How we score tools →

PostHog is an open-source product analytics platform covering product analytics, session replay, feature flags, and A/B testing in one tool. UK startups can self-host it for full data control — appealing given GDPR and UK data-residency rules — or use the cloud version with EU hosting. The free tier includes 1 million events/month. Paid plans scale from $0 as you grow. It's developer-friendly with SDKs for every major framework. PostHog rivals Mixpanel and Amplitude for product analytics, adds session replay like Hotjar, and keeps everything under one roof — a favourite of technical UK founding teams.