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IQAir vs PurpleAir
IQAir sells a branded monitor plus an air-purifier line; PurpleAir is cheaper and feeds one of the most widely embedded public air quality maps.
Side by side
| IQAir | PurpleAir | |||||
|---|---|---|---|---|---|---|
| Vendor | IQAir | PurpleAir, Inc. | ||||
| Pricing model | Subscription | Free tier + paid plans | ||||
| Free tier | Yes | Yes | ||||
| Deployment | Cloud | Cloud | ||||
| Open source | No | No | ||||
| Best for | Consumers and businesses wanting a branded indoor/outdoor monitor plus access to IQAir's global air quality map. | Communities, schools and individuals wanting an affordable, real-time local air quality readout, with awareness that readings need calibration against regulatory monitors. | ||||
| Pricing | Free AirVisual app and map; monitors are one-time hardware purchases, with business data licensing sold separately.
Prices read from the vendor's own page on September 21, 2026. Vendors change prices; check the source before you budget. | Sensor map and API access are free; revenue comes from one-time hardware purchases rather than subscriptions. Pricing has not been verified yet — see the vendor's site. | ||||
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Verdict
Both are consumer-facing air-quality hardware companies whose sensor networks feed free public maps, and both make their money on one-time hardware sales rather than subscriptions. The real differences are price, positioning and what else the company sells.
IQAir's AirVisual monitors run $299.99–$329.99 for outdoor and indoor models, measuring PM2.5, PM10, CO2, temperature and humidity, and feed the free AirVisual app and IQAir's public world air quality map, which underlies its widely cited annual World Air Quality Report. IQAir also sells a full air-purifier line, so its hardware and its editorial content (the annual report) both support that broader business.
PurpleAir sensors are laser-particle-counter devices measuring PM1, PM2.5 and PM10 plus temperature and humidity, and every registered unit streams to the free public PurpleAir map — which is embedded so widely by news outlets, fire agencies and government platforms like AirNow that it functions as informal public infrastructure. PurpleAir does not sell purifiers or other adjacent products; hardware is the whole business.
Choose IQAir if
- You want one branded ecosystem covering monitoring and purification, with a single app for both.
- You value IQAir's published World Air Quality Report as a reference point alongside your own readings.
- You want an indoor monitor tracking CO2 alongside particulates, which IQAir's line includes.
Choose PurpleAir if
- You want the lower-cost option and are comfortable relying on the community map rather than a vendor's own app for context.
- You want your data to show up in fire and smoke-tracking tools and AirNow-adjacent platforms, where PurpleAir sensors are especially widely embedded.
- You do not need an air purifier from the same vendor.
The honest caveat
Both use low-cost optical sensors, and both diverge from reference-grade regulatory instruments during smoke and high-humidity events — this is a known limitation of the sensor class, not specific to either brand. The US EPA publishes a correction factor for exactly this reason, and PurpleAir applies it to align consumer readings with regulatory monitors; check whether IQAir's published figures carry the same kind of correction before treating either brand's outdoor reading as more than indicative. See OpenAQ vs PurpleAir for how a free aggregator handles the same accuracy question across many sensor sources at once.
Last reviewed September 22, 2026