PostHog

PostHog is an open source product analytics platform that combines multiple tools into one - product analytics, session recording, feature flags, experimentation, and more. It's designed for product engineers to get insights and iterate quickly without needing to rely on data teams.

Key features include:

• Product analytics with event tracking, funnels, retention analysis etc.
• Session recording to see how users interact with your product
• Feature flags for controlled rollouts and A/B testing
• Experimentation tools for running A/B tests
• User surveys for gathering feedback
• Web analytics for basic site metrics
• Open source with self-hosting options for full data control

PostHog aims to provide a comprehensive toolkit for product teams to understand user behavior, test new features, and improve products rapidly. The platform is built API-first, giving developers flexibility to access data and integrate PostHog into their workflows.

With a generous free tier and transparent pricing, PostHog is popular among startups and growing companies looking for powerful analytics without a huge price tag. The open source nature also appeals to companies that want full control over their data.