PostHog vs Google Analytics 4
PostHog and Google Analytics 4 are both analytics platforms, but they serve different primary use cases. This comparison focuses on practical differences without recommending one over the other.
Overview
PostHog is an open-source product analytics platform with self-hosting and privacy focus. Google Analytics 4 is a free web analytics platform optimized for marketing attribution and Google Ads integration.
Feature Comparison
| Feature | PostHog | Google Analytics 4 |
|---|---|---|
| Starting Price | $0/month | $0/month |
| Self-Hosting | Yes | No |
| Open Source | Yes | No |
| Session Recordings | Yes | No |
| Feature Flags | Yes | No |
| Marketing Attribution | Limited | Yes |
| Google Ads Integration | No | Yes |
| Cookie-free Option | Yes | No |
| Event Tracking | Custom events | Event-based model |
Key Differences
Primary Focus
PostHog is designed for product analytics—tracking user behavior within applications. GA4 is designed for web analytics—tracking traffic, conversions, and marketing attribution.
Privacy and Data Control
PostHog offers self-hosting for complete data ownership and can run without cookies. GA4 sends data to Google servers and requires cookies for full functionality.
Feature Bundling
PostHog includes session recordings, feature flags, and A/B testing. GA4 focuses on analytics and integrates with Google’s broader marketing ecosystem.
Marketing Integration
GA4 integrates natively with Google Ads, Search Console, and Google Marketing Platform. PostHog focuses on product analytics without marketing tool integration.
Technical Specifications
| Specification | PostHog | Google Analytics 4 |
|---|---|---|
| Deployment | Self-hosted or Cloud | Cloud only (Google) |
| Open Source | Yes | No |
| Data Ownership | Full (self-hosted) | Google-hosted |
| Cookie-free Tracking | Yes | No |
| Session Replay | Yes | No |
| Feature Flags | Yes | No |
| Attribution Modeling | Limited | Multi-touch |
| BigQuery Export | Yes | Free |
| Real-time | Yes | Yes |
Data Handling
PostHog
- Self-hosted: Complete data ownership on your infrastructure
- Cloud: EU or US hosting with data processing agreements
- Cookie-free tracking options for privacy compliance
- Full database access with self-hosting
Google Analytics 4
- Data hosted on Google infrastructure
- Data shared with Google for service improvement
- BigQuery export available for raw data access
- Subject to Google’s privacy policies and data practices
Use-Case Fit
- Product analytics: PostHog provides deeper product behavior insights
- Marketing analytics: GA4 excels at traffic and conversion attribution
- Privacy requirements: PostHog self-hosting avoids third-party data sharing
- Google Ads users: GA4 is essential for Ads optimization
- Session recordings: PostHog includes recordings; GA4 does not
- Budget constraints: Both are free; GA4 is fully free, PostHog free tier has limits
Frequently Asked Questions
Which is better for product analytics?
PostHog is designed for product analytics with user behavior, funnels, and retention. GA4 is better for traffic and marketing analytics.
Which supports self-hosting?
PostHog is fully open-source and supports self-hosting. GA4 is exclusively hosted by Google.
Which is better for privacy compliance?
PostHog self-hosting keeps data on your infrastructure without third-party sharing. GA4 sends data to Google.
Does GA4 include session recordings?
No, Google Analytics 4 does not include session recordings. PostHog includes session replay functionality.
Can I use both together?
Yes, many teams use GA4 for marketing attribution and PostHog for product analytics. They serve different purposes.
Which integrates with Google Ads?
Google Analytics 4 integrates natively with Google Ads for conversion tracking and audience building. PostHog does not integrate with Google Ads.
Which has better free tier?
GA4 is completely free with no usage limits. PostHog’s free tier has event limits but includes more features like session recordings.