Comparison

CO2 sensor vs Stud Finder Wall Detector Tool

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read 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

About

Stud Finder Wall Detector Tool

This multi-tool app helps you find studs, measure angles, and check levels with precision. It offers real-time visual, sound, and haptic alerts, along with an Apple Watch companion for convenient monitoring. Built-in tutorials guide you through its features.

Highlights
  • Magnetic stud finder with multiple presets
  • Accurate bubble level for surfaces
  • Advanced angle finder for measurements
  • Customizable sound and haptic feedback
  • Apple Watch companion app
  • Detailed visual indicators
  • Built-in tutorials and guides
Features
Read full description

# THREE TOOLS IN ONE: STUDS, LEVELS, AND ANGLES Find the studs behind a wall, check whether a surface is level, and measure or match an angle. Every reading comes with visual, sound, and haptic feedback, so you can keep the phone against the wall and still know what it found. # MAGNETIC STUD FINDER WITH FIVE PRESETS Wooden studs are held by nails and screws, and those are what the magnetometer sees. Choose the preset that matches what you are looking for — Nails in Stud, Metal Stud, Metal Pipe, Electrical Wiring, or High Precision — and the filtering adjusts to it. # ACCURATE BUBBLE LEVEL Horizontal, vertical, and surface bubbles, with the exact tilt in degrees beside them. Set the sound to any axis and you can level a shelf without watching the screen. # ANGLE FINDER WITH A LOCKED REFERENCE Measure an angle, lock it as a target, and match the second cut to the first. The dial shades the gap between the two, so how far off you are is something you see rather than calculate. # FEEDBACK YOU CHOOSE Sound and haptics are configurable per axis and per intensity. Work quietly, or set it loud enough to hear over a drill. # APPLE WATCH COMPANION Mirror the readings to your wrist. The phone stays flat against the wall while you read detection strength, bubble alignment, or the current angle on the watch. # VISUAL INDICATORS THAT SHOW THEIR WORK A strength meter and a history graph, so a peak is visible as a peak rather than as a single number that has already moved. The angle finder draws a full compass with degree markings. # TUTORIALS INCLUDED Step-by-step guides for finding studs, levelling surfaces, and measuring angles, plus how to use the Apple Watch companion. # SUBSCRIPTIONS AND AUTOMATIC RENEWAL - Your subscription includes access to all tools and the Apple Watch companion app. - Payment will be charged to your Apple ID Account at confirmation of purchase. - Subscription automatically renews unless auto-renewal is turned off at least 24 hours before the end of the current period. - Your account will be charged for renewal within 24 hours prior to the end of your selected subscription period. - Subscriptions can be managed and auto-renewal turned off in your App Store Account Settings. # LEGAL Terms of Service: https://cooptimizeit.com/terms-of-service Privacy Policy: https://cooptimizeit.com/privacy-policy # SUPPORT Contact us at info@cooptimizeit.com. We reply within 48 hours.

Screenshots

CO2 sensor4 screens
Stud Finder Wall Detector Tool4 screens

Verdict

The call

The clearest difference is rating: Stud Finder Wall Detector Tool at 4.1 against CO2 sensor's 3.4. Stud Finder Wall Detector Tool also leads on update cadence (every 9 days vs every 12 months) and ratings volume (256 vs 7). CO2 sensor's advantage is in-app purchases (none vs 13). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Stud Finder Wall Detector Tool sells 12 in-app purchases, starting at $9.99 per 7 days. CO2 sensor asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Stud Finder Wall Detector Tool holds the better App Store score, 4.1 against 3.4. That said, the two scores are not equally well evidenced: Stud Finder Wall Detector Tool has 256 ratings behind it against 7, so its average is the more settled of the two.

UpkeepUpdate frequency

CO2 sensor ships an update every 12 months, Stud Finder Wall Detector Tool every 9 days. Both last shipped on October 24, 2026.

