Can GA4 and Mixpanel be used together?
Yes, and many mature product companies do exactly this. GA4 handles marketing attribution and Google Ads integration; Mixpanel handles product analytics and retention work. The overlap is in basic funnel analysis, where teams typically pick one tool and enforce consistency. Running both for the same function creates data discrepancy debates and reporting confusion.
Why do GA4 and Mixpanel show different user counts?
Different identity models. GA4 defaults to a device-based model with probabilistic cross-device stitching in GA4's own graph; Mixpanel uses explicit user IDs you send via the identify() call. If you have users who switch devices or clear cookies, each tool counts them differently. Mixpanel's user counts are generally more accurate once you instrument proper user identification.
Does Mixpanel replace Google Analytics entirely?
Not without gaps. Mixpanel does not replace GA4's native Google Ads attribution, Search Console integration, or the Looker Studio report ecosystem that many marketing teams depend on. It replaces GA4 for product-side analysis. Organizations that fully migrate from GA4 to Mixpanel typically add a separate attribution tool (Amplitude, PostHog, or a CDP) to fill the marketing analytics gap.
Which platform handles mobile apps better?
Both support mobile apps via SDKs, but with different strengths. GA4's Firebase integration makes it the default for apps already in the Firebase ecosystem. Mixpanel's flexible event model and cross-platform user identification are often better suited for consumer apps where product behavior analysis matters more than campaign attribution.