PostHog vs Google Analytics 4
Who This Page Is For
You’re comparing these tools because you need analytics and you’re deciding between:
- Product analytics (PostHog: user behavior, funnels, retention) vs Marketing analytics (GA4: traffic, attribution, ads)
- Self-hosting option (PostHog) vs Free cloud-only (GA4)
- Privacy-first (PostHog) vs Google ecosystem (GA4)
These tools solve different problems. Many teams use both.
The Core Tradeoff
PostHog is for product analytics — understanding user behavior in your app. Funnels, retention, cohorts, session recordings, feature flags. Self-hosting available. Cookie-free option.
GA4 is for marketing analytics — understanding traffic sources, conversions, and attribution. Free. Integrates with Google Ads. Requires cookies.
The decision: Product behavior (PostHog) or marketing attribution (GA4)? Many teams need both.
Quick Decision
Choose PostHog when:
- You need product analytics (user behavior, funnels, retention)
- Session recordings are important
- Feature flags and A/B testing are needed
- Self-hosting for data ownership is required
- Privacy-first without Google data sharing matters
Choose GA4 when:
- Marketing attribution is the primary need
- Google Ads integration is essential
- Traffic sources and conversion tracking matter
- Free unlimited analytics is the requirement
- Google ecosystem integration is important
Use both when:
- You need marketing attribution AND product analytics
- GA4 for traffic, PostHog for user behavior
- Different teams have different needs
Comparison Snapshot
| Area | PostHog | Google Analytics 4 |
|---|---|---|
| Starting Price | $0/mo | $0/mo |
| Free Limits | 1M events (cloud) | Unlimited |
| Primary Focus | Product analytics | Marketing analytics |
| Self-Hosting | Yes | No |
| Session Recordings | Yes | No |
| Feature Flags | Yes | No |
| Marketing Attribution | Limited | Full multi-touch |
| Google Ads Integration | No | Native |
| Cookie-free Option | Yes | No |
The “What Are You Trying to Learn” Question
PostHog answers:
- How do users behave in my product?
- Where do users drop off in my onboarding flow?
- Which features do users engage with?
- What do sessions look like for churned users?
GA4 answers:
- Where does my traffic come from?
- Which marketing channels convert best?
- How does my Google Ads spending perform?
- What’s my attribution model showing?
Different questions = different tools.
Detailed Comparison
Product Analytics
PostHog: Full product analytics — funnels, retention, cohorts, user paths, feature adoption. Deep behavioral analysis.
GA4: Basic event tracking. No true product analytics depth. Designed for marketing, not product.
Bottom line: PostHog for product teams. GA4 doesn’t compete here.
Marketing Attribution
PostHog: Limited attribution capabilities. Not designed for marketing analytics.
GA4: Full multi-touch attribution. Native Google Ads integration. Conversion tracking. Campaign analysis.
Bottom line: GA4 for marketing teams. PostHog doesn’t compete here.
Session Recordings
PostHog: Full session recordings. Watch user sessions, see where they click, debug issues.
GA4: No session recordings at all.
Bottom line: If session recordings matter, PostHog includes them. GA4 requires a separate tool.
Self-Hosting and Privacy
PostHog: Full self-hosting. Complete data ownership. Cookie-free tracking available. No Google data sharing.
GA4: Cloud-only. Data sent to Google. Requires cookies. Google uses data for their purposes.
Bottom line: Privacy-first? PostHog. Google ecosystem? GA4.
Pricing
PostHog: Free tier (1M events cloud). Self-hosted is unlimited free. Usage-based at scale.
GA4: Completely free. No limits. (Because Google monetizes the data.)
Bottom line: GA4 is more free. PostHog’s self-hosted is unlimited but requires infrastructure.
Why Many Teams Use Both
| Use Case | Tool |
|---|---|
| Traffic analysis | GA4 |
| Google Ads optimization | GA4 |
| User behavior analysis | PostHog |
| Feature adoption tracking | PostHog |
| Conversion attribution | GA4 |
| Session recordings | PostHog |
| Feature flags | PostHog |
They’re complementary, not competitors.
Honest Limitations
PostHog Limitations
- Limited marketing attribution
- No Google Ads integration
- Free tier has event limits (cloud)
- More technical setup than GA4
GA4 Limitations
- No product analytics depth
- No session recordings
- No feature flags
- Data sent to Google
- Requires cookies
Frequently Asked Questions
Which is better for product analytics?
PostHog. It’s designed for product teams with funnels, retention, cohorts, and user behavior. GA4 is for marketing.
Which is better for marketing?
GA4. Native Google Ads integration, attribution modeling, campaign tracking. PostHog doesn’t focus on marketing.
Can I use both?
Yes, many teams do. GA4 for traffic and attribution, PostHog for product behavior. Different purposes.
Which supports self-hosting?
PostHog only. GA4 is exclusively Google-hosted.
Does GA4 have session recordings?
No. PostHog includes session recordings. GA4 requires a separate tool like Hotjar.
Which is more free?
GA4 is completely free with no limits. PostHog cloud has a 1M event free tier. Self-hosted PostHog is unlimited but requires infrastructure.
Which is better for privacy?
PostHog. Self-hosting keeps data on your infrastructure. Cookie-free tracking available. GA4 sends data to Google.
Bottom Line
| Your Situation | Choose |
|---|---|
| Product analytics (user behavior) | PostHog |
| Marketing analytics (attribution) | GA4 |
| Google Ads integration | GA4 |
| Session recordings | PostHog |
| Feature flags | PostHog |
| Self-hosting | PostHog |
| Privacy-first | PostHog |
| Free unlimited analytics | GA4 |
| Both needs | Use both |
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