Fathom vs PostHog — Which One Wins?
A detailed, side-by-side comparison of Fathom and PostHog to help you pick the right tool for your workflow.
Quick Verdict
PostHog takes the lead with a 4.5 rating and is best for startups wanting product analytics, session replay, and feature flags in one open-source platform.. Fathom (4.4) is the better pick if you need businesses wanting the most polished privacy-friendly analytics with premium support..
Side-by-Side Comparison
| Criteria | Fathom | PostHog |
|---|---|---|
| Rating | ★★★★ 4.4(89) | ★★★★ 4.5(167) |
| Pricing Model | paid | open_source |
| Starter Price | $15/mo (100K pageviews) | Pay-as-you-go above free limits |
| Free Tier | Yes | Yes |
| Platforms | web | web |
| Learning Curve | easy | medium |
| API Available | Yes | Yes |
| Best For | Businesses wanting the most polished privacy-friendly analytics with premium support. | Startups wanting product analytics, session replay, and feature flags in one open-source platform. |
| Verdict | situational | recommended |
Feature Checklist
| Feature | Fathom | PostHog |
|---|---|---|
| Cookie-free analytics | — | |
| Beautiful single-page dashboard | — | |
| EU data isolation | — | |
| Custom events and goals | — | |
| UTM campaign tracking | — | |
| Multi-domain support | — | |
| Product analytics | — | |
| Session replay | — | |
| Feature flags | — | |
| A/B testing | — | |
| Surveys | — | |
| Self-hostable open source | — |
Fathom
Pros
- ✓Most polished privacy-friendly analytics dashboard
- ✓EU data isolation for GDPR compliance
- ✓Accurate visitor counting without cookies
Cons
- ✕More expensive than Plausible for similar features
- ✕No free tier or self-hosting option
- ✕Less capable than GA4 for marketing analytics
PostHog
Pros
- ✓All-in-one replaces 4-5 separate tools
- ✓Open source with free self-hosting
- ✓Cloud free tiers are genuinely generous
Cons
- ✕Individual analytics less powerful than dedicated Mixpanel/Amplitude
- ✕Session replay less polished than FullStory
- ✕Self-hosting requires infrastructure management
The Bottom Line
Both Fathom and PostHog are solid tools in the Analytics & Data space. PostHog edges ahead with a stronger overall rating (4.5 vs 4.4) and is the better choice for startups wanting product analytics, session replay, and feature flags in one open-source platform.. However, if you prioritize businesses wanting the most polished privacy-friendly analytics with premium support., Fathom is worth serious consideration. We recommend trying the free tier or trial of each before committing.