uHoo
uHoo Smart Air Monitor
$299
Released 2017
Best Air Quality Monitors · head-to-head
uHoo Smart Air Monitor vs Aranet4 Home
A sourced, side-by-side comparison. Aranet4 Home is cheaper at $189. Every spec and price links to its source.
Aranet
Aranet4 Home
$189Cheaper
Released 2019
Which is better: the uHoo Smart Air Monitor or Aranet4 Home?
On the specs we track, they're closely matched. The Aranet4 Home is the cheaper at $189.
As an Amazon Associate we earn from qualifying purchases. Prices verified at capture; live price may differ.
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | uHoo Smart Air Monitor | Aranet4 Home |
|---|---|---|
| US price | $299 | $189 |
| Brand | uHoo | Aranet |
| Released | 2017 | 2019 |
| Pm25 sensor | Yes | No |
| CO₂ sensor | Yes | Yes |
| Voc sensor | Yes | No |
| Radon sensor | No | No |
| Display screen | No screen - single RGB LED indicator | E-ink display (numeric CO2 ppm readout) |
| App connectivity | Yes | Yes |
| Power | 5 V/2 A USB plug-in (Micro-USB) | 2 AA batteries (up to 4-7 yr depending on battery type) |
| Release year | 2017 | 2019 |
Sources — uHoo Smart Air Monitor: getuhoo.com (verified 2026-06-20). Aranet4 Home: aranet.com (verified 2026-06-20).
What's the difference between the uHoo Smart Air Monitor and Aranet4 Home?
Where the two actually differ on the specs we track (4 of 7). Matching specs are omitted.
- Pm25 sensor: uHoo Smart Air Monitor true vs Aranet4 Home false
- Voc sensor: uHoo Smart Air Monitor true vs Aranet4 Home false
- Display screen: uHoo Smart Air Monitor No screen - single RGB LED indicator vs Aranet4 Home E-ink display (numeric CO2 ppm readout)
- Power: uHoo Smart Air Monitor 5 V/2 A USB plug-in (Micro-USB) vs Aranet4 Home 2 AA batteries (up to 4-7 yr depending on battery type)
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
uHoo Smart Air Monitor
Only one whitelisted tester, TechHive, published a hands-on uHoo Smart Air Monitor review; no PCMag, Tom's Guide, or Wirecutter coverage exists, and non-whitelist sources (Consumer Reports, Modern Castle, Gearbrain) were excluded. TechHive rates the nine-pollutant sensor among the best it has tested but faults a dated app, broken smart-home support, and a $399 price it calls overpriced. (1 sourced review, 1 lab-tested.)
Praised: Accurate, sensitive sensor suite that adds ozone and NO2, rare among rivals; Temperature and humidity readings matched the tester's reference weather sensors; Actionable, plain-English notifications on how to improve air quality.
Flagged: Dated, uninspired, not-user-friendly app; Broken smart-home support (advertised Alexa skill missing); Overpriced at $399.
Aranet4 Home
Only one whitelisted tester covers the Aranet4: NYT Wirecutter, which reports hands-on use over years and praises its accuracy and reliability, but flags that it only tracks CO2. In its October 2025 update Wirecutter places the Aranet4 in the 'competition' section rather than as a pick, favoring the multi-pollutant AirGradient One (which uses the same NDIR CO2 sensor plus more). No lab-measured Aranet4 figures were published; the surviving quotes come from Wirecutter's competition write-up. (1 sourced review.)
Praised: Accurate, reliable CO2 readings confirmed over years of hands-on use.
Flagged: Measures only CO2, unlike multi-pollutant rivals.