Angle Finder vs Protractor
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Angle Finder
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Is the shelf actually level? Set your phone on it and know in two seconds. Angle Finder turns the motion sensor into a spirit level, inclinometer and plumb tool: a round bubble for surfaces, a plumb readout for walls and posts, and slope in degrees, percent or millimetres per metre. It reads gravity through CoreMotion's fusion filter โ not raw accelerometer noise โ so the number settles fast and stays put. Lay the phone flat and you get the bubble; stand it on an edge against a door frame and it switches to plumb mode on its own, because those are two different measurements and the app knows which one you need. WHAT YOU GET โข Set the phone on the shelf and watch the bubble drift to the high corner โ nudge the shim until it sits dead centre โข Stand the phone against a stud, post or picture frame and read exactly how many degrees to rotate to plumb โข Read slope your way: 1.2ยฐ, 2.1% or 21 mm/m โ the fall your drain or ramp needs, straight off the dial โข Tap Hold with the phone pressed under a joist, pull it out, and read the frozen number in the light โข Zero against a surface you trust, so a slightly tilted bench stops polluting every reading after it โข A haptic tick the instant you hit level, so your eyes stay on the picture wire, not the screen PERFECT FOR โข Renters hanging pictures, mirrors and floating shelves without a second pair of hands โข DIY TV mounting โ check the bracket is level before you drill, plumb after โข Carpenters and site work: pitch and roll at once, ratio rise, mm-per-m fall โข RV and trailer campers levelling the rig before the fridge complains WHY NOT JUST THE BUILT-IN MEASURE APP? Apple's level shows one view in one unit. It has no slope percent, no mm/m, no hold button, no zero calibration, no haptic level alert and no target fall. The moment you need "2% towards the drain" instead of "roughly flat", it is out of its depth. PRIVATE BY DEFAULT Every reading comes from the motion sensor, on the device. No account, no location, no tracking, no data leaving your phone. FULL ACCESS Full Access unlocks the repeat-work tools: saved zero presets (zero against a bench, a jig, a van floor โ and switch between them without re-zeroing) and target angle mode, which shows your distance from a chosen fall like 2% for a drain instead of distance from level. Choose a weekly or yearly auto-renewing subscription, or a one-time lifetime purchase. Put your phone on the surface and find out what "level" really looks like. Terms of Use: https://leanstudio.asia/terms-of-use Privacy Policy: https://leanstudio.asia/privacy-policy Support: support@leanstudio.asia
Protractor
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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 โ 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 โ 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 in-app purchases: Angle Finder at none against Protractor's 3. Protractor's advantage is update cadence (every 6 weeks vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Protractor sells 3 in-app purchases, starting at $4.99 per 7 days. Angle Finder asks for nothing beyond the download.
Angle Finder ships an update every 3 months, Protractor every 6 weeks. The most recent releases landed on October 9, 2026 and October 3, 2026 respectively.
| Parameter | Angle Finder | Protractor |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Every 6 weeks โ better |
| Ads | No | No |
| In-app purchases | No โ better | Yes |
| Devices | iPhone | iPhone |
| Requires iOS | 17.0 | 17.0 |
| Further details โ not scored | ||
| Size | 3 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | LEAN ASIA CO., LTD | Phuc Pham |
In-app purchases
Angle Finder
No in-app purchases
Protractor
- Incline Gauge Weekly$4.997 Days
- Roof Pitch Yearly$24.991 Year
- Bevel & Degree, Pay Once$49.99
Questions
Is Angle Finder free?
Is Protractor free?
Do Angle Finder or Protractor have ads?
Which is updated more often, Angle Finder or Protractor?
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