# Protractor

> Protractor with Markers, Plumb Lines and Camera View.

Canonical page: [https://chrome-stats.com/d/com.keuwl.protractor](https://chrome-stats.com/d/com.keuwl.protractor)

## Overview

- **ID:** `com.keuwl.protractor`
- **Platform:** Android
- **Type:** Android app
- **Status:** Removed
- **Publisher:** keuwlsoft
- **Category:** TOOLS
- **Downloads:** 1,836,483
- **Rating:** 3.93 / 5 (3,055 ratings)
- **Version:** 1.08
- **Last updated:** 2024-02-19
- **First published:** 2015-11-28
- **Size:** 3.38 MB
- **Data as of:** 2025-05-13
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.keuwl.protractor)
- **Website:** [http://www.keuwl.com](http://www.keuwl.com/)
- **Privacy policy:** [https://www.keuwl.com/privacy\_policy/pp5.html](https://www.keuwl.com/privacy_policy/pp5.html)

## Description

The Protractor Chrome extension is a powerful tool for precise angle measurement directly within your browser. It features a live camera view with pause functionality, allowing you to capture and analyze angles accurately. You can place two markers to measure the angle between them effortlessly.

Additionally, it offers horizontal and vertical plumb lines that you can snap to markers for enhanced precision. With tap and double-tap controls, tracking and releasing markers is intuitive and user-friendly. The built-in calibration button lets you adjust the accelerometer to ensure your plumb lines remain reliable. Once measured, angles can be copied to your clipboard in both degrees and radians, streamlining your workflow. Ideal for professionals and students alike, this extension turns your device into a handy digital protractor.

## Permissions and access

### Permissions

- `android.permission.CAMERA`
- `android.permission.FLASHLIGHT`
- `com.keuwl.protractor.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`

## Review summary

The Protractor app is praised for its camera overlay feature, ease of use, and being free without ads, making it useful for woodworking and similar tasks. However, several users report issues like camera focus problems, UI glitches on specific devices, inability to move the protractor fulcrum, and lack of features like freezing measurements or inputting exact angles. Tilting the phone can also distort readings. Despite these drawbacks, many find it useful for rough angle measurements and simple projects.

### Pros

- The app provides a camera overlay protractor which is helpful for measuring angles in real-time.
- It is ad-free and free to use, which is appreciated by users.
- Users find it useful for tasks like woodworking, machining, and antenna setup.
- The app's design and functionality are generally considered good and easy to use.
- Calibration enables reasonably accurate angle measurements for non-industrial precision work.

### Cons

- Camera mode has focusing issues leading to blurry images and difficulty measuring.
- UI problems occur on certain devices (e.g., Galaxy S8, LG V35) like truncated display or disappearing UI elements.
- Users cannot move the protractor's fulcrum or measure angles below the line, limiting usability.
- The app lacks features such as freezing measurements, typing in exact angles, or importing photos for measurement.
- Tilting the phone causes distortion in angle measurements due to assumed camera/display aspect ratios.

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.keuwl.protractor)