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Compare Chrome extensions: ScanQR vs React Developer Tools

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Stats ScanQR ScanQR React Developer Tools React Developer Tools
User count N/A 4,000,000+
Average rating 2.88 3.98
Rating count 187 1,509
Last updated 2019-03-05 2024-04-18
Size 53.77K 2.52M
Version 0.0.4.0 5.1.0 (4/15/2024)
Short description
Scans QR codes using your webcam. Adds React debugging tools to the Chrome Developer Tools. Created from revision b566064da on 4/15/2024.
Full summary

Scans QR codes and displays their contents on a Chromebook or other computer with a suitable webcam. What's a "suitable" webcam? It's one that can focus the QR code within the red square in the app sharply enough that the app can decode it. My test results:

  • Chromebook Pixel: yes
  • Samsung ARM Chromebook: yes
  • Acer C7 Chromebook: yes
  • CR48: yes
  • 2009 MacBook Pro: yes, except for very small, dense QR codes
  • 2011 iMac: no, unless the QR code is ridiculously large (over one foot across)

If Chrome implements an API to let developers adjust camera-focus settings, I'll be able to improve the app to work with more cameras.

Source: https://github.com/sowbug/scanqr-app

React Developer Tools is a Chrome DevTools extension for the open-source React JavaScript library. It allows you to inspect the React component hierarchies in the Chrome Developer Tools.

You will get two new tabs in your Chrome DevTools: "⚛️ Components" and "⚛️ Profiler".

The Components tab shows you the root React components that were rendered on the page, as well as the subcomponents that they ended up rendering.

By selecting one of the components in the tree, you can inspect and edit its current props and state in the panel on the right. In the breadcrumbs you can inspect the selected component, the component that created it, the component that created that one, and so on.

If you inspect a React element on the page using the regular Elements tab, then switch over to the React tab, that element will be automatically selected in the React tree.

The Profiler tab allows you to record performance information.

This extension requires permissions to access the page's React tree, but it does not transmit any data remotely. It is fully open source, and you can find its source code at https://github.com/facebook/react/tree/master/packages/react-devtools-extensions.