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Layla vs AirGradient: full data ownership, or a monitor that does the thinking

By Nangyal Khan·11th of October, 2026·Updated 12th of October, 2026

7 min read

Layla vs AirGradient: full data ownership, or a monitor that does the thinking cover

The AirGradient ONE is the air monitor for people who want to own their data. It's open hardware and open firmware, it exposes a local API you can feed into Home Assistant or your own dashboard, and it carries strong sensors: real NDIR carbon dioxide, particulates down to PM1, a VOC and NOx index, plus temperature and humidity. The cloud dashboard is free, nothing is locked in, and your readings can stay on your own network.

Layla is built for the opposite instinct. Instead of handing you raw data to work with, it reads the air, scores it, tells you what to do, and watches the room for you. The AirGradient assumes you want to wire things up. Layla assumes you'd rather be told what the readings mean. That one difference decides most of the rest.

AirGradient earns real respect here. The openness is genuine, not a tagline: open firmware, a local API, MQTT, no lock-in, and proper Home Assistant integration. Its carbon dioxide sensing is NDIR and more precise than Layla's, and its particulate and VOC sensing are strong. For raw, precise air measurement you can own, it's hard to beat.

What the AirGradient ONE does

The ONE measures carbon dioxide with a real NDIR sensor, particulates across PM1, PM2.5 and PM10, a VOC and NOx index, plus temperature and humidity. Readings show on a small OLED with status LEDs, it connects over Wi-Fi, and it talks to Home Assistant locally, so nothing depends on the cloud. You can buy it as a self-assembly kit for around $138 or fully assembled for roughly $230. The dashboard is free, with history, alerts and reports, and no paid tier gating the basics.

Its strengths and its limits come from the same place: it's made for technical users. Getting the full value, the local API, MQTT feeds, Home Assistant automations, assumes you're comfortable setting that up, and the kit needs assembling. It's a data-rich air sensor with open plumbing, not a polished consumer appliance. Nothing flags mould conditions, recognises smoke, or senses noise or occupancy, and there's no consumer app that rolls several properties into one view. For its audience that's fine. For a non-technical buyer it's a lot of capability aimed just past them.

What Layla does

Layla detects carbon dioxide, VOCs, temperature and humidity, watches the humidity that precedes mould, and recognises the signature of smoke so it can tell vaping from cannabis from a cigarette. The difference isn't a longer sensor list. It's that Layla finishes the job.

Rather than expose a data stream for you to graph, Layla reads carbon dioxide across the day, scores how long the air sat stale, and gives you a sentence: the bedroom sealed up overnight, so leave the door open. Humidity is watched over weeks and flagged before mould takes hold. The work of knowing which numbers matter, and what to do, is already done. Our CO2 levels in your home and best air quality monitors for home 2026 guides lay out the thresholds the scoring is built on.

Layla also reaches past air in a way a single open sensor doesn't try to. It keeps a running history and pushes alerts to your phone, smoke in seconds, and on the higher tiers it adds noise scoring and radar presence sensing, with no camera or microphone, and several rooms or properties in one view. That last part matters for hosts and property managers, who want a plain app showing every unit rather than a self-hosted dashboard per device. AirGradient is a tool you operate. Layla runs on your behalf.

On its specialty, precise measurement and open data, AirGradient is the stronger device, and if that's your priority you should buy it. Layla's case is interpretation, breadth past air, and turnkey simplicity, telling you what's happening and what to do without any setup.

At a glance

	Layla (Air Quality)	AirGradient ONE
What it measures	CO2, VOC, temp, humidity, mold conditions, smoke signature ID	CO2 (NDIR), PM1/PM2.5/PM10, VOC and NOx, temp, humidity
Reads as	Plain-language scores and what to do	Raw data, local API, your dashboards
Set-up	Plug in, open the app	Kit assembly or assembled, then wire up integrations
Particulates	No	Yes, PM1 to PM10
Data model	Managed app, phone alerts	Open firmware, local API, MQTT, no lock-in
Beyond air	Noise, radar occupancy, multi-property	Air only
Subscription	None	None, dashboard free
Price	From $99 one-time	About $138 kit, $230 assembled

Which one is right for you

Buy the AirGradient ONE if you want to own your data and tinker. For Home Assistant users, researchers, and anyone who values open firmware, a local API and no lock-in, it's an excellent choice with strong, precise sensors and a free dashboard. You're giving up consumer polish and breadth for openness and control, and if that's the trade you want, it's the right monitor.

Buy Layla if you want the air understood and handled without building anything. The Air Quality tier is $99 one-time, less than an assembled AirGradient and with no subscription, and it turns carbon dioxide and VOCs into a clear air score, warns about mould early, recognises smoke, and sends alerts that reach you anywhere, straight out of the box. For homes and rentals, the higher pricing tiers add noise and presence sensing and a multi-property view, up to the $299 All-in-One, while the $99 tier covers the full air side. The detail is on the Layla air quality page. AirGradient rewards people who like wiring things up. Layla rewards people who just want answers.

Weighing the wider field? Layla vs Aranet4 and Layla vs Airthings cover the rest.

How hands-on do you want to be

If you run Home Assistant and like owning your data, the AirGradient ONE is a joy. You get precise, open readings you can graph, automate and keep on your own network, and the free dashboard really is free.

If you just want to open an app and be told the bedroom needs airing or the bathroom is trending damp, the ONE is more than you want to manage. Layla does the thinking and the watching, with smoke recognition and alerts, and nothing to wire up.

Frequently asked questions

Is Layla a good AirGradient alternative?

Yes, if you want a turnkey monitor rather than an open platform to build on. Layla scores your air, warns about mould, recognises smoke and alerts your phone, with no setup beyond plugging it in, for $99 one-time. AirGradient is the better pick if open data, a local API and tinkering are your priorities.

Which has the more accurate carbon dioxide reading?

AirGradient, on carbon dioxide alone. The ONE uses a true NDIR sensor, more precise than Layla's. Layla detects carbon dioxide accurately and builds a ventilation score and alerts on top of it.

Does AirGradient need assembly or technical setup?

The kit version needs self-assembly, and getting full value from the local API, MQTT and Home Assistant assumes some technical comfort. Layla plugs in and works through a consumer app, with no wiring.

Do either require a subscription?

No. Layla's Air Quality tier is $99 one-time, and AirGradient's cloud dashboard is free, with no paid tier for the indoor ONE.

Does Layla read particulates like AirGradient?

No. Layla focuses on carbon dioxide and VOCs, plus humidity, mould conditions and smoke. AirGradient is the stronger choice if precise particulate measurement and open data are what you're after.

Is the AirGradient ONE worth it?

For technical users who want open, accurate air data and no lock-in, absolutely, it's one of the best open monitors around. For a plug-in-and-forget home monitor that interprets the readings for you, Layla is the easier fit.

Does Layla work with Home Assistant?

Layla is a managed consumer system with its own app and alerts rather than a local-API device for Home Assistant. If deep Home Assistant integration is a must, AirGradient is built for it. If you want answers without setup, Layla is.

Do I have to assemble the AirGradient?

The kit version needs assembly, and the pricier version ships assembled. Either way you set up the integrations yourself. Layla plugs in and works through its app.