Optimizely Feature Experimentation vs. PostHog

Optimizely Feature Experimentation is a full-stack experimentation and feature management platform built for product, engineering, and data teams. Run A/B and multivariate tests across web, mobile, and server-side environments from a single SDK. Feature flags, audience targeting, and real-time results all come built in. The Stats Engine supports multiple statistical methods, including sequential testing, Bayesian, and frequentist (fixed horizon), so teams can choose the approach that fits their traffic, goals, and decision-making style.

PostHog is the open-source, all-in-one platform that helps engineers build better products. We enable software teams to capture events, perform analytics, record user sessions, conduct experiments and deploy new features, all in one platform. - DESIGN BETTER: Robust product analytics. Multivariate A/B experiments. User segmentation and 50+ integrations. PostHog has everything you need to build better products. - BUILD BETTER: Roll out new features safely with feature flags, debug issues with session recordings and plan new features with correlation analysis -- all in PostHog.