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Welcome to Cruxstack

Predict what users will do next — and personalize their experience — without writing a single ML model.
Cruxstack is a plug-and-play User Intelligence Infrastructure (UII) that turns raw user activity into real-time behavioral traits — like likely_to_churn, ready_to_upgrade, and power_user.
Know your users better with our drop-in SDKs and adaptive, self-tuning trait engine.

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Node.js SDK

Stream backend events with auto-queueing, retries, and TypeScript support. Built for production-grade reliability in Express, Fastify, and Koa apps.

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Browser SDK

Track front-end user behavior in real-time — no setup needed. Works with React, Vue, Angular, and plain JavaScript.

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Why Cruxstack?

  • Real-time personalization: Stream behavioral traits like likely_to_churn and power_user in milliseconds.
  • No ML expertise required: Use adaptive, self-tuning traits out of the box — no models to train.
  • Drop-in SDKs: Track behavior across web, mobile, and server apps with our unified SDKs.
  • Enterprise-grade reliability: Queueing, retries, and observability built in from day one.
  • Built for scale: Proven performance across production environments — from fast startups to large-scale systems.