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WebPagetest VS CSS Scan

Compare WebPagetest VS CSS Scan and see what are their differences

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WebPagetest logo WebPagetest

Run a free website speed test from multiple locations around the globe using real browsers...

CSS Scan logo CSS Scan

Instantly check or copy computed CSS from any element for only ~95$
  • WebPagetest Landing page
    Landing page //
    2023-07-05
  • CSS Scan Landing page
    Landing page //
    2023-07-14

WebPagetest features and specs

  • Detailed Performance Metrics
    WebPagetest provides extensive performance metrics, including Time to First Byte (TTFB), Speed Index, and First Contentful Paint, allowing for a deep understanding of website performance.
  • Real Browsers
    Tests are conducted using real browsers, which ensures that the results are closely aligned with real user experiences.
  • Geolocation Testing
    Supports testing from various locations worldwide, which is useful for understanding performance in different markets.
  • Advanced Testing Options
    Offers advanced options such as scripting for complex interactions, multi-step transactions, and authenticating users.
  • Free and Open Source
    WebPagetest is free to use and its code is open-source, allowing for community contributions and customizable implementations.
  • Video Capture
    Provides video capture of the loading process, giving a visual representation of loading performance.
  • Waterfall Charts
    Generates detailed waterfall charts that help identify bottlenecks in resource loading.

Possible disadvantages of WebPagetest

  • Complexity for Beginners
    The extensive options and detailed metrics may be overwhelming for beginners who are not familiar with web performance testing.
  • Intermittent Performance
    As a free service, sometimes the performance can be inconsistent due to high demand or limited resources.
  • Dated Interface
    The user interface of the website is somewhat dated and could benefit from modernization to improve user experience.
  • Limited Instant Support
    Lack of immediate support options can be a downside; users often have to rely on forums and community support.
  • Potential for Inconsistent Results
    Results might vary between tests due to variability in internet speed, server conditions, and other external factors.
  • Configuration Overhead
    Advanced testing options require a significant amount of configuration, which can be time-consuming.

CSS Scan features and specs

  • Ease of Use
    CSS Scan offers an intuitive and user-friendly interface, making it easy for developers of all skill levels to inspect and copy CSS styles directly from the browser.
  • Time-Saving
    It significantly reduces the time needed to debug and replicate styles by allowing quick copying of well-structured CSS rules from any element on the page.
  • Accuracy
    The tool ensures that the copied CSS maintains the exact styling, including computed styles and vendor prefixes, providing high accuracy in replication.
  • Live Edits
    CSS Scan enables live editing of styles, allowing developers to make real-time changes and see the results instantly, which is beneficial for testing and adjustments.
  • Visual Representation
    The extension visually displays how CSS rules are applied, making it easier to understand complex styling hierarchies and cascades.

Possible disadvantages of CSS Scan

  • Cost
    CSS Scan is a paid tool, so there is a financial investment required, which might not be feasible for all developers, especially those working on personal or non-commercial projects.
  • Browser Compatibility
    As a browser extension, its functionality may be limited to supported browsers, potentially excluding users of less common or unsupported browsers.
  • Limited Scope
    While CSS Scan is powerful for copying and analyzing CSS, it does not offer features for editing or managing CSS files directly, requiring another tool or manual intervention for those tasks.
  • Dependency
    Relying on a third-party tool can be a downside if the tool experiences downtime, changes its pricing, or ceases development, leaving users in a difficult position.
  • Privacy Concerns
    Using browser extensions can raise privacy concerns, as they typically have access to the pages you visit; ensuring the trustworthiness of the extension is crucial.

WebPagetest videos

+ Add

WebPageTest - The State of the Web

More videos:

  • Tutorial - How To Use WebPageTest.org - For Beginners

CSS Scan videos

+ Add

Chrome CSS Viewer CSS Scan 2.0 - All Your CSS Secrets Revealed

More videos:

  • Review - CSS Scan and Microthemer are buddies

Category Popularity

0-100% (relative to WebPagetest and CSS Scan)

WebPagetest

CSS Scan

Website Monitoring
100 100%
Website Monitoring
0% 0
Developer Tools
0 0%
Developer Tools
100% 100
Performance Monitoring
100 100%
Performance Monitoring
0% 0
Design Tools
0 0%
Design Tools
100% 100

User comments

Share your experience with using WebPagetest and CSS Scan. For example, how are they different and which one is better?
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Social recommendations and mentions

Based on our record, WebPagetest should be more popular than CSS Scan. It has been mentiond 51 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

WebPagetest mentions (51)

  • A PageSpeed insight report, but for every page in your domain
    Trust neither. The most optimal option I've found is webpagetest.org Its been quite handy lately. This tool does look interesting. Source: about 2 years ago
  • How are you all accurately checking your website load time? Not sure PageSpeedInsights is very helpful.
    Webpagetest.org is another. Pagespeedinsights and lighthouse are great for identifying page load issues to fix, but actual page load times will always vary between the user and your web server. Universal analytics has some page load timings but that's going away soon and nothing afaik is in GA4. I've seen an example of building a page load timer in tag manager and dumping the results into an event. Source: about 2 years ago
  • Extreme confusing over Speed Index results -- webpagetest.org
    So I am working on rebuilding our company's site with a new stack. I am running tests using webpagetest.org, and I am having trouble fully understanding the speed index results as well as the film strip view. The page renders quite fast everywhere I test it. Google Lighthouse shows it in the 90s + for performance score, however when I test the page on webpagetest, I get load times of 77 seconds (NOT MS) which is... Source: about 2 years ago
  • Does anyone else experience pure ecstasy when they get 100 on Lighthouse? 😩
    Webpagetest.org is great, and checking OP's site they have done an incredible job, I don't think I have ever made or seen an Ecom site this slick. Super clean waterfall view. Source: about 2 years ago
  • Performance scores for Google Lighthouse/Insights seem to be very inaccurate
    Thanks for the recommendation regarding webpagetest.org, another user made a similar recommendation so I will check it out. Source: over 2 years ago
View more

CSS Scan mentions (13)

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What are some alternatives?

When comparing WebPagetest and CSS Scan, you can also consider the following products

GTmetrix - GTmetrix is a free tool that analyzes your page's speed performance. Using PageSpeed and YSlow, GTmetrix generates scores for your pages and offers actionable recommendations on how to fix them.

CSS Scan Pro - The easiest way to get and edit the CSS of any website, live

PageSpeed Insights - PageSpeed is addon for ...

Hoverify - All-in-one browser extension to improve your web dev experience.

Google Lighthouse - Lighthouse is an open-source, automated tool for improving the quality of web pages.

CSS Peeper - Smart CSS viewer tailored for Designers.

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