Case Study — Healthcare Forms Platform

Migrated 906K events from Mixpanel to PostHog. Cut analytics costs 90%. Stayed HIPAA compliant.

A HIPAA-compliant healthcare forms platform needed to move their entire analytics stack without losing data or breaking compliance.

906K

Historical events audited

90%

Analytics cost reduction

Data loss during migration

228

Event types reviewed and mapped

Before.

A healthcare forms platform with ~2,700 customers had been collecting analytics in Mixpanel since 2021 — 4 years of behavioral data across 906K events and 228 event types. The data existed. But it wasn't answering the questions that mattered.

Mixpanel's enterprise pricing meant $20K–$50K/year for analytics the team didn't fully trust. Event naming was inconsistent. Properties were missing. Some events contained potential PHI that had never been flagged. The platform needed to migrate — but in healthcare, there's zero tolerance for compliance mistakes.

The team also had a new product launching simultaneously. They needed analytics running on both platforms at once — with no interruption to data collection.

The Situation

4 years of analytics data locked in Mixpanel at $20K–$50K/year
228 event types — inconsistent naming, missing properties, redundant events
4 events containing potential PHI that couldn't be migrated as-is
170+ SDK calls needing conversion across two products simultaneously

What we did.

A systematic migration strategy: audit the existing data, assess compliance risk, map every SDK call, and execute with zero data loss.

Step 1 — Audit

Full Mixpanel dataset audit: 906K events, 228 event types, volume analysis from November 2021 to present. Identified the top 10 events by volume, flagged low-value legacy events, and assessed overall schema quality.

Step 2 — HIPAA Risk Assessment

Reviewed every event type for PHI exposure. Identified 4 events containing patient identifiers that could not be migrated. Built exclusion rules and documented safe-to-migrate categories. The migration preserves behavioral data while removing compliance risk entirely.

Step 3 — SDK Mapping

Method-by-method comparison across 17 Mixpanel SDK methods. 12 methods had direct 1:1 PostHog equivalents — 70% of the conversion could be automated. The remaining 5 methods required manual review for custom logic or different signatures.

Step 4 — Migration Strategy

Evaluated 4 migration paths ranked by reliability, cost, and control. Recommended PostHog's managed migration — no coding required, automatic schema transformation, and zero ingestion fees for historical data. Built a 6-week implementation timeline with phase gates and QA checkpoints.

Step 5 — Cost Analysis

Mapped current and projected analytics costs across growth scenarios. At their current volume (~19K events/month), the platform stays in PostHog's free tier. Even at 2M events/month, costs would be ~$50/month. BAA and group analytics included at standard pricing — no “healthcare tax.”

Step 6 — Implementation Support

Developer handoff with code conversion examples for every SDK method. Created implementation priorities, QA checklists, and a two-product cutover plan so analytics ran on both the legacy app and new platform simultaneously. Zero downtime during the transition.

After.

90%

Reduction in annual analytics cost — from $20K–$50K/year to effectively $0

906K

Historical events preserved with full schema transformation — zero data loss

70%

Of SDK conversion automated via 1:1 method mapping across 17 API methods

210

Safe event types identified for migration (18 HIPAA-risk events excluded)

6 weeks

End-to-end migration timeline including QA and cutover

Migration cost — PostHog managed migration is free with no extraction charges

What you can do now.

Your analytics infrastructure costs a fraction of what it did — $0–$50/month instead of $20K–$50K/year — while including BAA, group analytics, and session replay at standard pricing. No more “healthcare tax.”

Your compliance team knows exactly which events are safe and which were excluded. Every migration decision is documented. PHI-risk events identified and removed before any data moved. Auditable from day one.

Your engineering team has a clear SDK conversion guide with code examples for every method type — and a QA checklist that catches property gaps before they become 3 months of lost segmentation data.

See PostHog Setup Offers → Book a 15-Minute Call

Migrated 906K events from Mixpanel to PostHog. Cut analytics costs 90%. Stayed HIPAA compliant.

Before.

What we did.

After.

What you can do now.

Considering a PostHog migration?