Core Web Vitals Test: LCP, CLS and TBT on Mobile and Desktop
Quarrywise
Test one page in the lab on a mid-range phone and a desktop and get LCP, CLS and TBT as the median of 3 runs, with the lowest and highest value. Lab data (TBT stands in for INP), not what your real visitors see.
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Output fields
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The final output is delivered in JSON, CSV, or Excel format, ready to be plugged into your workflow. You can also run the "Core Web Vitals Test: LCP, CLS and TBT on Mobile and Desktop" task via API.

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