GA4 vs PostHog (2026): Which Should You Choose?
Quick Answer
GA4 is the default for marketing teams — free, powerful for ad attribution, and integrated with Google's ecosystem. PostHog is gaining fast with product teams — it's open source, GDPR-friendly, includes session recording, feature flags, and A/B testing built in, with no data sampling. Teams concerned about privacy or product UX often run both.
GA4
8.5/10
Best for marketing analytics & Google ads
PostHog
9.1/10
Best for product analytics & privacy
Feature Comparison
| Feature | GA4 | PostHog |
|---|---|---|
| Pricing | Free (standard); GA360 $12,500+/yr | Free (1M events/mo); then $0.00045/event |
| Open Source | No — Google proprietary | Yes — MIT licensed |
| Self-Hosting | No | Yes — free |
| Session Recording | No | Yes — built-in |
| Feature Flags | No | Yes — built-in |
| A/B Testing | Via Google Optimize (deprecated) | Yes — built-in experiments |
| Data Sampling | Yes — on high-traffic sites | No sampling — full data |
| Best For | Marketing, SEO, Google Ads teams | Product engineers, privacy-focused startups |
Which do you use?
Who Should Choose What?
Choose GA4 if:
You run Google Ads, need Google Search Console integration, or your primary analytics need is marketing attribution. GA4 is free and the industry standard for web marketing analytics.
Choose PostHog if:
You are building a product and need session recordings, feature flags, A/B testing, and funnel analytics in one tool. PostHog is particularly strong for GDPR compliance and teams that want to own their data.
FAQ
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