Best Co2 Sensor Apps

250+ iOS apps curated and reviewed

4.0 avg rating

20 free apps

Updated October 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 October 2026.

Compare top Co2 Sensor Apps (October 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	CO2 sensor	Free	3.4★ (7)	No	No	Oct 2026
2	C02 Monitor	Free	3.0★ (2)	No	No	May 2026
3	CO2 Monitor 2	Free	—	No	No	May 2026
4	Air Quality & Pollen - AirCare	Free	4.8★ (3.3K)	Yes	Yes	Oct 2026
5	LogiCO2-Sniffer	Free	—	No	No	May 2026
6	Detector CO2	Free	2.0★ (1)	No	No	May 2026
7	Aranet Home	Free	4.8★ (627)	No	No	Oct 2026
8	LogiCO2-Scout	Free	—	No	No	May 2026

Top Picks for Co2 Sensor

#1

CO2 sensor by sighmon

Display SCD-41 CO2 readings.

Editor's Choice

3.4(7 ratings)

Free

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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

0.0(0 ratings)

Free

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More Co2 Sensor apps to explore

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

LogiCO2-Sniffer

LogiCO2-Sniffer

LogiCO2-Sniffer

by Logico2 International AB

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

by Logico2 International AB

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

My AQI Air Quality & Pollution

My AQI Air Quality & Pollution

My AQI Air Quality & Pollution

Live PM2.5, Smog Map & Widget

Check real-time air quality and pollution levels for your current location or any city worldwide. Understand the concentration of various pollutants and receive alerts for unhealthy conditions. Find protection equipment and manage respiratory health.

Real-time AQI and pollutant concentrationSearch and save global locationsWildfire and smog monitoring

free with in-app purchases

Carbostar Sense

Carbostar Sense

Carbostar Sense

Smart CO₂ Air Monitor

IndoorCO2Map Data Collector

IndoorCO2Map Data Collector

IndoorCO2Map Data Collector

by Aurel Wuensch

Contribute to a citizen science project by collecting indoor CO2 concentration data in public buildings. Use a supported CO2 sensor and this application to build a comprehensive dataset for analysis.

Collect indoor CO2 concentration dataSupports Aranet, Airvalent, AirSpot, Inkbird-IAMT1 sensorsContribute to citizen science project

OTG CO Leak Detector

OTG CO Leak Detector

OTG CO Leak Detector

Indoor Air Safety

TPI BLE For Gas Engineers

This app enables gas engineers to connect their smartphones to TPI's Smart Probes. It supports various probes for gas analysis, temperature measurement, and manometer readings, streamlining on-site data collection and interaction.

Connects to TPI Smart ProbesSupports FGA, Temperature, and Manometer probesSmartphone integration for data collection

CO2 Risk Calculator

CO2 Risk Calculator

CO2 Risk Calculator

by Logico2 International AB

A real-time air quality app.

Monitor real-time air quality including CO2, CO, temperature, and humidity remotely. Connects to specific hardware devices via Ethernet or Bluetooth to display measurements. Organize devices into groups for simultaneous monitoring.

Real-time CO2 monitoringReal-time CO monitoringReal-time temperature monitoring

📊 Productivity

SPARROW - CO & Air Quality

SPARROW - CO & Air Quality

SPARROW - CO & Air Quality

This app works with a portable carbon monoxide monitor to provide real-time air quality data and safety alerts. It displays CO levels, tracks exposure over time, and can send emergency text alerts to a designated contact.

Real-time CO level displayCustomizable warning levelsExposure tracking and graphing

💪 Health & Fitness

Proteus Sensor Cloud

Proteus Sensor Cloud

Proteus Sensor Cloud

by Avarachan Cherian

Altos: Air analyzer, CO2 Check

Altos: Air analyzer, CO2 Check

Altos: Air analyzer, CO2 Check

Wellness and Productivity App

📊 Productivity

FAQ about Co2 Sensor

What are the best co2 sensor apps for iPhone?

CO2 sensor tops our co2 sensor apps ranking as of October 2026, with a 3.4-star average from 7 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 October 2026.

How many co2 sensor apps are on the App Store?

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

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