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Best Co2 Level Monitor Apps

215+ iOS apps curated and reviewed

4.4 avg rating
19 free apps
Updated June 2026

If you already know Level Tool · Angle Finder, this is the deeper bench. 215+ co2 level monitor apps for iPhone, all reviewed and ranked by user rating, recency, and download trend as of June 2026.

Top Picks for Co2 Level Monitor

Level Tool · Angle Finder#1

Level Tool · Angle Finder by Shenzhen AiPuLeSi Technology Co.,Ltd

The best level tool for you
Editor's Choice
🔧 Utilities
4.5(230 ratings)
FreeIn-App Purchases
Level Tool · Angle Finder screenshot 1
Level Tool · Angle Finder screenshot 2
Level Tool · Angle Finder screenshot 3
Level Tool · Angle Finder screenshot 4
Level Tool · Angle Finder screenshot 5
Level Tool · Angle Finder screenshot 6

This digital spirit level tool helps you measure angles and check if surfaces are perfectly level, ideal for DIY projects, construction, and carpentry. With various modes, including a laser level, angle finder, and inclinometer, you can get precise readings and sound alerts, making it a must-have tool for professionals and enthusiasts alike.

i-Heart: Heart Rate Monitor#2

i-Heart: Heart Rate Monitor by Shenzhen Manlang Technology Co., Ltd.

blood pressure & pulse Tracker
Strong Contender
💪 Health & Fitness
4.6😞(5.1K ratings)
FreeAdsIn-App Purchases
i-Heart: Heart Rate Monitor screenshot 1
i-Heart: Heart Rate Monitor screenshot 2
i-Heart: Heart Rate Monitor screenshot 3
i-Heart: Heart Rate Monitor screenshot 4
i-Heart: Heart Rate Monitor screenshot 5

Vitarate is a comprehensive heart health tracker app that helps you monitor your blood pressure, pulse, and overall cardiovascular well-being. With personalized data analysis, visualization tools, and daily health recommendations, Vitarate empowers you to take an active role in managing your heart health and achieving optimal wellness.

What We Love

  • 👍 Easy to use
  • 💡 Innovative features

Room to Improve

  • 🐛 Doesn't work as advertised
  • 💰 Overpriced
  • 🚫 False advertising
System Status: hw monitor#3

System Status: hw monitor by Techet

CPU,battery,disk usage info
Worth Considering
🔧 Utilities
4.6😊(2.4K ratings)
FreeAds
System Status: hw monitor screenshot 1
System Status: hw monitor screenshot 2
System Status: hw monitor screenshot 3
System Status: hw monitor screenshot 4

System Status provides essential system monitoring for your iPhone and iPad, including CPU load, battery level, disk usage, and network connections. Monitor your device's performance in real time with this handy tool.

What We Love

  • 👍 Easy to use
  • 🚀 Provides quick system status overview
  • 🔋 Helpful for monitoring battery and charging
  • 💡 Useful for troubleshooting device issues

Room to Improve

  • 🐛 Occasional bugs or crashes reported
  • 🔒 Some privacy concerns with ad-supported version
  • 💰 Desire for more features in free version

More Co2 Level Monitor apps to explore

4
Decibel X:dB Sound Level Meter
Decibel X:dB Sound Level Meter
Decibel X:dB Sound Level Meter
Frequency Spectrum Analyzer
Free

Transform your iOS device into a professional sound level meter with pre-calibrated accuracy and various frequency spectrum analysis tools. Measure sound pressure levels, export data to Health app, and enjoy features like FFT graphs, dosimeter readings, and InstaDecibel for social sharing. Experience the convenience of tracking noise levels with precision and ease.

🔧 Utilities
(156K)
5
Battery Level
Battery Level
Battery Level
Percentage Indicator & Monitor
Free

Battery Level is a handy app that displays your device's battery percentage with a simple and intuitive interface. Stay informed about your battery status at a glance. Download now for quick access to your battery information.

🔧 Utilities
(927)
6
HeartFit - BP Health Tracker
HeartFit - BP Health Tracker
HeartFit - BP Health Tracker
Pulse Monitor & Self-Care Mate
Free

A comprehensive health tracking app designed to monitor and manage blood pressure levels, heart rate, and overall cardiovascular health. Stay on top of your well-being with personalized insights and tracking features. Download now to take control of your heart health.

💪 Health & Fitness
(1.7K)
7
Bubble Level 2022
Bubble Level 2022
Bubble Level 2022
Level in the palm of your hand
Free

Turn your smartphone into a versatile bubble level with multiple viewing options for precise calibration. From angle and slope measurements to sound effects and orientation locking, this app supports various types of spirit levels for different applications. Transform your device into a handy tool for leveling tasks with ease and accuracy.

