Toolbox PRO vs Flying Ruler
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Toolbox PRO
Transform your device into a versatile measuring toolkit. It offers a comprehensive suite of 13+ tools including a barometer, altimeter, compass, metronome, stopwatch, timer, and various levels for diverse applications.
- Barometer for atmospheric pressure
- Altimeter for elevation above sea level
- Compass for navigation
- Metronome for musicians
- Stopwatch with lap and split modes
- Multiple timers running simultaneously
- Surface and spirit levels
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The most handy measuring tool kit in the world. Turning your iPhone or iPad into a multi functional measuring device with: metronome, stopwatch, timer, seismometer, ruler, surface level and many more. Currently, there are 13 measuring tools + Flashlight in the tool box: - BAROMETER It gives you a nice and clear local atmospheric pressure, obtained from the barometric sensor in your device - ALTIMETER This tool takes advantage of the built in GPS to give you the precise elevation above the sea level. - COMPASS A pretty and well-made compass for navigation, traveling and direction reference purposes. - TESLAMETER It takes advantage of the built-in magnetometer in your iPhone/iPod touch, allows you to monitor the strength of magnetic field all around. There are a range of real-life applications for this useful item, such as: metal detector, AC magnetic fields, or finding low-magnetic places for sleeping - METRONOME It is the most precise and stable metronome on the app store. Whether you are a musician, a music teacher, a beginner at playing music or even a golfer, this tool provides you a set of powerful features that can satisfy all your needs. - STOPWATCH Whenever you need a precise and professional stopwatch for sport activities like: sprints, jogging, this tool is a must have. Among its features are: intuitive interface, lap and split modes support, or send log results to your email - TIMER There are unlimited applications of using timer in daily life, such as: egg timer, tea timer, cooking, alarm clock, etc. The timer tool satisfies all of those needs by many of its features: up to 5 timers running simultaneously, count down and count up support, intuitive and convenient duration setup using preset and gestures - SEISMOMETER Taking advantage of the built-in accelerometer in your iPhone, this tool detects and visualizes any vibrations and moves of the iPhone. So, why not using this excellent feature to help your iPhone self-protected like a car when combined with an alarm? Or another great application is to test how smooth the car is on a test drive - PLUMB BOB This is an instrument to check if an object is perfectly vertical/plumb and has been used since the time of the ancient Egyptians. It suits any types of your needs, such as: hanging objects, carpenter work, brick layer or building construction - SURFACE LEVEL This tool facilitates the measurement of the slope of whatever surface you want to check. Most importantly, its accuracy is ensured at the maximum level by the support to different sensitivities that allow you to detect subtle slopes (floor leveling, furniture arrangement,..) - SPIRIT/BUBBLE LEVEL It is a simple but extremely useful tool in the set to check if an object is balanced. Its applications range from entertained purposes such as checking pool billiard tables in the bar to serious usages like constructions, carpenter, etc - RULER The ruler helps you precisely know the lengths of objects all around you, such as pens, tables, pictures. We built it to become even more than just a normal ruler: longest distance measuring capability, and up to 6 units support - PROTRACTOR Have you ever forgotten your protractor at school or when you urgently look for a protractor to measure any kind of angles in real life?
Flying Ruler
Measure distances and angles using your device's sensors. This app functions as a ruler, tape measure, rangefinder, protractor, and 3D angle finder, offering a quick and accurate way to take measurements in various conditions.
- Measure distance by moving device
- Ruler, tape measure, rangefinder
- Protractor and 3D angle finder
- Inertial navigational system technology
- Adjustable units (inches/cm)
- Save measurements with photos
- Avoid obstacles during measurement
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The Flying Ruler app allows you to measure in the most original way: by just moving your device from one point to another. Flying Ruler is a ruler, tape measure, rangefinder, protractor and a 3D angle finder. It is five devices in one app, providing you with the quickest way to measure a distance or an angle. The secret of the program is that it is based on the principles of the inertial navigational system (INS): the position of the device is determined with the help of the accelerometer and the gyroscope. Measurements take place extremely quickly and at the same time they are quite accurate. We are constantly improving our computational algorithm for more than 11 years! To try this technology for free you can install the app "Digital Angle Finder: 3D Meter". This free app measures the angle as you move the device. AWARDS: Editor's Choice — 148Apps www.148apps.com/reviews/flying-ruler-review PRESS ABOUT US: "I was impressed with Flying Ruler’s accuracy. It works quickly and effectively", "It’s the perfect addition to anyone’s app collection" — 148apps 4.5 / 5 (MUST HAVE) "This thing is awesome" — brettterpstra.com "I