Best protractor app for iPhone

Comparison table

1. #1 Protractor — Angle, Slope & Level Measure

   Best overall · Free to try · iOS & Android

   Reads the live angle straight from the accelerometer and gyroscope, with a camera protractor for angles you can’t touch, one-tap zeroing, and switchable degrees / percent / X-in-12. Ad-free, works offline, free to try on iPhone and Android.

   Pros

   • Sensor, camera, slope, and level modes in one
   • Degrees, % grade, and X-in-12 without re-measuring
   • Ad-free, offline, free to try

   Cons

   • Subscription after the free trial
   • Phone sensors top out around ±0.5–1° — a calibrated gauge is tighter
   

2. #2 Protractor+ (Tue Nguyen Minh)

   Good if you want the most-reviewed app

   The most-rated protractor app on the App Store (over 10,000 US ratings, around 4.1★). It reads the real sensors and covers the basics — protractor, angle meter, clinometer. The trade-off is age: the interface hasn’t changed much in years, and it is free with in-app purchases rather than fully free. A legitimate option if review count and track record matter most to you.

   Pros

   • Large review base
   • Covers protractor, meter, and clinometer
   • Long track record

   Cons

   • Dated interface
   • In-app purchases (check the listing)
   • iOS only

3. #3 Protractor for Angle Measuring (AppLiks)

   Good if you want a modern iPhone-only UI

   A newer app (about 1,000 US ratings, 4.5★) that currently tops the App Store search for "protractor". Clean design and a camera mode. It is subscription-style: read the In-App Purchases line and the most recent reviews before you install so you know when the paywall arrives.

   Pros

   • Modern interface
   • Camera mode
   • High rating

   Cons

   • Subscription-style pricing
   • iOS only
   • Fewer units and modes than the top pick

4. #4 Apple Measure (built-in Level)

   Good if you only need level

   Every iPhone ships with Apple’s Measure app, and its Level tab shows tilt in whole degrees. It is not a protractor — no camera angle, no percent or ratio, no zeroing between two faces, and the reading is rounded to 1°. Fine for “is this shelf level”; not for a miter or a roof pitch. In the US App Store, Measure itself averages 3.1★ from about 1,800 ratings.

   Pros

   • Free and pre-installed
   • Good enough for level checks

   Cons

   • Whole-degree readout only
   • No protractor, camera, slope %, or ratio modes
   • Can’t zero between two surfaces

5. #5 Angle Meter 360 (Alexey Kozlov)

   Good if you only need 0–360° tilt

   A focused angle meter (a few hundred US ratings, around 4.4★) that reads the full 360° of tilt. Does one thing well; you won’t find camera measuring or slope conversions here.

   Pros

   • Simple 360° readout
   • Light and fast

   Cons

   • Single mode
   • No camera or percent / ratio units

6. #6 Digital angle gauge (Wixey, Klein, GemRed)

   Good if you need ±0.1–0.2°

   A magnetic cube with an LCD that sticks to a saw blade or fence. Tighter than any phone (±0.1–0.2°) and happier in a dusty shop. The right second tool for set work — and the wrong first tool for the quick checks that make up most measurements.

   Pros

   • ±0.1–0.2° precision
   • Magnetic base for blades
   • No phone in the sawdust

   Cons

   • $20–$60 and a battery to keep charged
   • Single-axis tilt only
   • Easy to leave at the bench

7. #7 Generic "protractor" apps

   Avoid

   The store is full of protractor apps with fewer than a dozen ratings, aggressive ads, or a paywall on the first tap. Some don’t read the sensors at all and just draw a protractor image. Check the rating count and the In-App Purchases line before installing.

   Cons

   • Ad-heavy or paywalled on first use
   • Tiny or missing review base
   • Some are just a picture of a protractor

How we picked

Common questions