Microsoft Clarity is the more common of the two in our index: it runs on 11,468 websites against 826 for Quantcast Measure, and 127 sites use both. Counts come from real scans of each site's home page, not vendor claims, and cover the sites in TechLookup's index rather than the whole web.
Microsoft's Clarity is a analytics tool which provides website usage statistics, session recording, and heatmaps.
Quantcast Measure is an audience insights and analytics tool.
Within the analytics sites we have indexed, Microsoft Clarity holds 14% and Quantcast Measure 1.0%.
127 sites run both Microsoft Clarity and Quantcast Measure. That is 15% of the sites using Quantcast Measure, the smaller of the two.
Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.