Protractor Smart vs Protractor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Camera-based angle measurement
- Touch measure mode
- Plumb bob measure for slopes
- Polygon measurement (premium)
- Screenshot functionality
Read full descriptionHide 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 !!!
Protractor
Read full descriptionHide full description
PAID ACCESS REQUIRED Protractor is a paid app. A weekly or yearly auto-renewable subscription, or a one-time lifetime purchase, is required to use every feature after onboarding. There is no free version and no free trial. Measure any angle without a physical protractor. Drag two arms across the screen, aim the camera at a real object, or rest your phone on a slope and read the tilt live. Most angle apps give you one trick. Protractor gives you three measuring surfaces in one app — an on-screen protractor for photos and drawings, a see-through camera overlay for real objects, and a motion-sensor inclinometer for surfaces you can put your phone on. Every reading comes out in degrees, radians or percent grade, and roof work gets the rise-in-12 pitch on the same screen. WHAT YOU GET - Read the exact degree of any corner on a photo or drawing by dragging two arms and the vertex onto it - Point the camera at a wall, ramp, roof edge or shelf and measure the angle right on the live view - Turn your phone into a digital level that shows pitch, roll, percent grade and roof pitch as rise:12 at once - Lock a reading with Hold or Freeze so the number stays put while you climb down or move the phone - Keep every measurement in History with a photo thumbnail, plus your saved count, average and widest angle - Switch between degrees, radians and grade in one tap, with a built-in conversion table for common values PERFECT FOR - DIY and home projects: shelves, picture rails, ramps, furniture - Roofing, decking and construction: slope, grade and pitch checks - Woodworking and metalwork: bevels, miters and corner angles - Students and teachers measuring angles on diagrams and photos WHY NOT JUST USE A PLASTIC PROTRACTOR A plastic protractor only works on paper, only reads what fits inside its arc, and is never in your pocket when the roof needs checking. This one measures on a photo, through the camera, or straight off a surface — and it remembers every reading instead of you writing them on a scrap of wood. PRIVACY Everything is measured and stored on your device. No account, no sign-up, no cloud upload of your photos or readings. The camera feed is used only to draw the protractor on top of it, and the app works with no internet connection. FULL ACCESS Full access unlocks the camera protractor, the live inclinometer, saved measurement history and all angle units. It is offered as a weekly subscription, a yearly subscription, or a one-time lifetime purchase. Your exact plan and price are shown before you confirm, and subscriptions renew until cancelled in your App Store settings. Open Protractor, point it at the next angle you need, and get the number in seconds. Terms of Use (EULA): https://web-levi.web.app/terms Privacy Policy: https://web-levi.web.app/privacy-policy Questions? Email tphuc.work@gmail.com
Screenshots
Verdict
The clearest difference is update cadence: Protractor at every 6 weeks against Protractor Smart's every 21 months. Protractor Smart's advantage is device support (3 vs 1) and iOS requirement (14.0 vs 17.0). On price, ads and in-app purchases 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. Protractor Smart sells 1 one-off in-app purchase and Protractor sells 3 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.
Protractor Smart ships an update every 21 months, Protractor every 6 weeks. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.
| Parameter | Protractor Smart | Protractor |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (247 ratings) — better | — |
| Positive reviews | 43.6% of reviews | — |
| Number of ratings | 247 — better | — |
| Update frequency | Every 21 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 14.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 11 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | ExaMobile S.A. | Phuc Pham |
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 moreShow fewer
- 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 moreShow fewer
- Fix upside-down protractor on iOS
Protractor
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Protractor Smart
- AdBlock - Remove ads$1.99
Protractor
- Incline Gauge Weekly$4.997 Days
- Roof Pitch Yearly$24.991 Year
- Bevel & Degree, Pay Once$49.99
Questions
Is Protractor Smart free?
Is Protractor free?
Do Protractor Smart or Protractor have ads?
Which is updated more often, Protractor Smart or Protractor?
Other comparisons















