What Is The Google Lighthouse Audit Tool? And How it works?

What is Google Lighthouse?

Lighthouse is a wonderful tool built by Google and was originally meant to audit Progressive Web Apps (PWA). The tool executes four audits for convenience, performance, Progressive Web Apps as well as an extended list of most outstanding practices. Recently, Google even extra a basic SEO check. Together, these offer you an outstanding overview of the quality as well as performance of your website or web app.

Site speed is entire about perception as well as user experience. Speed in numbers determine nothing if your website still feels slow. Large numbers of users around the world are on rather crappy mobile connections of 3G or less. Even with lightning-fast 4G connections, a site may simply feel slow. And we entire recognize what a devastating effect a slow site may have on your conversion. Shaving milliseconds of the time required to load your website could make a world of difference. It is available as a chrome extension as well as a node command line module.

During testing, Google Lighthouse simulates visit your mobile website via a flaky 3G connection on a slightly underpowered device. Packets are lost in an effort to simulate real-world conditions as authentically as possible. After running the test, you’ll obtain a report with a score and actionable advice with issues to tackle. Granted, the newly updated as well as redesigned Test My Site by Google is considerably more beautiful, but also a lot less comprehensive.

Lighthouse is an open-source, computerized tool for obtaining better the quality of web pages. You may run it against any web page, public or needing authentication. It has audits for performance, convenience, progressive web apps as well as more.

You may run Lighthouse in Chrome DevTools, from the command line, or as a Node module. You have to offer Lighthouse a URL to audit, it runs a series of audits against the page as well as then it makes a report on how well the page did. From there, use the failing audits as indicators on how to increase the page. Each audit has a indication doc explaining why the audit is significant, as well as how to fix it.

In early 2018, Google released an SEO tool called Lighthouse that provides insight on how to improve the quality of your webpages. The Google Lighthouse audit is an open-source automated tool that checks a page’s performance, accessibility as well as more.

Google Lighthouse is a webpage auditing tool that offers insights into a page’s performance, SEO, usability as well as convenience. It’s free to install as well as may be utilized on any public webpage.

There are a few ways web developers can implement these audits as well as even more ways that this new Google tool is changing the game of SEO. Let’s take a look:

What the Tool Checks

So what exactly are these reports that the Google Lighthouse audit offers? The audit reports on a few major factors for each web page, which are:

  • Overall performance
  • Progressive web applications
  • Accessibility
  • Good practices

The report information how visitors interact with these different elements of the page as well as what issues need fixing.


In each of the categories, the score is computed based on checks which failed as well as which passed. You may see precisely what was successful, what not as well as can read details about each check. On top of this, some categories have a list of extra manual checks – steps which cannot be validated automatically however are still significant and worth testing.

Overall Performance

The first category is Performance. It is no doubt a very significant area to focus on. Particularly since many users tend to have a low-quality network connection or access your site from mobile devices. Lighthouse takes this into consideration as well as simulates slow network connection as well as slow CPU. You may be surprised how worst your website performance is under such circumstances.

Lighthouse also measures while your page first displays some meaningful information, when it becomes interactive as well as when it is completely operational.

But what’s really useful is that the tool recommends you diverse ways how to increase the performance in your case with real data – that is how much time you can really save by addressing several problems.

Progressive Web App

Progressive Web Applications is a collection of design principles as well as guidelines by Google. It should result in a smooth user experience similar to native Mobile Application. It utilizes service workers so the application may work on low-quality networks or even offline. And while online it always has up-to-date data. It should be loaded over HTTPS only, utilize push notifications as well as offer excellent load times and performance.


This section covers accessibility that means making sure your app is method by as many users as possible. That typically shows that users with kind of impairment or disability have as smooth experience as possible. That includes, but is not limited to, offering enough metadata for screen readers. The structure of your content requires taking this into account as well and you should make sure you use proper semantic elements. Your pictures should have correct alt attributes, form fields should have label elements attached and so on

Best Practices

This category contains several miscellaneous items, such as utilizing deprecated constructs, HTTP/2, HTTPS, console logging, password field handling and more. One item which I found actually interesting as well as significant is Detection of Javascript libraries with known security vulnerabilities.

Anyone Can Use and Understand It

Analytics software can prove confusing for even the most knowledgeable performance experts. If you can’t comprehend the report, you can’t create the necessary changes. This is tremendously frustrating for website designers, especially if they know their site needs improvement but they can’t figure how why or how to achieve it. The Google Lighthouse audit takes the guesswork out of problems with page performance as well as offers a clear solution.

Author Bio: Nitin Kumar is presently working in one of the best web development companies
located in India. He has vast knowledge in web designing services and presently working in a senior-
most position at JDM web technologies. His outstanding knowledge and hold on this subject has
helped him to reach the position where is standing today. He loves to share his knowledge with
others and so prefers to write blogs and articles related to web design and Web Development
Services and web designing companies India.