Measure Angles vs DuctCalc.Ca
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Measure Angles
This app transforms your device into a versatile measuring tool. It offers precise angle readings with a digital protractor and bubble level, along with AR-powered distance and volume measurements. Ideal for professionals, DIY enthusiasts, and everyday tasks requiring accuracy.
- Digital protractor for angle measurement
- Bubble level for surface flatness
- AR-powered distance and volume estimation
- Integrated ruler and tape measure
- Compass and altimeter
- Timer and audio meter
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Measure Angles – Bubble Level turns your device into a powerful and versatile tool for precise angle measurement. It includes both a digital protractor and a bubble level, making it perfect for professionals, makers, and everyday users who need accurate angle readings for any task. Since 2016, Measure Angles - Bubble Level has been trusted by over 1.5 Milion users worldwide, this app combines advanced AR technology with a wide range of measurement tools to ensure accurate results in any situation — all with a simple tap on your screen. Key features: -2D Level Mode (Surface Level / Bubble Mode) – Measures the flatness or inclination of a surface, like a traditional spirit level. -Protractor Mode (Angle Finder / Protractor) – Measures angles between objects or surfaces accurately. -LED – Activates the device’s flashlight for visibility in dark environments. -Compass – Displays cardinal directions using the device’s built-in magnetic sensor. -Protractor – Another tool for measuring angles, useful for precise alignment tasks. -Ruler – Allows you to measure small distances directly on your device’s screen. -Camera Ruler – Uses the camera and AR to estimate real-world distances. -Timer – Multiple countdowns and stopwatch tool for timing tasks. -Altimeter – Displays your current altitude based on GPS or barometric pressure. -Audio Meter – Measures ambient noise levels in decibels using your microphone. Always 100% precise: Measure Angles - Bubble Level automatically adjusts to your device’s size and resolution for maximum accuracy. But that’s not just it! A Premium subscription to Measure Angles – Bubble Level will also grant you access to Tape Measure - Ruler - AR APP! Measure Angles - Bubble Level is your go-to tool for precise angle measurements, featuring an easy-to-use bubble level and digital protractor. Paired with Tape Measure – Ruler – AR App, which lets you accurately measure distances, heights, and 3D volumes like cubes and circles, this bundle gives you everything you need for full 360° measurement precision. Perfect for DIY, design, or professional use, this bundle will allow you to create and visualize with great precision the house and projects of your dreams! Privacy Policy: https://magic-cake-e95.notion.site/IOS-Measure-Angles-Bubble-Level-Privacy-Policy-23fcf6557a0880d9bb2fe9c37e0ae881 --- Terms & Conditions: https://magic-cake-e95.notion.site/IOS-Measure-Angles-Bubble-Level-Terms-Conditions-23fcf6557a0880179abdcee4e3dc715a If you have any questions or feedbacks, please contact us at ruler.measure.info@gmail.com Subscribe to access to premium app features; subscription details are the following: -Length: weekly or yearly -Free trial: only on selected subscriptions -Your payment will be charged to your iTunes Account as soon as you confirm your purchase -You can manage your subscriptions and turn off auto-renewal from your Account Settings after the purchase -Your subscription will renew automatically, unless you turn off auto-renew at least 24 hours before the end of the current period -The cost of renewal will be charged to your account in the 24 hours prior to the end of the current period -When canceling a subscription, your subscription will stay active until the end of the period. Auto-renewal will be disabled, but the current subscription will not be refunded -Any unused portion of a free trial period, if offered, will be forfeited when purchasing a subscription
DuctCalc.Ca
This utility app calculates duct dimensions and air velocity using two methods: Equal Friction and Velocity. It supports both round and rectangular ducts, offering precise calculations for HVAC professionals. Offline functionality is available with a subscription.
