Best Co2 Detector Apps

250+ iOS apps curated and reviewed

3.2 avg rating
20 free apps
Updated September 2026

Looking for free co2 detector apps? 20 of our 250+ tracked titles are free to download — no subscription, no trial. The rest are premium picks worth paying for.

Compare top Co2 Detector Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1CO2 sensorCO2 sensorFree2.7★ (3)NoNoSep 2026
2CO2 Monitor 2CO2 Monitor 2Free—NoNoMay 2026
3Tracer - Gas DetectorTracer - Gas DetectorFree5.0★ (1)NoNoSep 2026
4C02 MonitorC02 MonitorFree3.0★ (2)NoNoMay 2026
5Detector CO2Detector CO2Free2.0★ (1)NoNoMay 2026
6LogiCO2-ScoutLogiCO2-ScoutFree—NoNoMay 2026
7GP NOVA gas detectorGP NOVA gas detectorFree—NoNoMay 2026
8CO2 Risk CalculatorCO2 Risk CalculatorFree—NoNoMay 2026

Top Picks for Co2 Detector

CO2 sensor#1

CO2 sensor by sighmon

Display SCD-41 CO2 readings.
Editor's Choice
🔧 Utilities
2.7(3 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.

More Co2 Detector apps to explore

FAQ about Co2 Detector

What are the best co2 detector apps for iPhone?
CO2 sensor tops our co2 detector apps ranking as of September 2026, with a 2.7-star average from 3 App Store ratings, and it's free to download.
Yes — 20 of the top co2 detector apps we rank are free to download, including CO2 sensor and CO2 Monitor 2.
CO2 sensor has no ads and has no in-app purchases, according to its App Store listing as of September 2026.
We track 250+ co2 detector apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.