Last updated: June 2026 · Written by Mohamed, founder of Aeris Technology, Montreal
Quick answer: Both the Aeris View and the Aranet4 HOME are portable, battery-powered CO₂ monitors built around NDIR sensing — the technology that actually measures carbon dioxide instead of estimating it. The Aeris View costs $179 CAD, shows live readings and a built-in trend chart on a large always-on display, measures every 5 minutes, works completely without an app, and is designed and assembled in Montreal. The Aranet4 HOME typically sells for US$189–249 (usually CA$260 or more once you buy it in Canada), runs for years on two AA batteries, adds an atmospheric pressure sensor, and pairs with a polished app that stores up to 90 days of history. If you want set-and-forget battery life and don't mind opening an app to see trends, the Aranet4 earns its reputation. If you want to see your air — current numbers and the last few hours — at a glance with no phone involved, pay less, and buy Canadian, that is exactly what the Aeris View was built for.
First, full disclosure
I make the Aeris View. I'm the engineer who designed it, and I sell it on this site. So treat this comparison the way you'd treat any founder comparing their product to the category leader — with healthy skepticism — and let me earn your trust by being specific about where the Aranet4 beats my device. Because it does, in a few areas that matter. The Aranet4 is a genuinely excellent monitor; it's the device that made portable CO₂ monitoring mainstream. This page exists because people ask me how the two compare, and the honest answer is more useful than a sales pitch.
Spec-by-spec comparison
| Aeris View | Aranet4 HOME | |
|---|---|---|
| Price | $179 CAD | US$189–249 (typically CA$260+ in Canada) |
| CO₂ sensor | NDIR (high accuracy) | NDIR (high accuracy) |
| Also measures | Temperature, humidity | Temperature, humidity, atmospheric pressure |
| Display | Large always-on display with live readings and a built-in trend chart | 2.4" e-ink display showing current readings |
| History without a phone | Yes — trend chart directly on the device | No — history lives in the app (up to 90 days, exportable) |
| Default measurement interval | Every 5 minutes | Every 10 minutes (configurable) |
| App required? | No — fully standalone, optional Bluetooth sync | No for current readings; yes for graphs and history |
| Battery life | Up to ~8 months on standard AAA batteries (5-min interval) | Up to 2–4 years on 2× AA (10-min interval; longer with lithium cells) |
| Calibration | Manual fresh-air calibration supported | Factory calibrated; annual manual fresh-air calibration recommended |
| Made in | Designed & assembled in Montreal, Canada | Latvia (SAF Tehnika) |
| Support | Direct from the founder, typically under 24 hours | Manufacturer / retailer support |
Where the Aranet4 wins
Battery life is its superpower. Years on two AA batteries versus months on AAAs is a real, honest gap, and the e-ink display is the reason. If "never think about batteries" is your top priority, the Aranet4 wins this one outright.
It measures atmospheric pressure. Most people never use this, but if you specifically want pressure data, the Aeris View doesn't measure it.
It has an optional audible buzzer. The Aranet4 can beep when CO₂ crosses a threshold, which some people rely on in classrooms or clinics.
It has a decade of track record. The Aranet4 was the device researchers, teachers, and clean-air advocates carried everywhere during the pandemic. That trust was earned, and its app's 90-day exportable history is genuinely well done.
Where the Aeris View wins
Price — especially in Canada. At $179 CAD, the Aeris View costs meaningfully less than what Canadians typically pay for an Aranet4 after exchange rates and retail markups. No import surprises, no currency math.
You see trends without touching your phone. This is the core design difference. The Aranet4's e-ink screen shows you now; to see what happened overnight or during your workday, you open the app. The Aeris View draws the chart right on the device. Walk past it, glance, and you know whether your bedroom CO₂ climbed overnight.
It samples twice as often by default. A 5-minute interval catches CO₂ buildup — a meeting filling up, a bedroom door closing — faster than a 10-minute one.
It's truly standalone. No app, no account, no pairing, ever required. That makes it a monitor you can hand to a parent or grandparent, put in a classroom, or use without sending data anywhere.
It's Canadian, and you talk to the person who built it. Every unit is assembled in Montreal, and support emails come to me — the engineer — usually within a day. If something's wrong, I make it right with a replacement, help, or a refund.
What they have in common
Both use real NDIR CO₂ sensing rather than the cheap estimation chips found in many low-cost monitors. Both run on standard batteries with no cables. Both are portable enough to test your bedroom tonight, your office tomorrow, and your car this winter. And both will tell you the single most useful thing about your indoor air: whether the room you're in needs ventilation right now.
Which one should you buy?
Buy the Aranet4 if multi-year battery life is non-negotiable, you want atmospheric pressure data or an audible alarm, or you want long-term exportable datasets through its app.
Buy the Aeris View if you want to see live readings and trends at a glance without a phone, you'd rather spend $179 CAD than $260+, you value a device with zero setup that anyone in the household can read, or you want to support Canadian hardware with founder-direct support.
Frequently asked questions
Is the Aeris View as accurate as the Aranet4?
Both devices are built around NDIR CO₂ sensing — the same measurement technology, and the reason both can be trusted over low-cost monitors that merely estimate CO₂ from other gases. We've published our own accuracy testing in this deep-dive.
Why are these monitors more expensive than $40 CO₂ monitors on Amazon?
Most very cheap "CO₂ monitors" use eCO₂ estimation chips that infer CO₂ from volatile compounds — readings can be wildly wrong. NDIR sensors shine infrared light through an air sample and measure actual CO₂ absorption. That sensor is most of the cost in both the Aeris View and the Aranet4.
Can I buy the Aeris View outside Canada?
Yes — we ship internationally from Montreal. See the product page for details.
Related reading: What is a safe CO₂ level indoors? · The 2026 buyer's guide to air quality monitors
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