Real-Time Trait Engine

The trait enginefor modern apps.

Predict churn, replies, upgrades, and paywall hits — and trigger the perfect experience. No ML pipelines required.

Works with PostHog, Mixpanel, Segment, or your custom events.

🔒 Trusted by modern teams building intelligent Apps

Portqii
AudienzAI
DelivrAI

Who is Cruxstack for?

Whether you're building apps or scaling sales, we've got the traits you need.

For App Builders & Product Teams

  • Plug in our SDK or connect to tools like MixPanel or Posthog.
  • Get adaptive traits like needs_activation, likely_to_churn, power_user.
  • Deliver smarter onboarding, nudges, and retention flows — without building ML pipelines.
Explore Traits for SaaS Apps

For AI SDR Platforms (Coming Soon)

  • We're working on traits for outbound platforms — like likely_to_reply, optimal_email_time, and needs_nudge.
  • Send events like email_sent, opened, and replied — and get real-time intelligence to optimize outreach.
  • Boost reply and booking rates without managing ML infrastructure.
🔜 Join Waitlist for SDR Traits

Just Drop the SDK.

Install in minutes. Start sending events from day one.

package.json
main.ts
+
VS Code
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import
{ cruxstack} from 'cruxstack-sdk';

export function
handlePageView() {
cruxstack.send("page_view", {
url: "/pricing",
userId: "abc123"
});
}
$
npm install cruxstack-sdk
added 1 package, and audited 1 package in 0.5s
✓ SDK installed successfully

Cruxstack Turns Activity into Intelligence

Cruxstack doesn’t just track — it predicts. Raw events become real-time traits — like likely_to_churn, power_user, and ready_to_upgrade — powered by adaptive ML that evolves with your product, users, and journeys.

🧩 Understands Meaning

Most events are just noise. Cruxstack connects the dots — identifying patterns like drop-off, upgrade readiness, or buying signals across the user journey.

⏳ Predicts Behavior

Built-in models detect traits based on recency, frequency, funnel stage — not just raw activity.

🔁 Adapts on Its Own

Models evolve with usage. No thresholds to tune, no rules to maintain, no ML team needed.

🧬 Example Traits You Can Use Instantly

likely_to_churn•ready_to_upgrade•power_user•disengaged•high_intent

…and many more, Real-time traits that evolve with your users — and grow smarter with every interaction.

Use Traits. Inside Your App.

Query traits via API. Drive personalization, trigger logic, and optimize flows — all in real time.

retention-logic.js
Smart Personalization
// Check user churn likelihood
if (user.traits.likely_to_churn > 0.7) {
showRetentionOffer();
trackEvent('retention_triggered');
}
// Personalize content
if (user.traits.power_user) {
showAdvancedFeatures();
}

Real App Impact

Traits drive intelligent user experiences

Smart Retention

User at 73% churn risk → Instant retention offer displayed

Retention offer triggered!
Power User Experience

Advanced features unlocked for high-engagement users

Contextual Messaging

ICP fit determines onboarding flow and messaging tone

47%
Higher Retention
3.2x
Better Conversion

Simple, usage-based pricing.

Get started for free. Scale as you grow.

We're still finalizing plans — but you'll only pay based on usage, and the Starter tier will always be free.

Request Early Access
Request Early Access

Be the First to Experience
Real-Time User Intelligence

Join thousands of developers waiting for early access to Cruxstack. Get notified when we launch and receive exclusive early-bird pricing.