- Pick it if you are:
- Bloggers and content sites; Agencies managing many client sites
- Top complaint:
- Is Fathom Analytics free? No free plan, and the trial needs a card
- Price:
- From $15/mo
- Pick it if you are:
- Early-stage startups with an engineering team; Developers and indie hackers
- Top complaint:
- PostHog events not showing up because ad blockers block it
- Price:
- Free plan, paid from $250/mo
Score Comparison
Signals Comparison
Fathom Analytics
- Is Fathom Analytics free? No free plan, and the trial needs a card(6/10)
- Why is Fathom Analytics so expensive for small sites?(5/10)
- Custom events count toward the Fathom pageview limit(5/10)
- Fathom Analytics doesn't give refunds(5/10)
PostHog
- Why is my PostHog bill so high? Many separate usage meters(7/10)
Fathom Analytics
- Fathom dashboard locked after going over the plan limit(7/10)
- Fathom blocked by ad blockers after custom domains were removed(6/10)
- Fathom removed uptime monitoring in 2023(3/10)
- Fathom Analytics not tracking visits after installation(6/10)
- Fathom only showing the homepage in stats(5/10)
- Fathom numbers don't match Google Analytics(4/10)
PostHog
- PostHog events not showing up because ad blockers block it(7/10)
- PostHog session replay not recording some sessions(6/10)
- PostHog data doesn't match Google Analytics(5/10)
- PostHog feature flags flicker or return undefined(5/10)
- Data dropped forever after hitting a billing limit(6/10)
Fathom Analytics
- No funnels, user flows or heatmaps in Fathom(5/10)
PostHog
- Self-hosting PostHog is heavy and limited to a hobby setup(5/10)
Fathom Analytics
- Fathom can't be self-hosted and isn't open source(4/10)
PostHog
No signals
Fathom Analytics
- Fathom not tracking page changes in single-page apps(5/10)
- GA4 import into Fathom leaves out events(4/10)
PostHog
- Duplicate or missing pageviews in Next.js and SPAs(5/10)
Fathom Analytics
No signals
PostHog
- PostHog is overwhelming and has a steep learning curve(6/10)
- PostHog is built for engineers, not marketers(6/10)
- PostHog identify() merges or splits users incorrectly(6/10)
Fathom Analytics
No signals
PostHog
- PostHog queries and insights are slow on large datasets(6/10)
- Does PostHog slow down my website?(4/10)
Pricing Comparison
Fathom Analytics
Storage: Full history kept while subscribed
Limits: No funnels, user journeys, heatmaps or session replay. No self-hosting.
Storage: Full history kept while subscribed
Limits: Same as monthly plan.
PostHog
Storage: 1 year data retention
Limits: 1 project, 1 year data retention, community support only. Data above the free allowance is not ingested unless you add a card.
Storage: 7 year data retention
Limits: No base fee, but bills scale with traffic. Billing limits stop ingestion and the data over the limit is permanently lost.
Limits: No SAML or priority support (Scale)
Limits: No RBAC or dedicated support (Enterprise)
Feature Comparison
| Feature | Fathom Analytics | PostHog |
|---|---|---|
| Privacy | ||
| Cookieless tracking | ||
| EU data isolation EU visitor data processed in the EU automatically | ||
| Analytics | ||
| Product analytics (funnels, retention, paths) | ||
| Web analytics Included with product analytics events | ||
| Tracking | ||
| Custom events and revenue fathom.trackEvent() with optional _value | ||
| Funnels / user journeys | ||
| Heatmaps / session replay | ||
| Custom domain / ad-blocker bypass Removed March 2023 | ||
| Replay | ||
| Session replay Web and mobile; sampling, minimum duration and URL triggers | ||
| Heatmaps Viewed through the toolbar | ||
| Experimentation | ||
| Feature flags Bootstrapping and local evaluation supported | ||
| A/B testing / experiments Code-first, no mature visual editor | ||
| Integrations | ||
| Google Search Console integration | ||
| GA4 importer Free on all plans; daily data, no events | ||
| Analytics API | ||
| Feedback | ||
| Surveys | ||
| Monitoring | ||
| Error tracking | ||
| Uptime monitoring Removed October 2023 | ||
| Reporting | ||
| Shared dashboards Public or password-protected | ||
| Email reports and CSV export | ||
| Data | ||
| Data warehouse and SQL Sync sources and query with SQL | ||
| Managed reverse proxy Free for Cloud users; not HIPAA-compliant | ||
| Security | ||
| EU data hosting EU Cloud region | ||
| Hosting | ||
| Self-hosting Cloud only, closed source | ||
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