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Protractor

Protractor for measuring Angles. Free & No Ads.

• Camera view with Pause button.


• Measure angle between two markers.


• Horizontal and vertical plumb lines (Tap to snap nearest marker to line, double tap to track, tap again to release).


• CAL button to calibrate Accelerometer if plumb lines are out.


• Copy angle in degrees and radians to clipboard.

Category : Tools

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Reviews (28)

Ste. P. Aug 21, 2019     

I have used this app for several jobs over the last few months I have had it installed on my Samsung S7. The real time image overlay is fantastic and accuracy once calibrated with a good level makes a useful tool of the phone. Mind you don't include the buttons on the side of the phone when calibrating the phone. Thank you to the very generous maker/s for such a useful, ad free, free product.

Tan. R. Oct 1, 2020     

Does exactly what it says on the tin. I use it to set angles on a dipole antenna in inverted V formation to catch NOAA satellite imagry and it works a treat. My only gripe would be for there to be a way to manually type in the angle settings. As for us large fingered folk with small screens its a bit jittery and takes some finesse. I unknowingly use many apps by this dev, and they all function as advertised. Well worth the download.

Rob. P. Oct 26, 2018     

A good use of this app is estimating the sizes of sections on pie charts. Would be even better for this purpose if (in order of usefulness): 1. The camera focused up close. 2. Angles were shown in percent of circle (besides the current degrees and radians). 3. Option provided to show full circle protractor. 4. Possibility to add additional markers.

Ben. C. Nov 18, 2019     

I think if protractor could open a picture that I took with the phone camera and then let me move and turn the picture in the protractor app then you would have a really awesome app. When you try to hold the object to the Centerpoint of protractor it gets blurry. By using the camera first I cam get a sharp picture. Bring it into the app and the position it correctly to get my measurements.

Gar. H. May 5, 2019     

PROS : free of charge; no ads; beautiful graphics; overlays camera view. CONS : On my new phone (LGV35-ThinQ) the top of the protractor is truncated, (otherwise I'd give a five-star rating). I don't recall the display being truncated on my old phone.

Ian. M. Mar 15, 2019     

This is one of those apps I didn't know I needed until I downloaded it! Use the camera to overlay a protractor on a diagram or real-world objects to determine angle. Easy to read and easy to use. A very well-designed and functional app.

Nat. P. Oct 23, 2018     

Doesn't work on Galaxy S8. Tapped the camera feature, and while it showed the camera feed, all the UI disappeared, and now the app is useless. It's a shame, because what the app promised was exactly what I need.

Ash. K. Sep 27, 2018     

This app is USELESS. It asked me to go into camera mode...Except that is all the app did on my S8. It didn't tell me any angles at all. I couldn't back out of the camera, either. And if I closed the app to re open it, it would go back to the camera mode where I still could not back out. Useless app.

Mar. T. Apr 20, 2019     

This is exactly what i needed. I have a drawing and want to calculate several angles. The camera opens with a protractor overlay, perfect.

Ana. K. Dec 9, 2021     

I cannot find a protactor so I downloaded this app and I was really impressed by its back camera feature which makes me easier to measure on my notebook.

Chr. B. Dec 10, 2018     

This developer makes excellent apps. Add free and high quality. This protractor helped me find the pitch of my roof easily. The added camera function is essential.

Deo. V. d. W. Oct 30, 2021     

Wow. I don't get impressed easily. But this app is wow. I would love to be able to press on the screen to hold or to freeze the measurement. Maybe even give a verbal instruction.

Jak. May 16, 2021     

No ads When activating the flashlight it turns off after hitting the pause button. After unpausing the flashlight remains off. When flashlight button active, light should turn back on after unpausing.

Mar. Š. Feb 28, 2021     

Needed something that can approximate angle from a camera image hastily. Exactly what I was looking for. Thank you!

Eli. Y. Feb 7, 2022     

A lot of the reviews said the app was really good and they were impressed. I tried it out and i got the exact answer and i can say this was really helpful.

Kev. J. Nov 3, 2018     

Great app overall. Nitpick is that the camera won't autofocus, which makes it hard to measure things.

pup. Oct 21, 2019     

Another excellent tool from KeuwlSoft! I have found that they have many useful and interesting apps for android.

Jon. &. A. S. Oct 11, 2019     

Protractor overlay while in camera and angle lines you can move. Great app!

Dav. L. Jan 11, 2019     

this would be a five but the camera gets blurry when 5 inches or closer. if you could fix that then you'd probably get a 5

Pac. H. Oct 24, 2018     

Doesn't work. Stuck in camera mode with no interface like many other users here.

DVe. Oct 17, 2018     

Expected it to work on my LG stylo 4. Not a single function worked. Straight to camera mode. Suspiciously removed the app.

Eyo. B. Apr 14, 2020     

I love the app cos it's really easy to use and it comes in handy even if you're not on a perfectly horizontal surface

Iri. A. T. May 5, 2019     

I had to do my homework at Geometry and someone took my protactor and didn't give it back to me .I hadn't got my protractor anymore so I couldn't do my homework but this app saved me thanks a lot!!!!

Kal. H. Apr 23, 2021     

Good app. it would be great if it has a save button for the image.

Bis. C. Feb 17, 2019     

good app. in pause mode image slide option is added then it is very good

Row. V. Mar 6, 2022     

Very useful app...since I don't have protractor,i usually used this,and thanks to this is app..very useful 👍

Mic. P. Sep 4, 2021     

Protractor with the best options. Plubline, AR, guides. Perfect!

M. S. Jan 27, 2019     

great .. good job, I didn't have a proractor to complete my maths homework and this app saved my life lol.. thanks