Documentation-based comparison
Fathom Analytics versus PostHog
Compare documented scope and conditions. Unknowns remain unknown; different billing units do not establish a cost winner.
What the evidence answers
A reading of reviewed official documentation for Fathom Analytics and PostHog. It is not a hands-on test, a ranking or a recommendation of one product.
Price
- Fathom Analytics From $15/mo
- 100,000 monthly pageviews: $15.00 monthly
- PostHog Free plan · paid prices not verified
- Free: no subscription charge
A complete like-for-like price comparison is not established; the next checks say what is missing.
Documented for both
- Events
- Fathom Analytics 100,000 monthly pageviews: 100,000 shared pageviews/custom events per month
- PostHog Free: 1,000,000 analytics events per month
- Retention
- Fathom Analytics Full analytics history while subscribed
- PostHog Free: 1 year
Limits to check
- Fathom Analytics Pageviews and custom events share one allowance across all sites. Extra site packs are charged separately.
- PostHog Analytics, replay and feature flags have different usage allowances. Free has one project and one year of retention; adding a card enables paid usage.
Not verified yet
No reviewed evidence for either product on privacy and exports.
Documented for one product only, shown in the table below: Fathom Analytics: sites; PostHog: projects.
Not verified means our reviewed sources do not establish it. It does not mean a product lacks the capability or that it costs nothing.
Next steps
- Confirm PostHog's paid plan prices, billing term and taxes on its official pricing page; only its free plan is verified here.
- Ask Fathom Analytics about privacy, exports and projects; our sources do not establish them yet.
- Ask PostHog about privacy, exports and sites; our sources do not establish them yet.
| Requirement | Fathom Analytics | PostHog |
|---|---|---|
| Pricing | From $15/mo | Free plan · paid prices not verified |
| Who it is for | Website analytics with pageviews, custom events, campaign tracking and reports. Verified Oct 18, 2026 · Fathom Analytics: official product and pricing documentation | Analytics based on events, alongside separately metered replay, feature flags and other products. Verified Oct 18, 2026 · PostHog: official product and pricing documentation |
| Coverage limits | Pageviews and custom events share one allowance across all sites. Extra site packs are charged separately. Verified Oct 18, 2026 · Fathom Analytics: official product and pricing documentation | Analytics, replay and feature flags have different usage allowances. Free has one project and one year of retention; adding a card enables paid usage. Verified Oct 18, 2026 · PostHog: official product and pricing documentation |
| Events |
|
|
| Retention | Full analytics history while subscribed Verified Oct 18, 2026 · Fathom Analytics: official product and pricing documentation |
|
| Sites |
| Not verified |
| Projects | Not verified |
|
| Coverage note | Official documentation checked on 18 October 2026; no hands-on test. | Official documentation checked on 18 October 2026; no hands-on test. |
2 requirements without reviewed evidence here
Not verified means the reviewed sources do not establish it; it does not mean a product lacks it or that it costs nothing.
- Privacy Fathom Analytics: not verified · PostHog: not verified
- Exports Fathom Analytics: not verified · PostHog: not verified