Best Co2 Check Apps

250+ iOS apps curated and reviewed

4.2 avg rating

20 free apps

Updated October 2026

From beginner-friendly picks to power-user tools, our co2 check list covers 250+ iPhone apps updated through October 2026. Compare ratings, prices, and screenshots in one place.

Compare top Co2 Check Apps (October 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	Altos: Air analyzer, CO2 Check	Free	—	No	No	May 2026
2	CO2 sensor	Free	3.4★ (7)	No	No	Oct 2026
3	CO2 Risk Calculator	Free	—	No	No	May 2026
4	C02 Monitor	Free	3.0★ (2)	No	No	May 2026
5	CO2 Monitor 2	Free	—	No	No	May 2026
6	CO₂ AR	Free	—	No	No	May 2026
7	Gas Checker	Free	5.0★ (1)	No	No	May 2026
8	Scone: Your CO2 Companion	Free	5.0★ (1)	Yes	No	May 2026

Top Picks for Co2 Check

#1

Altos: Air analyzer, CO2 Check by Woodenshark LLC

Wellness and Productivity App

Editor's Choice

📊 Productivity

0.0(0 ratings)

Free

Altos: Air analyzer, CO2 Check screenshot 1

Altos: Air analyzer, CO2 Check screenshot 2

Altos: Air analyzer, CO2 Check screenshot 3

Altos: Air analyzer, CO2 Check screenshot 4

Altos: Air analyzer, CO2 Check screenshot 5

#2

CO2 sensor by sighmon

Display SCD-41 CO2 readings.

Strong Contender

3.4(7 ratings)

Free

CO2 sensor screenshot 1

CO2 sensor screenshot 2

CO2 sensor screenshot 3

CO2 sensor screenshot 4

CO2 sensor screenshot 5

CO2 sensor screenshot 6

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.

#3

CO2 Risk Calculator by Logico2 International AB

Worth Considering

0.0(0 ratings)

Free

CO2 Risk Calculator screenshot 1

More Co2 Check apps to explore

requires a wireless CO2 sensor

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.

Remote CO2 monitoringReal-time data displayCompatible with wireless sensors

📊 Productivity

Visualise CO₂ Emissions in AR

Software for Gas Engineers

Streamline your gas and heating business with digital reporting and invoicing. Automate customer reminders, create PDF reports, and integrate with accounting software. Eliminate paper forms and manage all your job documentation efficiently.

Create PDF reports (certificates, invoices, quotes)Automated customer remindersDigital job sheets

Scone: Your CO2 Companion

Scone: Your CO2 Companion

Scone: Your CO2 Companion

Energy Cost Saving community

This app helps you adopt a low-carbon, energy-efficient lifestyle with expert advice and community support. It provides practical tips and reminders to reduce your environmental impact and live more sustainably.

Expert-backed insightsPractical tips and remindersLow-carbon lifestyle guidance

Denbury CO2 Unit Converter

Denbury CO2 Unit Converter

Denbury CO2 Unit Converter

by Exxon Mobil Corporation

Denver CO2 Risk Calculator

Denver CO2 Risk Calculator

Denver CO2 Risk Calculator

by Logico2 International AB

by Logico2 International AB

CO2 Filter Calc

CO2 Filter Calc

CO2 Filter Calc

by TOMCO2 Systems Company

LogiCO2-Sniffer

LogiCO2-Sniffer

LogiCO2-Sniffer

by Logico2 International AB

Flight CO2 Calculator

Flight CO2 Calculator

Flight CO2 Calculator

Reduce your carbon footprint

Energy & CO2 calculator for iPhone

Energy & CO2 calculator for iPhone

Energy & CO2 calculator for iPhone

by iQ Media Ltd

Change climate on your phone

Bambu – Easy carbon credits

Bambu – Easy carbon credits

Bambu – Easy carbon credits

Carbon neutral lifestyle

Easily calculate and offset your carbon emissions to live a carbon-neutral lifestyle. Choose from a selection of certified nature projects to support positive environmental and social impacts.

Simple footprint calculationsAffordable carbon offsettingCarbon neutral lifestyle

Flight CO2 Calculator - Protect the Climate

Flight CO2 Calculator - Protect the Climate

Flight CO2 Calculator - Protect the Climate

by Andrea Bizzotto

Calculate the CO2 emissions generated by your flights and offset them through donations to climate protection projects. This app helps you understand your travel's environmental impact and offers a way to mitigate it.

Calculate flight CO2 emissionsOffset emissions via donationsOffline flight calculator

Infocar - OBD2 ELM Scanner

Infocar - OBD2 ELM Scanner

Infocar - OBD2 ELM Scanner

OBD2 scanner & car diagnostic

Monitor your vehicle's health and performance with this app. It offers real-time diagnostics, driving style analysis, and maintenance tracking. Connect to your car's OBD2 scanner for detailed insights and improved driving habits.

Vehicle diagnostics and fault code clearingReal-time sensor data monitoringCustomizable dashboard with HUD

free with in-app purchases

carbon footprint calculator

FAQ about Co2 Check

Are there free co2 check apps for iPhone?

Yes — 20 of the top co2 check apps we rank are free to download, including Altos: Air analyzer, CO2 Check and CO2 sensor.

Does Altos: Air analyzer, CO2 Check have ads or in-app purchases?

Altos: Air analyzer, CO2 Check has no ads and has no in-app purchases, according to its App Store listing as of October 2026.

How many co2 check apps are on the App Store?

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

Related searches

altos: air analyzer, co2 check