Fathom Analytics vs PostHog
A source-aware comparison of pricing, documented capabilities and workflow fit.
Short answer
- Price: not directly comparable — Fathom Analytics is pricing not verified, PostHog is free tier available.
- How to start: Fathom Analytics is pricing not verified, PostHog is free tier available.
- Where they differ: only PostHog has open source / self-hostable and sso (saml); both offer public api.
These lines are generated from the pricing we track, not from a paid placement. How we score tools.
What Fathom Analytics is
Fathom Analytics is privacy-first web analytics with no cookies and EU data isolation options. No cookies means no consent banner in many jurisdictions, and the whole report fits on one page. The flip side is deliberately limited depth: no user-level funnels or cohort analysis, because it does not keep that data.
What PostHog is
PostHog is the 'all-in-one' product analytics suite for developers and modern startups. Unlike Google Analytics, which focuses on traffic, PostHog focuses on user behavior within your product. It combines powerful features like event tracking, session recordings, heatmaps, and feature flags into a single, open-source platform. It allows teams to build better products by understanding exactly how users interact with every feature, and even run A/B tests to see what works best.
Side by side
| Fathom Analytics | PostHog | |
|---|---|---|
| Category | Marketing | Marketing |
| How to start | Not verifiednot a monthly price | Free tiernot a monthly price |
| Public API | Yes | Yes |
| Mobile app | No | No |
| Open source / self-hostable | No | Yes |
| SSO (SAML) | No | Yes |
| Visit | Fathom Analytics ↗ | PostHog ↗ |
What Fathom Analytics is built to do
- Cookieless tracking
- Measures traffic without cookies or personal identifiers.
- Single-page dashboard
- Presents the whole report on one screen rather than a console.
- EU data isolation
- Offers processing routed through EU-owned infrastructure.
What PostHog is built to do
- Session Replays
- Watch real videos of users navigating your product to find bugs and friction.
- Feature Flags
- Roll out new features to specific users and turn them off instantly if needed.
- Funnels & Paths
- Visualize exactly where users are dropping off in your sign-up or checkout flows.
- Group Analytics
- Analyze behavior at the company level, not just the individual user level.
Choose Fathom Analytics if
- Site owners who want honest numbers without a consent banner.
Choose PostHog if
- Product Managers, Developers, and Growth Teams.
Evidence and freshness
Where a claim on this page comes from a vendor page, it is linked here.
Fathom Analytics: pros & cons
- No cookies, simplifying consent
- Fast, lightweight script
- Simple dashboard anyone can read
- Fewer features than full analytics platforms
- No free tier
- No user-level journeys by design
PostHog: pros & cons
- All-in-One: Replaces 5-6 different tools (Mixpanel, Hotjar, LaunchDarkly, etc.).
- Open Source: You can self-host it to ensure total data privacy and control.
- Powerful Free Tier: Extremely generous free plan for startups just starting out.
- Developer First: Built with a modern API and great documentation for engineers.
- Complex UI: The sheer number of tools can make the dashboard feel cluttered.
- Learning Curve: Mastering advanced queries and funnel analysis takes effort.
- Self-Hosting: Managing a high-traffic PostHog instance yourself is a technical challenge.
Our verdict on Fathom Analytics
Directly comparable with Plausible; pick on price and data residency, since capability is close.
Our verdict on PostHog
The best 'product-first' analytics tool for teams who want to build with data.