The problem: if you have an app and a website, the same person shows up as 2-4 different "users" in your analytics. Your user counts are inflated, your funnels are broken, and you're retargeting people who already converted.
I built SDKs (Web, Android, iOS) that handle this server-side. The bit I'm most proud of is a WebView bridge — when someone opens a link in your app's in-app browser, the SDKs silently link the sessions without needing a login.
Live demo: https://crosstrack-demo.onrender.com
Is this a problem you've actually hit? Curious what you'd need to try something like this.
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