• Smart Protractor 1
  • Smart Protractor 2
  • Smart Protractor 3
  • Smart Protractor 4

Smart Protractor

Smart Protractor is in the 1st set of the Smart Tools collection.
This app measures the angle and the slope of an object. It has three protractor modes.

1. Touch mode : for angle. After putting an object on the screen, touch the screen.2. Plumb mode : for slope. A weight shows the slope of your device.3. Camera mode : goniometer, inclinometer. It uses camera view.


* Main features:
- Tilt units (degree, percent, radian)
- Zero calibration
- Orientation sensor on/off
- Material design


* Pro version added features:
- No ads
- Various Tilt units
- Screen capture
- Ruler, Surface level, Thread pitch


* Do you want more tools?download [Smart Ruler Pro] and [Smart Tools] package.

For more information, watch YouTube and visit the blog. Thank you.

Category : Tools

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Reviews (30)

Rya. May 18, 2020     

Great App, does exactly what it says without clutter. 3 modes each useful for variety of tasks, drawing and measurement based. Interesting use of your phones camera to impose protractor image over. Haven't really tested this mode much, but was pleased to discover this ability and can see numerous situations where this could be useful practically.

Stu. Sep 7, 2021     

As a woodworker, I might use this and it seems OK, but could do with markings for commonly used angles like 45, 15, 30, 60 or these numbers highlighted. Also when using the touch setting there should be an option that will snap it to those angles because it's just too fiddly to hone in to the exact angle. If it had those features then it could be genuinely useful, otherwise it's just a novelty.

Rik. C. Nov 18, 2020     

Awesome app! I just wish you could tap on the angle and manually put in the degree and then match the desired angle to that number. Unless I'm missing it and it has that option (which is entirely possible) other than that it's exactly what i need. Thanks for the great app 👍

Bar. j. May 13, 2022     

Needed to get the pitch of existing roof in order to add additions, app worked well.

Big. B. Feb 21, 2022     

Tricky to read when screen does not auto rotate. Great tool if, you can contort your head n body around.

Phi. B. May 28, 2021     

Important to have a decent spirit level to calibrate. Thereafter, excellent though a bit fiddly to avoid touching screen with bevel edged phone.

Blu. Apr 6, 2020     

I found out early on that the actual protractor part that's supposed to line up is a level that I tried to calibrate but I couldn't even manage to do, just get a real protractor.

Bru. G. Dec 26, 2020     

Works great.. And very accurate . I use it for any leveling, or precise welding projects. Will be using it for checking my satellite dish fine tuning.

Wil. C. May 14, 2020     

This used to be ok with small ads near bottom of screen... after update a full screen ad pops up as soon as I open app and I still have yhe banner ads near bottom... deleted

San. F. Apr 27, 2021     

I wish you could make a floating widget option so we can also measure virtual things specially now were having online classes and everything is virtual. Or at least we can able to change the background with pictures to be able to measure other things on our screen.

Dav. W. Oct 26, 2018     

Handy/Dandy App. Used it to calculate dipsy diver fishing lure depth, (along with some trig), while trolling for King Salmon. Worked great ! We caught fish that were shown on the graph at specific depths. Hoorah ! ;)

Joh. K. Apr 12, 2020     

Not aesthetically pleasing watching the protractor go upside down, maybe if app would rotate with screen rotation to see protractor work with gravity as it does in planet Earth.

Bil. C. Nov 28, 2020     

I can't find my angle cube and I just ran across this app. Appears to work great! I will try it out on the table saw tomorrow. Six stars ⭐⭐⭐⭐⭐⭐ if it accurately nails 30°

Joh. Jun 20, 2020     

This is a great little aid for checking angles, especially useful for getting your circular saw blades set up correctly.

Fis. S. Apr 29, 2021     

Good app, but there's no way to have the center of the angle in the center of the screen. Needed this to make lines with exact angles

chr. h. May 1, 2022     

Perfect , easy to use

k. w. Feb 26, 2022     

Use this now and then. Works well with no glitches.

Nia. M. Feb 28, 2021     

Looks great. I can't use it as I want to orent it on the other side of my phone due to the volume buttons.

ERI. B. May 11, 2022     

Its like having a level in my pocket.

A. G. u. Jan 23, 2019     

Nice, simple and straightforward application. A good addition to my "tool box" of applications.

Yey. E. Nov 30, 2018     

Good app..need improvement at thick of border for the angle especialy, and for first time there must be simulation for uaing app without see a video

mir. t. Aug 24, 2020     

This simple, easy, and useful app. I love it.. Don't believe me but i used this app during playing snooker, 😄 and it works..

Rob. E. Aug 14, 2019     

had to remove it. it was chewing trough my cellular data, even after I refused permission. it was using more data than the Facebook app!

Joh. R. Jun 27, 2020     

I had a feeling the "update" increased ads. I saw reviews and I was right. I took the update just to see, and deleted the app. 👋 Goodbye. Being greedy gets you nothing.

Hai. J. Aug 20, 2021     

Used to be ok. Now blaring, in your face annoying ads before you can use. Avoid, deleted now.

Tim. T. Nov 17, 2018     

Ad bar covers the protractor, making it useless. Why can't I just have a pay option with no ad?

Chr. M. Jan 8, 2019     

Needed this app to measure an angle that my father and I had to drill through a wall at today. Worked perfectly! My dad was very impressed.

Bub. T. G. Jul 19, 2020     

I don't remember this having ads. I guess the update changed that. Guess I'll be deleting

O_O. O. Apr 1, 2020     

To hard, had to delete the app from confusion but the app is good if you know how to control it.

Cha. E. May 2, 2020     

I think this is just an inclinometer. I was hoping to measure angles in photos.