PostHog is an open-source, all-in-one developer platform founded in 2020, designed to help engineering and product teams build successful products. The platform has expanded from a single product analytics tool into a suite of 14+ products including session replay, feature flags, A/B testing, error tracking, LLM observability, a built-in data warehouse, a CDP, and an AI assistant called Max AI. PostHog differentiates on open-source transparency, privacy-friendly self-hosting options, generous free tiers, and a developer-centric culture with no outbound sales. The company achieved unicorn status in September 2025 at a $1.4B valuation.

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