🔧 Utilities
(6.1K)
8
Decibel X PRO: dBA Noise Meter
Decibel X PRO: dBA Noise Meter
Decibel X PRO: dBA Noise Meter
Frequency Spectrum Analyzer
$69.99

Transform your iOS device into a professional sound level meter with our leading noise meter app. Measure sound pressure levels accurately and protect your hearing, whether you're an audio expert or simply curious about your surroundings. See noise levels on your Apple Watch, export data to the Health app, and enjoy features like frequency analysis and dosimeter readings.

🔧 Utilities
(6.9K)
9
Nee-Vo
Nee-Vo
Nee-Vo
by Reseau sans fil Otodata Inc
Free

Track tank levels accurately in real-time, view usage history, receive customizable alerts, and easily request service with the Nee-Vo app. Manage multiple tanks and share data with up to 3 users. Get started by installing the Otodata telemetry unit and activating your account with the provided code.

🔧 Utilities
(7.3K)
10
Bubble Level Tool - Digital
Bubble Level Tool - Digital
Bubble Level Tool - Digital
Angle finder & leveller
Free

A digital bubble level tool that helps users find angles accurately for various tasks. Download now to easily measure levels and angles with precision.

🔧 Utilities
(2.2K)
11
Bubble Level Plus+
Bubble Level Plus+
Bubble Level Plus+
+ Angle Meter & Tilt Meter
Free

Bubble Level Plus is a handy tool that functions as an angle meter for precise measurements. Ensure accuracy in leveling with this intuitive application.

🔧 Utilities
(15K)
12
Bubble Level: AR, Angle Finder
Bubble Level: AR, Angle Finder
Bubble Level: AR, Angle Finder
Inclinometer & Ruler Measure
Free

Transform your phone into a highly accurate bubble level and measurement tool with ease. Ideal for DIY enthusiasts and professionals, this app offers versatile measurement tools, augmented reality features, and simple calibration for precise results. Download now to elevate your projects with unparalleled precision!

🔧 Utilities
(667)
13
C02 Monitor
C02 Monitor
C02 Monitor
requires a wireless CO2 sensor
Free

Monitor your indoor air quality by displaying real-time CO2 levels from a compatible wireless sensor. Get essential environmental insights at a glance.

📊 Productivity
(2)
14
SPARROW - CO & Air Quality
SPARROW - CO & Air Quality
SPARROW - CO & Air Quality
Eco Sensors
Free

This portable air quality monitor provides high-level safety alerts and low-level warnings for carbon monoxide and air pollution, helping users protect their health and safety. With a companion app, users can track and graph CO levels, map events, and even send emergency texts to designated contacts when high levels are detected.

💪 Health & Fitness
(7)
15
HD Level ⊜
HD Level ⊜
HD Level ⊜
Precision bubble level
Free

This precision bubble level app brings traditional leveling tools into the modern age, offering accurate measurements and simplicity in one sleek design, making it easy to straighten picture frames, shelves, and other hanging items. Download it today and take the guesswork out of your measurements with a tool that's always ready at your fingertips.

🔧 Utilities
(266)
16
Device Monitor²
Device Monitor²
Device Monitor²
System activity info
Free

Discover vital system activity info with this app optimized for Apple devices, offering detailed insights into sensors, RAM, storage, CPU, network, battery, display, and more. Customize widgets and enjoy additional features with in-app purchases for an enhanced experience.

🛠️ Developer Tools
(9K)
17
Atmotube PRO 2
Atmotube PRO 2
Atmotube PRO 2
Track real-time air quality
Free
💪 Health & Fitness
(2)
18
CO2 Monitor 2
CO2 Monitor 2
CO2 Monitor 2
by himpel
Free
🌟 Lifestyle
(0)
19
CO2 Check
CO2 Check
CO2 Check
Be Aware Of Your Air
Free

Monitor carbon dioxide levels remotely and receive real-time readings and push notifications when levels become unhealthy. Stay on top of air quality and take action to improve ventilation and keep your environment safe.

🌟 Lifestyle
(15)
20
Bubble Level ( Water level )
Bubble Level ( Water level )
Bubble Level ( Water level )
by Seong Eon Kim
Free

This application helps you determine if a surface is perfectly horizontal or vertical, making it useful for hanging pictures, shelves, or installing equipment. With its precise circular level and X and Y-axis measurements, you can easily check the tilt of any object or surface.

🔧 Utilities
(192)

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