literally said “wow!” when I first used this app and I think it’s a truly impressive marvel of mobile technology", "The Flying Ruler Rules" — AppPicker (Cons: there is nothing negative to say about this app) *** Measure distance with good precision, no matter the lighting or conditions *** The app has different modes so you can choose which mode is better and easier to use on each occasion. You can measure with the body of the device in one mode or with a virtual tape measure in another. You can not only measure an object but also the distance between two walls (rangefinder mode). You use the same methods to measure angles as the app allows you to measure angles both on a surface area (protractor mode) and between surfaces through space (3D angle finder mode). You can choose either inches or centimeters. The maximum distance is only limited by the value of the indicator which consists of 999 ft for the imperial system and 99 m for the metric system. When measuring, you can avoid obstacles and therefore you can measure anything. Flying Ruler is suitable for measuring not only large, but also very small distances with the accuracy of a standard ruler. The app also allows you to save a measurement by taking a photograph of the measurement and mark the place that was measured. Don’t forget to show your friends and colleagues how the app works – believe us, they will be impressed. ACCURACY OF MEASUREMENT: We took 100 consecutive measurements and got these results: On iPhone 13: • Mean squared error - 0.14% • Maximum inaccuracy - 0.4% On iPhone 7: • Mean squared error - 0.15% • Maximum inaccuracy - 0.4% On iPhone 6s: • Mean squared error - 0.28% • Maximum inaccuracy - 1.1% The accuracy of measurements depends on the device, however the error rarely exceeds 1.5%. You can always increase accuracy by making a series of measurements. If you make a series of measurements, the degree of error is usually 0.3% or less. Angles can be measured with the app to an accuracy of one degree so the app can easily take the place of a protractor or a angle finder. WEBSITE: www.flying-ruler.com
Screenshots
Verdict
The clearest difference is rating: Toolbox PRO at 4.5 against Flying Ruler's 4.1. Toolbox PRO also leads on update cadence (fortnightly vs every 2 months) and ratings volume (3.5K vs 186). Flying Ruler's advantage is review sentiment (86% vs 62%) and price ($1.99 vs $3.99). On ads, in-app purchases, monetization model and device support 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
Toolbox PRO costs $3.99 and Flying Ruler $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Toolbox PRO holds the better App Store score, 4.5 against 4.1. That said, the two scores are not equally well evidenced: Toolbox PRO has 3.5K ratings behind it against 186, so its average is the more settled of the two. Written reviews complicate that: 62% of Toolbox PRO's written reviews are positive against 86% of Flying Ruler's, so the app with the better star average is not the one people write more warmly about.
Toolbox PRO ships an update fortnightly, Flying Ruler every 2 months. The most recent releases landed on November 10, 2026 and November 6, 2026 respectively.
| Parameter | Toolbox PRO | Flying Ruler |
|---|---|---|
| Price | $3.99 | $1.99 — better |
| Rating | 4.5 (3.5K ratings) — better | 4.1 (186 ratings) |
| Positive reviews | 61.7% of reviews | 86.3% of reviews — better |
| Number of ratings | 3.5K — better | 186 |
| Update frequency | Fortnightly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 27 MB | 78 MB |
| Age rating | 4+ | 4+ |
| Developer | SkyPaw Co., Limited | ALEXEY BRILEV |
Customer experience
Toolbox PRO
Flying Ruler
User reviews
Toolbox PRO
From 3.5K App Store ratingsWhat we love
- 🚀 Useful tools in one app
- 👍 Intuitive interface
- 🔧 Variety of measurement tools
- ⚙️ Accurate measurements
- 💡 Innovative features
Room to improve
- 🐛 Crashes and compatibility issues
- 🔍 Inaccurate measurements
- 🔒 Privacy concerns with location access
- 💰 Paid features removed from previous versions
- 📚 Lack of instructions or guidance
Flying Ruler
From 186 App Store ratingsWhat we love
- 👍 Easy to use
- 🚀 Convenient for quick measurements
- 💡 Clever use of phone sensors
- ⭐ Accurate for most use cases
- 🎨 Visually appealing interface
Room to improve
- 🐛 Inconsistent measurement accuracy
- 📏 Not as precise as a physical ruler
- ⚠️ Requires multiple measurements for reliable results
- 🤔 Confusing calibration process
Bugs and requests
Toolbox PRO
Reported bugs
4 issues- Decibel meter missing from current version
- Ruler measurements inaccurate on newer devices
- Crashing issues with recent updates
- Barometer and altimeter not functioning properly
Requested features
5 requests- Temperature conversion tool
- Light meter
- Ability to calibrate tools
- Apple Watch app integration
- More customization options
Flying Ruler
Reported bugs
3 issues- Measurements vary wildly between attempts
- Calibration process fails to complete
- App crashes when used with certain phone cases
Requested features
4 requests- Add imperial unit support
- Integrate with smart home devices
- Provide more advanced measurement tools
- Improve accuracy for smaller distances
In-app purchases
Toolbox PRO
No in-app purchases
Flying Ruler
No in-app purchases
Questions
Is Toolbox PRO free?
Is Flying Ruler free?
Which has better reviews, Toolbox PRO or Flying Ruler?
Do Toolbox PRO or Flying Ruler have ads?
Which is updated more often, Toolbox PRO or Flying Ruler?
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