PostHog

Platform

Open-source product analytics with session replay, feature flags and A/B tests

Price: Free tier, then paid
Access: Project token

About

Product analytics suite that also covers session replay, feature flags, experiments, surveys and error tracking, with SDKs for web, mobile and backend. PostHog Cloud runs in the US or EU; the MIT-licensed self-hosted version is officially unsupported.

What you can do with it

Track events and analyze funnels, retention and user paths
Record and replay user sessions to debug UX issues
Use feature flags, web analytics, surveys and error tracking in your app

Get started

Create a PostHog Cloud project in the US or EU region
Copy the project token from the project settings

Example

# EU Cloud uses https://eu.i.posthog.com
curl -L https://us.i.posthog.com/i/v0/e/ \
  -H "Content-Type: application/json" \
  -d '{"api_key":"'"$POSTHOG_PROJECT_TOKEN"'","event":"signed_up",
       "distinct_id":"user-123","properties":{"account_type":"pro"}}'

Details

Hosting: Hosted service, Self-hosted
Available in: Worldwide
Official SDKs: JavaScript/TypeScript, Python, Go, Java, Ruby, PHP, C#, Swift, Kotlin, Dart, Elixir, Rust
MCP server: Remote