CO2 sensor vs Ear Spy Apps
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CO2 sensor
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.
- Real-time CO2, temperature, and humidity readings
- Bluetooth sensor integration
- Save readings with location
- iCloud sync across devices
- Map view of saved readings
- Open source code available
Read full descriptionHide full description
Read CO2, temperature, and humidity from your Bluetooth Sensirion SCD-41 sensor in realtime. Save your readings with your current location and have it sync across your devices via iCloud. See previously saved readings with a map of the location that those readings were taken. Works across iPhone, iPad, and macOS devices. Open source code: https://github.com/sighmon/ios-ble-co2-sensor
Ear Spy Apps
Securely hide private photos, videos, and files in a password-protected vault. Capture high-quality audio with advanced recording features, including long-range directional microphones and night vision. Enhance audio clarity and customize sound with EQ adjustments for professional-grade results.
- Secure private vault
- Advanced audio recording
- Long-range directional microphone
- Night vision recording
- Password protection
- EQ adjustments
Read full descriptionHide full description
Keep important private photos, videos, and files hidden in plain sight! Adaptive Audio Recording for All Environments: ■ Capture high-quality audio with our advanced recorder. ■ Boost audio clarity for professional-grade recordings. ■ Secure your sensitive files with password protection. ■ Customize sound quality with EQ adjustments. Long-Range Directional Microphone: ■ Enhance distant sounds up to 30 feet away, focusing on voices amidst noisy backgrounds. ■ Experience unblemished audio capture, free from unwanted ambient noise. Night Vision Recording: ■ Record in low-light conditions with night vision. Private Vault for Photos, Videos, and Files: ■ Store your confidential photos, videos, and files in a secure, password-protected vault. ■ Ensure your sensitive data remains hidden from prying eyes. ■ Keep everything organized and accessible within the app. Enhanced Privacy: ■ Protect your recordings and data with password encryption. ■ Choose from multiple microphone options for precise recording. ■ Record from the iPhone bottom mic, earpiece, or earbuds. ■ Empower yourself with complete audio and visual control. Enhance your experience with Premium Features: ◆ Noise Reduction: Clear audio in any environment. ◆ Secure Vault: Protect photos, videos, and files. ◆ Dark Mode: Sleek and easy on the eyes. ◆ Powerful Recorder: Advanced recording tools. ◆ Sound Effects: Elevate your audio projects. Upgrade now to unlock these premium benefits! Choose security and control over your sensitive data. Terms of use: https://docs.google.com/document/d/1LoTUoT94Bf7MyGX1JfNs5whsNo8FdZUixn5Eu_PZlUM/edit?usp=sharing Privacy policy: https://docs.google.com/document/d/1x-TBOpV7OaSZmDfrv__aomvytUddMhcXW4vNhsXnjlA/edit?usp=sharing
Screenshots
Verdict
The clearest difference is rating: Ear Spy Apps at 4.4 against CO2 sensor's 2.7. Ear Spy Apps also leads on update cadence (every 5 weeks vs every 18 months) and ratings volume (1.2K vs 3). CO2 sensor's advantage is in-app purchases (none vs 4). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Ear Spy Apps sells 4 in-app purchases, starting at $5.99 per 7 days. CO2 sensor asks for nothing beyond the download.
Ear Spy Apps holds the better App Store score, 4.4 against 2.7. That said, the two scores are not equally well evidenced: Ear Spy Apps has 1.2K ratings behind it against 3, so its average is the more settled of the two.
CO2 sensor ships an update every 18 months, Ear Spy Apps every 5 weeks. The most recent releases landed on September 16, 2026 and September 26, 2026 respectively.
| Parameter | CO2 sensor | Ear Spy Apps |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (3 ratings) | 4.4 (1.2K ratings) — better |
| Positive reviews | — | 80.2% of reviews |
| Number of ratings | 3 | 1.2K — better |
| Update frequency | Every 18 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 0 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | sighmon | Nino Gogoladze |
Customer experience
CO2 sensor
Ear Spy Apps
Bugs and requests
CO2 sensor
Not enough reviews yet to summarise bugs or requests.
Ear Spy Apps
Reported bugs
3 issues- Can't open existing files
- No sound recording in free version
- Won't restore itself after reinstall
Requested features
3 requests- Longer free trial period
- Restore full access after reinstall
- Reduce ad frequency in free version
In-app purchases
CO2 sensor
No in-app purchases
Ear Spy Apps
- Unlimited Access - Weekly$5.997 Days
- Hearing Amplifier, SpyFall$9.991 Month
- Hearing Amplifier - Ear Spy$19.993 Months
Show 1 moreShow fewer
- Tape Recorder, SpyTec3 Days trial$34.991 Year
Questions
Is CO2 sensor free?
Is Ear Spy Apps free?
Which has better reviews, CO2 sensor or Ear Spy Apps?
Do CO2 sensor or Ear Spy Apps have ads?
Which is updated more often, CO2 sensor or Ear Spy Apps?
Other comparisons
