CO2 Sensor is an open-source utility for iOS and macOS that displays real-time air quality data from Bluetooth-connected Sensirion SCD-41 hardware.
The App DNA
What makes this app unique?
Users choose this app to bypass proprietary cloud-locked monitoring platforms, enabling direct data ownership and integration with external InfluxDB pipelines.
For Hardware enthusiasts and developers using Sensirion SCD-41 sensors for indoor air quality monitoring.
What does it look like?
Key features
Displays live CO2, temperature, and humidity readings from Bluetooth-connected Sensirion SCD-41 hardware.
Persists sensor readings to Core Data and synchronizes history across iOS, iPadOS, and macOS devices.
Exports saved sensor readings to external InfluxDB cloud accounts via API key and organization ID.
How much does it cost?
CO2 Sensor is distributed as a free, open-source utility with no in-app purchases or subscription tiers.
Velocity
Dormant developmentplatform expansionShow more...
Development has ceased, with no updates or feature releases in the last 320 days. The app currently sits in a zombie state, as the last release occurred well beyond the three-month threshold for active maintenance. There is no evidence of ongoing support or operational activity.
Who built it?
User Sentiment
What do users think recently?
How are ratings & reviews evolving?
Not enough recent reviews to extract reliable themes yet.
Read the full review analysisCompetition
Competitive landscape for CO2 sensor
How's the Utilities market?
CO2 Sensor maintains a niche position in the Utilities category as a free, open-source tool. With only 6 total ratings, the app lacks the scale to compete with mass-market air quality monitors, but its direct hardware integration provides a specialized utility for its target audience.
Read the market outlookThe rivals identified
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Access the full report for freeThe Analyst's Read
Key takeaways for CO2 sensor
Where is it heading?
The market for specialized, open-source hardware utilities remains stable but stagnant, as most users migrate toward integrated smart-home platforms. CO2 Sensor will likely remain a niche tool for developers, with its long-term viability tied to the stability of the underlying Bluetooth APIs.
- The 10-month development silence indicates a maintenance-only lifecycle, which limits the app's ability to respond to future iOS hardware changes.
The SWOT
- Open-source code allows for community-led auditing and security verification.
- InfluxDB integration enables direct data pipeline connectivity for advanced home automation users.
- iCloud sync provides a native data persistence layer across Apple devices without recurring costs.
- Implementing automated sensor-calibration alerts could provide value-add functionality for long-term air quality monitoring.
- Expanding documentation for InfluxDB setup could reduce the technical barrier for non-developer users.
Next best moves
Audit Bluetooth connectivity against current iOS standards because the app has not been updated in 320 days → ensure core functionality persists.
The counter-intuitive read
The app's lack of updates is a feature, not a bug…
Read the full takeSince the last report: The app's functional state remains unchanged after 320 days of inactivity, though the SWOT analysis has been updated to better articulate the risks of its maintenance-only lifecycle and potential paths for technical improvement.
Bottom line
CO2 Sensor serves as a stable, open-source bridge for specific hardware, but its lack of update activity makes it a high-risk dependency for long-term monitoring.
Unlock 3 critical frictions, 2 market threats and the analyst’s take.
Access the full report for freeFAQ
Is CO2 Sensor compatible with all air quality monitors?
Does CO2 Sensor require a subscription?
Can I export my sensor data to other platforms?
Sources
- [1] App Store, source
Report last updated