PostHog is an open-source product analytics platform. Most teams use it for pageviews — but PostHog ships feature flags, A/B testing, session replay, and surveys in one tool.
The Free APIs You're Missing
1. Feature Flags — Runtime Configuration
Toggle features per user, group, or percentage. Evaluate flags server-side or client-side with automatic analytics.
2. A/B Testing — Built Into Feature Flags
Create multivariate experiments. PostHog tracks which variant converts better automatically.
3. Custom Events — Track Anything
Capture purchase completions, search queries, feature usage — any user action with custom properties.
4. Group Analytics — B2B Product Analytics
Track metrics per company, workspace, or team. Understand how organizations use your product.
5. HogQL — Custom Analytics Queries
Full SQL over your analytics data. Build custom dashboards and reports without data warehouses.
Getting Started
npm install posthog-js
Free tier: 1M events/month, unlimited feature flags.
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