CLS Checker - Journey Further
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Item media 1 screenshot
Item media 2 screenshot
Item media 1 screenshot
Item media 1 screenshot
Item media 2 screenshot


Test and debug cumulative layout shifts (CLS) in the browser

This tool measures the 'cumulative layout shifts' that occur when a page is loaded in the browser using data from the Chrome Performance API. These are then listed showing the 'layout shift' score and visualised on the webpage. Green squares show where the element started and red indicates where the element was shifted to.

5 out of 510 ratings

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Antoine Le LouëtJan 31, 2023

Do the job ! Thanks

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서교욱Dec 21, 2022

This a very useful program that saves time. If there's a mobile version, it'll be perfect

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Rife InteractiveApr 1, 2022

FANTASTIC tool - great job guys, thank you so much


  • Version
  • Updated
    April 22, 2021
  • Offered by
    Journey Further
  • Size
  • Languages
    English (UK)
  • Developer
  • Non-trader
    This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.


The developer has disclosed that it will not collect or use your data.

This developer declares that your data is

  • Not being sold to third parties, outside of the approved use cases
  • Not being used or transferred for purposes that are unrelated to the item's core functionality
  • Not being used or transferred to determine creditworthiness or for lending purposes


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