- Duct sizing calculator
- Equal Friction Method
- Velocity Method
- Round and rectangular duct support
- Offline functionality
- Full air flow range activation
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DuctCalc.Ca is the iOS offline version of the most popular online ductulator app (ductcalc.ca) Enjoy using the app with no internet connection when subscribed! App engineering explanation: ------------------------------ Equal Friction Method: Using a predefined static pressure loss per unit of duct length, DuctCalc.Ca Ductulator App calculates the diameter of round duct and the other dimension of rectangular duct. Based on the calculated dimensions, the air velocity will be calculated for both duct shapes and dimensions. Velocity Method: Using a predefined air velocity, DuctCalc.Ca Ductulator App calculates the diameter of round duct and the other dimension of a rectangular duct. Based on the calculated dimensions, the static pressure loss will be calculated for both duct shapes and dimensions. Note that unlike conventional ductulators, this ductulator will calculate the dimensions of the rectangular duct based on the given velocity and it then calculates the static pressure loss for the rectangular duct based on the given velocity and dimensions. Most old calculators will only use the given velocity to calculate the diameter of the round duct then it calculates the static pressure loss for the round duct and uses that static pressure to calculate the rectangular duct dimensions which is not the case here for more precise velocity output. Colebrook equation is used to solve for Darcy's friction factor and calculates the static pressure loss in the duct until it matches the desired input at defined airflow and absolute roughness of the inner material of the duct touching the moving air. In-App Purchases: ------------------- • With no subscription the app will calculate for an air flow range between (950 and 1100 [cfm]). To activate full air flow functionality. There are four subscription options: one month, three months, six months and one year. • All subscription options will activate the "Full Air Flow Functionality" of the duct sizing app for that specific subscription period. The full air flow range is (1 to 500,000 [CFM] or 1 to 235,974 [L/s] in metric units). • Payment will be charged to iTunes Account at confirmation of purchase. • Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Privacy Policy: https://ductcalc.ca/?page=agreement Terms of Service: https://ductcalc.ca/?page=agreement
Screenshots
Verdict
The clearest difference is rating: Measure Angles at 4.2 against DuctCalc.Ca's 1.9. Measure Angles also leads on update cadence (fortnightly vs every 4 months) and ratings volume (2K vs 20). DuctCalc.Ca's advantage is ads (none vs shown) and iOS requirement (11.3 vs 16.6). On price, review sentiment, in-app purchases and monetization model 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. Measure Angles sells 10 in-app purchases, starting at $2.99 per 7 days and DuctCalc.Ca sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Measure Angles holds the better App Store score, 4.2 against 1.9. That said, the two scores are not equally well evidenced: Measure Angles has 2K ratings behind it against 20, so its average is the more settled of the two. Written reviews complicate that: 47% of Measure Angles's written reviews are positive against 50% of DuctCalc.Ca's, so the app with the better star average is not the one people write more warmly about.
Measure Angles ships an update fortnightly, DuctCalc.Ca every 4 months. The most recent releases landed on November 13, 2026 and November 2, 2026 respectively.
| Parameter | Measure Angles | DuctCalc.Ca |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (2K ratings) — better | 1.9 (20 ratings) |
| Positive reviews | 46.9% of reviews | 50.0% of reviews — better |
| Number of ratings | 2K — better | 20 |
| Update frequency | Fortnightly — better | Every 4 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 16.6 | 11.3 — better |
| Further details — not scored | ||
| Size | 46 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | WHATSTICKER APPS SRL | Firas Kneifati |
Customer experience
Measure Angles
DuctCalc.Ca
Bugs and requests
Measure Angles
Reported bugs
4 issues- Angle appears reversed or flipped
- Angle locks too quickly
- App crashes on launch
- Measurements are inaccurate
Requested features
6 requests- Panoramic measurement tool
- Surround audio setup feature
- Ability to reset protractor to 0 degrees
- Black/white display for better readability
- Support for iPad split-screen
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- Instructions/tutorial for using the app
DuctCalc.Ca
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Measure Angles
- Weekly Premium7 Days trial$2.997 Days
- Weekly Premium$2.997 Days
- Weekly premium$4.997 Days
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- Weekly premium trial7 Days trial$4.997 Days
- Yearly premium trial7 Days trial$29.991 Year
- Yearly premium$29.991 Year
- Unlock all tools$1.99
- No ads$2.99
- Premium Discount$2.99
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- Premium Edition$3.99
DuctCalc.Ca
- One Month Full Air Flow$6.99
- Three Months Full Air Flow$17.99
- Six Months Full Air Flow$29.99
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- One Year Full Air Flow$49.99
Questions
Is Measure Angles free?
Is DuctCalc.Ca free?
Which has better reviews, Measure Angles or DuctCalc.Ca?
Do Measure Angles or DuctCalc.Ca have ads?
Which is updated more often, Measure Angles or DuctCalc.Ca?
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