PostHog is the open-source product-analytics platform founded in 2020 by James Hawkins and Tim Glaser in London, a Y Combinator Winter 2020 batch alumnus that built one of the most successful B2B-software launches on Hacker News since 2012. The product combines product analytics, session replay, feature flags, A/B testing, surveys, heatmaps, data warehouse, and customer data infrastructure into a single integrated platform; PostHog reports that 98% of customers use the free tier and operates entirely on usage-based pricing ($0.00005 per event for analytics, $0.005 per session-replay recording).
For an EU-sovereignty audit PostHog falls into the eu_hq_us_funded ownership tier. The HQ is London (UK post-Brexit jurisdiction with EU adequacy decision), but the cap table is heavily US-VC: Y Combinator (the canonical Silicon Valley accelerator) led the initial investment and GV (Google Ventures) led the $12M Series A; notable angels include Jason Warner (former GitHub CTO), Solomon Hykes (Docker founder), and David Cramer (Sentry founder). For the managed cloud, customers pick between US (Virginia) and EU (Frankfurt) hosting regions at signup; EU-region customers get GDPR-aligned residency, but the vendor's UK jurisdiction + US-VC ownership + AWS Frankfurt hosting (under PostHog's parent entity) keep the CLOUD Act flag at material under the strict-ownership stance.
The self-host edition is the procurement-grade path for EU buyers. PostHog publishes the full server-side stack as open source on GitHub under a source-available licence; running it on Hetzner / OVHcloud / Scaleway / STACKIT / private DC delivers full sovereignty by construction. Pricing: free tier (extremely generous, most customers stay on free); usage-based above for both cloud and self-host commercial deployments. Best fit: product teams that want an Amplitude / Mixpanel / Heap replacement with permissive self-host option and don't require an EU-incorporated vendor entity.