ✓ | ✓ |
| Weekly and monthly views | - | - | ✓ | ✓ |
| Time-of-day patterns | - | - | ✓ | ✓ |
| Smarter alerts based on health profile | - | - | ✓ | ✓ |
| Access to web dashboard | - | - | ✓ | ✓ |
| Household profiles | - | - | ✓ | ✓ |
| Discomfort Index | - | - | ✓ | ✓ |
| Air Quality Index (AQI) | - | - | ✓ | ✓ |
| Mold Index | - | - | ✓ | ✓ |
| Virus Index | - | - | ✓ | ✓ |
| Influenza Index | - | - | ✓ | ✓ |
| Pollen Index | - | - | ✓ | ✓ |
Each additional Caeli is $249. Add-ons are priced per device: Command $59/year, Guard $79/year, or both with Stacked at $99/year per device.
Want both? · Stacked
Everything Command Does.
Everything Guard Knows.
Everything Guard Knows.
Smart home automation and health indices in one subscription.Command is $59/year. Guard is $79/year. Together as Stacked they are $99/year.You get both, you save $39, and the first 3 months are free when you buy uHoo Caeli.
$99per year · save $39
Get Stacked Technical specifications
Built for the details that matter.
| Security | 128-bit AES end-to-end encryption |
|---|---|
| Processor | Dual-core Arm Cortex-M33 |
| User interfaces | Native iOS and Android apps |
| Certifications | FCC, CE, PSE, TELEC, NTC, KC, REACH, RoHS |
| Power consumption | 750mW normal operation · 1.2W data transmission |
| Status indicator | Dual RGB LED |
| Body material | ABS thermoplastic polymer |
| Base material | Silicone rubber |
| Operating temperature | -10°C to 60°C (14°F to 140°F) |
| Operating humidity | 5% to 95% non-condensing |
| Built-in fan | Yes · active air sampling |
| Reset button | Physical button |
| Dimensions | 88mm (W) × 75mm (L) × 174mm (H) |
|---|---|
| Weight | 335g / 0.74 lbs |
| Shipping weight | 0.89 kg / 1.96 lbs |
| WiFi standard | Wi-Fi 6 802.11ax |
|---|---|
| WiFi frequency | Dual-band 2.4 GHz and 5 GHz |
| Network security | WPA3-Personal (WPA/WPA2 backward-compatible) |
| Power supply | 5V/2A USB-C cable and adapter |
| App compatibility | iOS 15 or above / Android 7.0 or above |
| Device setup | Configure via Bluetooth |
| Local storage | 24 hours during network outage |
| Smart home | Apple Home, Google Home, Alexa, SmartThings, Home Assistant |
| Parameter | Unit | Range | Resolution | Accuracy |
|---|---|---|---|---|
| Temperature | °C | -40 to 85°C | 0.1°C | ±0.5°C |
| Relative Humidity | % | 0 to 100% | 0.1% | ±3% |
| PM2.5 | µg/m³ | 0 to 1,000 | 1 µg/m³ | ±10 µg/m³ (0 to 100) · ±10% above 100 |
| TVOCs | ppb | 0 to 60,000 | 1 ppb | ±15% |
| Carbon Dioxide (CO₂) | ppm | 400 to 10,000 | 1 ppm | ±40 ppm plus 4% of actual value |
| Carbon Monoxide (CO) | ppm | 0 to 1,000 | 0.1 ppm | ±1 ppm or ±5% of reading |
| Air Pressure | mBar | 300 to 1,100 | 0.1 mBar | ±1 mBar |
| Nitrogen Dioxide (NO₂) | ppb | 0 to 1,000 | 1 ppb | ±20 ppb (0 to 100) · ±20% above 100 |
| Ozone (O₃) | ppb | 1 to 1,000 | 1 ppb | ±20 ppb (0 to 100) · ±20% above 100 |
Common questions
Things worth knowing
before you buy.
No subscription is needed to start. You get real-time readings across all 9 parameters, instant alerts, your full air quality history, and the iOS and Android app at no ongoing cost. Command and Guard are optional top-ups, and both are free for your first 3 months when you buy Caeli.
Guard and Command are optional top-ups that add intelligence layers on top of Caeli's core monitoring. Guard is the full health intelligence layer, giving you six daily indices (Mold, Virus, Influenza, Pollen, Discomfort, and AQI), hourly trend charts, weekly and monthly comparisons, date comparison, time-of-day pattern summaries, room comparison, household profiles, and a web dashboard, at $79/year. Command is the smart home automation layer, connecting Caeli to Apple Home, Google Home, Alexa, Samsung SmartThings, and Home Assistant so air quality can trigger your smart devices automatically, at $59/year. uHoo Stacked bundles both for $99/year, saving $39.
When you buy Caeli, both Command and Guard activate immediately for 3 months.
Setup happens through the uHoo app over Bluetooth. Open the app, follow the on-screen steps, and Caeli joins your Wi-Fi in seconds. It supports both 2.4 GHz and 5 GHz Wi-Fi 6 networks with WPA3 security, so it works with virtually any modern router.
Caeli uses professional-grade sensors across all nine parameters. See the full accuracy table in the Technical Specifications section above.
Caeli stores up to 24 hours of readings locally on the device during a network outage. The moment connectivity returns, everything syncs automatically to your account. Nothing is lost.
Yes. You can add Command, Guard, or Stacked any time. When you buy Caeli, both Command and Guard are active for your first 3 months, so you can decide what is worth keeping after you have used the full experience.
Yes. Additional Caeli units are $249 each, all managed from the same app, up to 10 devices per account. Add-ons are priced per device: Command $59/year, Guard $79/year, or both with Stacked at $99/year per device.
Caeli is Matter-certified and works natively with Apple Home, Google Home, Alexa, Samsung SmartThings, and Home Assistant. Viewing your air quality on any of these platforms is available on all Caeli devices. IF/THEN automations that trigger your smart devices based on air quality require Command.
Your air is talking.
Start listening.
uHoo Caeli. $249.
Command and Guard both free for your first 3 months.
1-year hardware warranty · 50+ countries
No subscription needed to start · Add top-ups any time