Cloud//PostHog

Product analytics and feature flags. External API — a JS snippet or SDK in your app sends events (page views, clicks, feature usage) to PostHog's servers via HTTP.

Product analytics and feature flags. External API — a JS snippet or SDK in your app sends events (page views, clicks, feature usage) to PostHog's servers via HTTP.

Event-based analytics: track any user action, build funnels, cohorts, retention charts

Feature flags: roll out features to a percentage of users, A/B test, kill switch

Session replay: record user sessions for debugging UX issues

Open-source and self-hostable — but the hosted version is the common path

Your app sends data out; PostHog processes it. Nothing runs inside your server.