Fathom Analytics vs PostHog

Detailed side-by-side comparison

Fathom Analytics

From $15/mo

Fathom Analytics is a privacy-first website analytics platform designed for simplicity and GDPR compliance without using cookies or tracking personal data. It focuses on providing essential website metrics through a lightweight, fast-loading script that won't slow down your site.

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PostHog

Free

PostHog is an open-source, all-in-one product analytics platform that combines analytics, session recordings, feature flags, and A/B testing in a single tool. It's built for engineering and product teams who need deep user behavior insights with the option to self-host for complete data control.

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Feature Comparison

Feature	Fathom Analytics	PostHog
Privacy & Compliance	Cookie-free tracking that's automatically GDPR, CCPA, and PECR compliant without requiring consent banners	Compliant when self-hosted; cloud version requires configuration but offers complete data ownership with self-hosting option
Analytics Depth	Simple website analytics focused on page views, referrers, and basic visitor metrics without overwhelming complexity	Advanced product analytics with event tracking, user path analysis, funnels, retention cohorts, and custom dashboards
Session Analysis	Basic real-time visitor data without individual session tracking or recordings	Full session recording and replay functionality to watch exactly how users interact with your product
Experimentation Tools	No built-in A/B testing or feature flag capabilities	Integrated feature flags, A/B testing, and multivariate testing for product experimentation
Setup Complexity	Extremely simple setup with a single lightweight script tag, user-friendly interface designed for non-technical users	More complex setup requiring event instrumentation and technical knowledge, especially for self-hosted deployments
Performance Impact	Minimal impact with an under 1KB script that loads asynchronously and doesn't affect page speed	Heavier implementation due to session recording and event tracking capabilities, though optimized for performance

Pricing Comparison

Fathom Analytics starts at $15/month with straightforward pricing based on page views, while PostHog offers a generous free tier with 1 million events monthly and usage-based pricing thereafter. PostHog can be more cost-effective initially but may become expensive at scale, whereas Fathom has predictable costs but higher entry price.

Verdict

Choose Fathom Analytics if...

Choose Fathom Analytics if you need simple, privacy-first website analytics with minimal setup, don't require advanced product analytics features, and want a lightweight solution that won't impact site performance or require cookie consent banners.

Choose PostHog if...

Choose PostHog if you're a product or engineering team that needs comprehensive user behavior insights including session recordings, A/B testing, and feature flags, or if you want to self-host for complete data control and have the technical resources to manage a more complex analytics stack.

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Analytics

Pros & Cons

Fathom Analytics

Pros

+ No cookie banners required due to privacy-first approach
+ Fast loading script that doesn't impact site performance
+ Simple, intuitive interface without overwhelming data
+ Excellent customer support and transparent company values

Cons

- Limited advanced features compared to Google Analytics
- Higher cost for high-traffic websites
- Fewer integration options than enterprise analytics tools

PostHog

Pros

+ Open-source with transparent pricing and no data sampling
+ Combines multiple tools (analytics, session replay, feature flags) in one platform
+ Generous free tier with 1 million events per month
+ Self-hosting option for complete data control and privacy compliance

Cons

- Steeper learning curve compared to simpler analytics tools
- Self-hosted version requires technical expertise to maintain
- Can become expensive at scale with high event volumes