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CrossTrack – Cross-platform identity resolution as a service

CrossTrack – Cross-platform identity resolution as a service

by jamespeng·Apr 17, 2026·2 points·0 comments
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AI Analysis

●●SolidBig BrainSolve My ProblemNiche Gem

WebView localStorage bridge links app and web sessions without login.

Strengths
  • •WebView bridge injects device ID into localStorage for deterministic anonymous linking.
  • •Step-by-step demo visualizes the identity graph merging process clearly.
  • •Server-side merging handles SDK events without requiring immediate user authentication.
Weaknesses
  • •Identity resolution is a high-trust category; hard to adopt a new startup for core data.
  • •Competes with entrenched players like Segment and RudderStack who have broader ecosystems.
Category
Data
Target Audience

Growth engineers, analytics teams, mobile developers with companion web apps

Similar To

Segment · RudderStack · mParticle

Post Description

Hey HN, I built a service that merges user identity across websites, mobile apps, and in-app WebViews into one profile.

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.

https://crosstrackdata.com

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