{"data":{"slug":"posthog","name":"PostHog","tagline":"Product analytics, flags, replay, and errors in one MIT-core stack","category":"observability","categoryName":"Observability","url":"https://posthog.com","github":"https://github.com/PostHog/posthog","pricing":"freemium","hook":"PostHog is the product OS we actually run. Open-core; Cloud is the free path that matches the bar.","whatsGood":"MIT for everything outside ee/. Cloud README states the first 1 million events, 5k recordings, 1M flag requests, 100k exceptions, and 1500 survey responses are free every month, then usage-based. Same product self-hosted if you want the bill to be your cluster. EU Cloud exists. This is analytics plus flags, replay, surveys, and error tracking — not a page-view pixel.","theCatch":"ee/ is a separate proprietary license. posthog-foss strips it if you need a clean MIT tree. Self-hosting is a Postgres + ClickHouse ops job. Cloud is usage-metered after the free allowances; replay is usually the line that bites first.","verdict":"The honest Mixpanel/Amplitude alternative. MIT core, real free Cloud, ee/ is not MIT.","addedAt":"2026-09-03","featured":false,"domain":"Observability","subSpecialty":"Product Analytics","capabilities":["analytics","flags"],"surfaces":["Self-host","Hosted"],"ecosystem":["Multi-platform"],"licenseModel":"Freemium","githubStars":39578},"related":[{"slug":"sentry","name":"Sentry","tagline":"Error tracking that actually helps"},{"slug":"grafana","name":"Grafana","tagline":"Dashboards for everything observable"},{"slug":"prometheus","name":"Prometheus","tagline":"Time-series metrics for cloud-native"},{"slug":"opentelemetry","name":"OpenTelemetry","tagline":"Vendor-neutral observability framework"},{"slug":"datadog","name":"Datadog","tagline":"Unified observability platform"}],"links":{"self":"/api/gems/posthog","html":"/gems/posthog","markdown":"/gems/posthog.md","category":"/api/gems?category=observability","categoryPage":"/stacks/observability"}}