PostHog combines product analytics, session replay, feature flags, and experimentation in one tool. Open source, self-hostable in the EU region, and usable as an assignment layer for server-side experiments.
What is PostHog?
PostHog is an all-in-one platform for product data. Instead of running four tools for funnels, session replay, feature flags, and experiments, everything sits in one place, on a shared event base. The big advantage for EU setups: it's self-hostable, so the data stays in your region and control.
For experimentation, the flag engine is especially relevant. It works as an assignment layer for server-side tests, assigning variants on the server instead of in the browser.
When PostHog fits, and when it doesn't
A fit when:
- you want product funnels, flags, and experiments from one source
- the data should sit self-hosted in the EU
- a product or growth team works with events
- server-side experimentation needs an assignment layer
Less so when:
- pure web analytics is enough
- nobody operates and maintains the tool
- there's no product with meaningful user behaviour
PostHog in the stack
PostHog doesn't replace the warehouse; it supplies the product-behaviour layer above it:
| Function | Role |
|---|---|
| Product analytics | funnels, retention, paths |
| Session replay | qualitative behaviour |
| Feature flags | rollouts and assignment |
| Experimentation | A/B and server-side tests |
The events can also be mirrored into the BigQuery warehouse, where they join the marketing data.
What Datascale builds with PostHog
We set PostHog up and connect it to your experimentation infrastructure:
- self-hosted setup in the EU region
- event design for product analytics
- feature-flag and experiment configuration
- edge or middleware assignment for server-side tests
- an exposure pipeline for clean analysis
- connection of the events to the warehouse
The full picture lives in CRO & Journey Intelligence. For server-side experimentation we build the assignment and exposure layer. The variant itself, the design and copy, stays with your team.