Scorecard5 real differences · 5 level
CO2 sensor versus Stud Finder Wall Detector Tool: the parameters behind the verdict, then further details
ParameterCO2 sensorStud Finder Wall Detector Tool
PriceFreeFree
Rating3.4 (7 ratings)4.1 (256 ratings) — better
Positive reviews—6.1% of reviews
Number of ratings7256 — better
Update frequencyEvery 12 monthsEvery 9 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, Apple Watch
Requires iOS15.6 — better16.0
Further details — not scored
Size0 MB19 MB
Age rating4+4+
DevelopersighmonOptimize IT

Customer experience

CO2 sensor

All ratings7 ratings
Positive57.1%
Neutral28.6%
Negative14.3%

Stud Finder Wall Detector Tool

All ratings250 ratings
Positive76.4%
Neutral3.2%
Negative20.4%
Written reviews49 reviews
Positive6.1%
Neutral2.0%
Negative91.8%

Bugs and requests

CO2 sensor

Not enough reviews yet to summarise bugs or requests.

Stud Finder Wall Detector Tool

Reported bugs

34 issues
  • App falsely identifies studs when phone is in the air
  • Scan never starts working
  • Unable to cancel subscription
  • Charged despite attempting to cancel
  • App does not work
Show 29 more
  • App does not detect studs
  • App is unreliable
  • App is a scam
  • App is a rip off
  • App is difficult to cancel
  • App has unclear instructions
  • App steals money
  • App is a gimmick
  • App is disappointing
  • App is not useful
  • App is junk
  • App is not good
  • App is not worth it
  • App is fake
  • App is stupid
  • App is worthless
  • App is garbage
  • App is deceitful
  • App has flaws
  • App doesn't work on iPhone 16
  • App only works on metal
  • App keeps beeping continuously
  • App does not find studs
  • App is not a stud finder
  • App is a scam, no way to cancel
  • App charges without results
  • App doesn't work for wood
  • App is a scam, metal studs only
  • App claims to find wood studs but only works on metal

Requested features

6 requests
  • Improve accuracy on wood studs
  • Provide clear instructions on how to use the app
  • Offer a reliable cancellation method
  • Add support for wood studs
  • Fix the 'Start Scan' button issue
Show 1 more
  • Make the app truly free or offer a transparent pricing model

In-app purchases

None

CO2 sensor

No in-app purchases

12 purchases

Stud Finder Wall Detector Tool

Subscriptions12
  • Weekly7 Days trial2 variants$9.997 Days
  • Weekly Pro$9.997 Days
  • Weekly VIP3 Days trial$9.997 Days
Show 9 more
  • Weekly3 Days trial$12.997 Days
  • Monthly Pro$17.991 Month
  • Monthly7 Days trial$19.991 Month
  • Annual Pro$29.991 Year
  • Annual7 Days trial$29.991 Year
  • Annual VIP3 Days trial$29.991 Year
  • Annual VIP3 Days trial$49.991 Year
  • Monthly VIP3 Days trial$49.991 Month
  • Annual VIP$99.991 Year

Questions

Is CO2 sensor free?
CO2 sensor is free to download, with no in-app purchases.
Is Stud Finder Wall Detector Tool free?
Stud Finder Wall Detector Tool is free to download, with in-app purchases available.
Which has better reviews, CO2 sensor or Stud Finder Wall Detector Tool?
Stud Finder Wall Detector Tool is rated higher. CO2 sensor averages 3.4 out of 5 from 7 ratings, while Stud Finder Wall Detector Tool averages 4.1 from 256 ratings.
Do CO2 sensor or Stud Finder Wall Detector Tool have ads?
Neither CO2 sensor nor Stud Finder Wall Detector Tool shows ads.
Which is updated more often, CO2 sensor or Stud Finder Wall Detector Tool?
CO2 sensor ships an update every 12 months, and Stud Finder Wall Detector Tool every 9 days. Most recently, CO2 sensor was updated on October 24, 2026 and Stud Finder Wall Detector Tool on October 24, 2026.

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