PostHog ranks #3 in Developer Analytics & Product Analytics AI search.

PostHog is an open-source, all-in-one developer analytics platform founded in January 2020 and headquartered in San Francisco. Built for product engineers, it combines product analytics, web analytics, session replay, feature flags, A/B experimentation, error tracking, surveys, LLM observability, and a built-in data warehouse into a single 'Product OS.' The platform is available as a managed cloud service in US and EU regions or as a self-hosted deployment under an MIT license, giving teams full ownership of their customer data. Pricing is usage-based with a generous free tier; 98% of its 190,000+ customer teams use it at no cost. Backed by Stripe, GV, Y Combinator, and Peak XV Partners, PostHog reached a $1.4 billion valuation in September 2025 and has accumulated over 33,800 GitHub stars, growing largely through developer word-of-mouth.