Comparison

Protractor Smart vs OrthoMeasure

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

Head to head
About

Protractor Smart

This app acts as a smart instrument for measuring angles using your device's camera. It offers two free modes for measuring angles on screen or using a plumb bob for slopes, with an additional premium mode for polygon measurements.

Highlights
  • Camera-based angle measurement
  • Touch measure mode
  • Plumb bob measure for slopes
  • Polygon measurement (premium)
  • Screenshot functionality
Features
Read full description

Protractor - smart instrument to measure angles. Turn on the camera mode and measure the angle of buildings, mountains, or any other object around you. This app includes two free measuring modes: - Touch measure - touch the screen to set the angle (use camera view!). - Plumb bob measure - pendulum - use to determine the slope (remember to calibrate the plumb). In each mode, you can switch to camera view and take measurements of all objects around you. Additional Premium mode: Polygon measurement lets you draw any shape on your screen to check all its angles. Turn on the camera to see the real object through your phone and copy its shape. You can also pick a photo from your gallery or take a new picture to draw a shape on the image. In Premium mode, you can change colors, add helper lines, and switch between different angle units. All modes allows you to make a screenshot of anything on the screen. Enjoy !!!

About

OrthoMeasure

Accurately measure clinical angles using your iPhone's motion sensors. This digital goniometer provides precise readings on X-rays or during examinations with a simple two-tap system. Get instant, clear display of all corresponding angles.

Highlights
  • Precise angle measurement
  • Simple 2-tap system
  • Visual angle display
  • Full angle display (acute, obtuse, reflex)
  • Clean, dark-mode interface
  • Uses device motion sensors
Features
Read full description

Measure clinical angles with precision and ease. OrthoMeasure turns your iPhone into a fast, accurate digital goniometer, perfect for measuring angles on X-rays, during clinical examinations, or anywhere you need a reliable reading. Stop guessing or relying on bulky physical tools. OrthoMeasure uses your device's advanced motion sensors to calculate angles with just two simple taps. HOW IT WORKS: Align First Line: Hold your iPhone parallel to the first line (e.g., the top of the spinal curve). Tap to Set: Tap the screen to lock the first angle. Align Second Line: Hold your iPhone parallel to the second line (e.g., the bottom of the curve). Tap to Measure: Tap a final time. OrthoMeasure instantly calculates all four corresponding angles (e.g., 35°, 145°, 215°, 325°) and displays them clearly. FEATURES: High Precision: Uses your device's core motion sensors for accurate, repeatable measurements. Simple 2-Tap System: No complex buttons. Align, tap, align, and tap again. Visual Guide: See the lines you've measured drawn on the screen. Full Angle Display: Instantly get the acute, obtuse, and reflex angles for a complete picture. Clean Interface: A beautiful, dark-mode-friendly interface that stays out of your way. Designed for orthopedic surgeons, chiropractors, physiotherapists, and medical students, OrthoMeasure is the modern, simple way to get the angle you need.

Screenshots

Protractor Smart4 screens
OrthoMeasure3 screens

Verdict

The call

The clearest difference is review sentiment: OrthoMeasure at 100% against Protractor Smart's 44%. OrthoMeasure also leads on in-app purchases (none vs 1) and update cadence (every 5 days vs every 21 months). Protractor Smart's advantage is ratings volume (246 vs 2) and device support (3 vs 1). On price and ads 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. Protractor Smart sells 1 one-off in-app purchase. OrthoMeasure asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

OrthoMeasure holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Protractor Smart has 246 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 44% of Protractor Smart's written reviews are positive against 100% of OrthoMeasure's.

UpkeepUpdate frequency

Protractor Smart ships an update every 21 months, OrthoMeasure every 5 days. Both last shipped on October 24, 2026.

Scorecard8 real differences · 2 level
Protractor Smart versus OrthoMeasure: the parameters behind the verdict, then further details
ParameterProtractor SmartOrthoMeasure
PriceFreeFree
Rating4.6 (246 ratings)5.0 (2 ratings) — better
Positive reviews43.6% of reviews100.0% of reviews — better
Number of ratings246 — better2
Update frequencyEvery 21 monthsEvery 5 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS14.0 — better17.6
Further details — not scored
Size11 MB3 MB
Age rating4+12+
DeveloperExaMobile S.A.Hadi Altabatabaae

Customer experience

Protractor Smart

All ratings242 ratings
Positive91.3%
Neutral1.7%
Negative7.0%
Written reviews55 reviews
Positive43.6%
Neutral5.5%
Negative50.9%

OrthoMeasure

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Protractor Smart

Reported bugs

8 issues
  • App loads indefinitely
  • App does not launch after iOS updates
  • Stuck on loading screen
  • Photo upload not possible in premium version
  • Upside-down protractor on iOS
Show 3 more
  • Phone locks during use
  • Camera mode is terrible and inaccurate
  • Poor calibration

Requested features

6 requests
  • Improve camera function (light, zoom)
  • Add automatic hold function
  • Increase digital readout size
  • Add more skins/cosmetics
  • Option to remove ads
Show 1 more
  • Fix upside-down protractor on iOS

OrthoMeasure

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Protractor Smart

One-time1
  • AdBlock - Remove ads$1.99
None

OrthoMeasure

No in-app purchases

Questions

Is Protractor Smart free?
Protractor Smart is free to download, with in-app purchases available.
Is OrthoMeasure free?
OrthoMeasure is free to download, with no in-app purchases.
Which has better reviews, Protractor Smart or OrthoMeasure?
OrthoMeasure is rated higher. Protractor Smart averages 4.6 out of 5 from 246 ratings, while OrthoMeasure averages 5.0 from 2 ratings.
Do Protractor Smart or OrthoMeasure have ads?
Neither Protractor Smart nor OrthoMeasure shows ads.
Which is updated more often, Protractor Smart or OrthoMeasure?
Protractor Smart ships an update every 21 months, and OrthoMeasure every 5 days. Most recently, Protractor Smart was updated on October 24, 2026 and OrthoMeasure on October 24, 2026.

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