Comparison

Protractor vs Slope Level RX

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

Head to head
About

Protractor

Features
Read 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

About

Slope Level RX

Features
Read full description

Slope Level turns your iPhone into a clear and practical slope meter for everyday measuring tasks. Use it to check surfaces, shelves, frames, tripods, vehicle parking angles, camping ground, and other non-certified measurement needs. The main screen opens directly to live readings, so you can measure without menus or setup. Key features: • Real-time slope and tilt measurement • Plane mode for flat surfaces • Edge mode for one-axis angle checks • Zero calibration for relative measurement • Hold current reading • Save local measurement history • Switch between degrees, percent grade, and slope ratio • Light and dark appearance with configurable theme colors • Works offline and does not require an account Slope Level is designed for quick reference and everyday utility. It is not a certified industrial measuring instrument and should not be used for safety-critical or regulated engineering measurements. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Protractor4 screens
Slope Level RX3 screens

Verdict

The call

The clearest difference is price: Protractor at Free against Slope Level RX's $1.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Protractor is free to download; Slope Level RX costs $1.99 up front. Protractor sells 3 in-app purchases, starting at $4.99 per 7 days and Slope Level RX sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Protractor ships an update every 6 weeks, Slope Level RX every 3 weeks. The most recent releases landed on September 24, 2026 and September 9, 2026 respectively.

Scorecard1 real difference Ā· 5 level
Protractor versus Slope Level RX: the parameters behind the verdict, then further details
ParameterProtractorSlope Level RX
PriceFree — better$1.99
Update frequencyEvery 6 weeksEvery 3 weeks — better
AdsNoNo
In-app purchasesYesYes
DevicesiPhoneiPhone
Requires iOS17.017.0
Further details — not scored
Size5 MB2 MB
Age rating4+4+
DeveloperPhuc Pham浩东 许

In-app purchases

3 purchases

Protractor

Subscriptions2
  • Incline Gauge Weekly$4.997 Days
  • Roof Pitch Yearly$24.991 Year
One-time1
  • Bevel & Degree, Pay Once$49.99
1 purchases

Slope Level RX

One-time1
  • Lifetime Membership$2.99

Questions

Is Protractor free?
Protractor is free to download, with in-app purchases available.
Is Slope Level RX free?
Slope Level RX costs $1.99, and also offers in-app purchases.
Do Protractor or Slope Level RX have ads?
Neither Protractor nor Slope Level RX shows ads.
Which is updated more often, Protractor or Slope Level RX?
Protractor ships an update every 6 weeks, and Slope Level RX every 3 weeks. Most recently, Protractor was updated on September 24, 2026 and Slope Level RX on September 9, 2026.

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