Which is better: Fathom Analytics or PostHog?

Fathom Analytics receives a KEEP score of 48/100 and SWITCH score of 88/100 (Primary verdict: AUTOMATE). PostHog receives a KEEP score of 68/100 and SWITCH score of 74/100 (Primary verdict: SELF HOST).

What is the price difference between Fathom Analytics and PostHog?

Fathom Analytics starting price is $15/mo (Paid only). PostHog starting price is $0/mo (Free tier available).

⚡ Head-to-Head Deterministic Intelligence

Fathom Analytics vs PostHog

Comprehensive deterministic comparison evaluating decision scores, pricing models, replacement difficulty, and open-source alternatives for 2026.

Analytics & Reporting

Fathom Analytics

Starting Price$15/mo

Simple, privacy-first website analytics alternative to Google Analytics.

Verdict:AUTOMATE

Full Fathom Analytics Review ↗

Product Analytics

PostHog

Starting PriceFree

Open-source product analytics suite with session replay, feature flags, and A/B testing.

Verdict:SELF HOST

Full PostHog Review ↗

Deterministic Decision Engine

Side-by-Side Decision Scores Matrix

Evaluated using pure deterministic algorithm scoring across retention, migration savings, self-hosting viability, and build complexity.

Evaluation Metric	Fathom Analytics	PostHog
Primary Verdict	AUTOMATE	SELF HOST
KEEP Score (Retention Value)	48/100	68/100
SWITCH Score (Migration Savings)	88/100	74/100
SELF-HOST Score (OSS Viability)	85/100	79/100
AUTOMATE Score (Workflow Parity)	100/100	78/100
BUILD Score (Custom In-House Feasibility)	35/100	15/100
Engine Confidence	84%	62%
Build Complexity (1 - 5)	2 / 5	4 / 5
API & Webhook Availability	4 / 5	5 / 5
Vendor Lock-in Risk	1 / 5	2 / 5
Data Portability Score	5 / 5	5 / 5

Cost Structure Analysis

Verified Pricing Tiers Comparison

Fathom Analytics Pricing Tiers

Startermonthly billing

$15/mo

PostHog Pricing Tiers

Freemonthly billing

Free

Scalemonthly billing

$45/mo

Zero License Fees

Self-Hostable Open Source Options

Fathom Analytics Open-Source Options

Umami21.4k★

Open-source web analytics.

Ackee4.2k★

Node.js privacy-focused analytics.

PostHog Open-Source Options

PostHog Self-Hosted23.1k★

Open-source product analytics backend.

Mixpanel1.2k★

Commercial product analytics platform.

Head-to-Head FAQs

Frequently Asked Questions: Fathom Analytics vs PostHog

Which tool is easier to migrate or build custom?▼

Fathom Analytics has a build complexity of 2/5 and API availability of 4/5. PostHog has a build complexity of 4/5 and API availability of 5/5.

Should I choose Fathom Analytics or PostHog?▼

If you prioritize retention value and deep integrations, PostHog leads with a KEEP score of 68/100. If you are looking to switch or optimize costs, review their secondary verdicts and open-source alternatives above.