PostHog
All-in-one product analytics, session replay, feature flags, and A/B testing
Overview
PostHog is an all-in-one product analytics platform combining event-based product analytics, web analytics, session replay, feature flags, surveys, and experiments. It is the most complete open-source alternative to Mixpanel and Amplitude, with a generous open-source self-hosted option and a hosted cloud. Built on ClickHouse for fast analytical queries over large event volumes.
Key features
- Event-based product analytics with funnels, retention, and trend analysis
- Session replay to watch real user interactions
- Feature flags and A/B testing (experiments)
- Surveys and web analytics in the same install
- Built on ClickHouse for fast queries over large event volumes
- S3-style hosted cloud option alongside self-hosting
Our take
PostHog is the most feature-complete open-source answer to Mixpanel and Amplitude, folding product analytics, session replay, feature flags, surveys, and A/B testing into a single platform backed by ClickHouse for genuinely fast queries at scale. The breadth is the selling point: you replace several paid SaaS tools with one install. The catch is operational weight — this is a 5/5 difficulty deploy, and running ClickHouse plus the rest of the stack in production is a real commitment in resources and maintenance. PostHog has also been candid that the self-hosted edition is less of a focus than their cloud, so smaller teams should weigh the managed option before signing up to operate it themselves.
Ideal for: Product and growth teams that want analytics, replay, and experimentation in one stack without stitching together Mixpanel, Hotjar, and a flagging service.
Where it falls short of Mixpanel
- Self-hosting the full ClickHouse + Kafka + Postgres + Redis stack is heavy; the project actively steers smaller users toward PostHog Cloud.
- Some enterprise features live under a separate proprietary
eelicense, not pure MIT. - The all-in-one breadth means it is more complex to operate than a focused tool like Mixpanel.
We list the gaps honestly so you can decide if the trade-off is worth owning your data.
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