Best Co2 Sensor Apps

250+ iOS apps curated and reviewed

3.1 avg rating

20 free apps

Updated August 2026

If you already know CO2 sensor, this is the deeper bench. 250+ co2 sensor apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of August 2026.

Compare top Co2 Sensor Apps (August 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	CO2 sensor	Free	2.7★ (3)	No	No	May 2026
2	C02 Monitor	Free	3.0★ (2)	No	No	May 2026
3	CO2 Monitor 2	Free	—	No	No	May 2026
4	LogiCO2-Sniffer	Free	—	No	No	May 2026
5	Air Quality & Pollen - AirCare	Free	4.8★ (3.2K)	Yes	Yes	Sep 2026
6	Detector CO2	Free	2.0★ (1)	No	No	May 2026
7	Aranet Home	Free	4.9★ (605)	No	No	Sep 2026
8	Carbostar Sense	Free	—	No	No	Jun 2026

Top Picks for Co2 Sensor

#1

CO2 sensor by Simon Loffler

Display SCD-41 CO2 readings.

Editor's Choice

🔧 Utilities

2.7(3 ratings)

Free

CO2 sensor screenshot 1

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Monitor CO2, temperature, and humidity levels in real-time using a Bluetooth sensor. Save readings with location data and sync them across Apple devices via iCloud. View historical data on a map.

#2

C02 Monitor by ReFleX Wireless Inc.

requires a wireless CO2 sensor

Strong Contender

📊 Productivity

3.0(2 ratings)

Free

C02 Monitor screenshot 1

This application displays real-time CO2 levels from compatible wireless sensors. It provides a remote view of indoor air quality, helping users monitor their environment.

#3

CO2 Monitor 2 by himpel

Worth Considering

🌟 Lifestyle

0.0(0 ratings)

Free

CO2 Monitor 2 screenshot 1

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More Co2 Sensor apps to explore

LogiCO2-Sniffer

LogiCO2-Sniffer

LogiCO2-Sniffer

by Logico2 International AB

Air Quality & Pollen - AirCare

Air Quality & Pollen - AirCare

Air Quality & Pollen - AirCare

Air pollution, pollen and UV

Track real-time air quality, pollen levels, and UV index globally. Get detailed pollutant breakdowns, wildfire alerts, and AI-powered insights. Pro features include widgets, notifications, and extended data access.

Global AQI trackingPollen and UV forecastsWildfire hotspot detection

free with in-app purchases

by Geotap Games S.L.

Measure ambient CO2 levels using a compatible device. This utility app provides environmental data for your surroundings.

Measure CO2 levelsUtilizes device capabilitiesEnvironmental data display

Indoor air quality monitoring

Monitor indoor air quality with a unified app for various sensor devices. Track CO2, temperature, humidity, atmospheric pressure, and radiation levels. Receive smart alerts and analyze historical data with easy-to-read charts.

Real-time sensor data tracking90-day measurement historyCustomizable home screen widgets

Carbostar Sense

Carbostar Sense

Carbostar Sense

Smart CO₂ Air Monitor

Indoor Air Quality Sensor App

Monitor your indoor air quality by displaying live Carbon Dioxide (CO₂) levels and other sensor data from connected devices. The app helps you understand your environment's impact on health, well-being, and productivity, suggesting actions like increasing ventilation when levels are high.

Live CO₂ level displayMonitors multiple sensorsCustomizable sensor names

💪 Health & Fitness

Altos: Air analyzer, CO2 Check

Altos: Air analyzer, CO2 Check

Altos: Air analyzer, CO2 Check

Wellness and Productivity App

📊 Productivity

CO2 Risk Calculator

CO2 Risk Calculator

CO2 Risk Calculator

by Logico2 International AB

by Logico2 International AB

FSF Health: CO2-Sensor

FSF Health: CO2-Sensor

FSF Health: CO2-Sensor

by FREESIXTYFIVE GmbH

💪 Health & Fitness

by RATOC Systems, Inc.

Monitor environmental conditions with real-time data and historical graphs. This app visualizes temperature, humidity, and CO2 levels from a compatible Wi-Fi sensor.

Real-time data displayHistorical graph visualizationTemperature monitoring

Carbon Neutral & CO2 Meter

Carbon Neutral & CO2 Meter

Carbon Neutral & CO2 Meter

Carbon Footprint Calculator

CO2 Filter Calc

CO2 Filter Calc

CO2 Filter Calc

by TOMCO2 Systems Company

KE2 Sensor Tool

KE2 Sensor Tool

KE2 Sensor Tool

KE2 Therm Solutions

CO2 on Watch & Lockscreen

For Aranet4, Airvalent Inkbird

Monitor CO2 levels from compatible devices directly on your Apple Watch and iPhone Lock Screen. Receive smart alerts and view real-time air quality data with color-coded visuals for quick understanding.

Apple Watch complications with history graphiPhone Lock Screen widgetsCustomizable CO2 threshold alerts

free with in-app purchases

by KEUCO GmbH & Co. KG

BinMaster Sensor App

BinMaster Sensor App

BinMaster Sensor App

by Garner Industries

FAQ about Co2 Sensor

What are the best co2 sensor apps for iPhone?

CO2 sensor tops our co2 sensor apps ranking as of August 2026, with a 2.7-star average from 3 App Store ratings, and it's free to download.

Are there free co2 sensor apps for iPhone?

Yes — 20 of the top co2 sensor apps we rank are free to download, including CO2 sensor and C02 Monitor.

Does CO2 sensor have ads or in-app purchases?

CO2 sensor has no ads and has no in-app purchases, according to its App Store listing as of August 2026.

How many co2 sensor apps are on the App Store?

We track 250+ co2 sensor apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.

What devices does CO2 sensor work on?

CO2 sensor is compatible with Mac, iPhone, iPad, and iPod devices. It utilizes iCloud sync, making it convenient for users with multiple Apple products.

How often is CO2 sensor updated?

The latest version of CO2 sensor is 1.3, last updated on September 29, 2025. While specific update frequency isn't detailed, the app has seen regular updates since its release in 2022.

Related searches

fsf health: co2-sensor