Fathom Analytics

What Fathom Is

Fathom is privacy-first analytics positioned directly against Plausible. Canadian company, profitable, growing. Similar market pitch: lightweight, cookie-free, no consent banner needed (EU). But with some meaningful differentiators.

Script size: ~2.5KB (gzipped) — slightly heavier than Plausible
Infrastructure: Cloud-hosted with EU data isolation option
Founded: 2019, same vintage as Plausible
Reporting: Email reporting built in

Key Differences from Plausible

Aspect	Fathom	Plausible
Bot filtering	Intelligent (aggressive)	Basic
EU isolation	Optional EU servers	Default EU-only
Email reports	Unlimited	Not available
Dashboard filtering	More granular	More basic
Self-hosting	No	Yes (CE)
Pricing entry	$15/month	$9/month
Script size	~2.5KB	~1KB
Pageview limits	More generous	More conservative

Bottom line: Fathom is Plausible with better reporting automation and bot filtering. Trade-off: $6/month more, no self-hosting option.

Implementation

Direct script embed (recommended)

Add this to your site’s <head>:
```
<script src="https://cdn.usefathom.com/script.js" data-site="XXXXX" defer></script>
```
Replace XXXXX with your site ID from Fathom dashboard.
Custom domain for script serving

Unlike Plausible, Fathom includes a built-in feature to serve the script through your own domain. This improves ad blocker avoidance without additional proxy setup:
```
<script src="https://yourdomain.com/fathom.js" data-site="XXXXX" defer></script>
```
Configure this in Fathom’s settings. The script is automatically available at your custom domain after setup.
Via GTM (not recommended)

You can load Fathom through Google Tag Manager, but same caveats apply as Plausible:
- GTM is more aggressively blocked than direct script loads
- You lose the lightweight advantage
- If using GTM anyway, consider GA4 instead

Content Security Policy (CSP)

If you have CSP headers, allow Fathom:

script-src 'self' https://cdn.usefathom.com https://yourdomain.com;
connect-src 'self' https://api.usefathom.com;

Custom Events

Fathom’s event API is simpler than Plausible’s:

// Basic event
window.fathom.trackEvent('Signup');

// Event with value (in cents)
window.fathom.trackEvent('Purchase', {
  value: 9999 // $99.99
});

// Event with custom properties
window.fathom.trackEvent('Form Submission', {
  value: 5000,
  custom: {
    form_type: 'contact',
    plan: 'premium'
  }
});

// Form tracking
document.querySelector('#signup-form').addEventListener('submit', (e) => {
  window.fathom.trackEvent('Newsletter Signup', {
    custom: {
      email_captured: 'yes'
    }
  });
});

// Button click tracking
document.querySelector('.cta-button').addEventListener('click', () => {
  window.fathom.trackEvent('CTA Click', {
    custom: {
      button_text: 'Get Started'
    }
  });
});

UTM and Referrer Tracking

Fathom automatically parses:

UTM parameters: utm_source, utm_medium, utm_campaign, utm_content, utm_term
Referrer sources: Direct, organic, referral (broken down by domain)
Device categorization: Desktop, mobile, tablet
Browser and OS: Automatically detected

No custom configuration needed. Filter your dashboard by any of these dimensions.

Bot Filtering

Fathom’s bot filtering is more aggressive than Plausible’s. It filters out:

Identified bots and crawlers
Devices without user agents
Suspicious traffic patterns
Known bot networks

If you see a significant traffic drop after switching from GA4 (20-40% is normal), much of this is bot traffic that GA4 was counting.

What You Give Up vs GA4

Same fundamental trade-offs as Plausible, but slightly different emphasis:

No funnel analysis — Can’t visualize multi-step drop-off
No path exploration — Can’t map user journeys
No ecommerce item-level data — Revenue only, no SKU-level tracking
No custom dimensions — Properties on events only
No segments — Can’t split data by user attributes
No BigQuery export — API and CSV export only
No cross-device tracking — Mobile and desktop separate

If you need any of these capabilities, GA4 or a hybrid approach is better.

Pricing

100K pageviews/month: $15
500K pageviews/month: $35
1M+ pageviews/month: Custom

More generous pageview limits than Plausible at equivalent price points. No free tier.

Email Reports

Fathom’s real advantage over Plausible: automated reporting.

Weekly reports: Automatic email with key metrics (visitors, pageviews, top pages)
Monthly reports: Comprehensive performance overview
Custom frequency: Configure reporting cadence per site
Shareable links: Send read-only dashboard links to stakeholders

This is valuable for teams that need executive visibility without requiring dashboard access.

EU Data Isolation

If data residency is a strict requirement (GDPR, SCHREMS II, data localization laws), Fathom offers EU isolation:

All data processed within EU infrastructure
No transfer to US servers
GDPR compliant by default

Toggle this in your site settings. No performance impact.

When to Choose Fathom

✅ Good fit:

Content/marketing sites that need email reporting
Teams valuing EU data isolation
Aggressive bot filtering important (high spam traffic)
Need slightly more granular filtering than Plausible
Want custom domain script serving without proxy complexity

❌ Bad fit:

Budget-conscious (Plausible is cheaper)
Self-hosting required (not available)
Need Plausible’s open-source ecosystem
Lightweight script size critical (Plausible is ~60% smaller)

Fathom vs Plausible: When to Choose Each

Pick Fathom if:

Email reporting is important
EU data isolation is mandatory
Bot traffic is a significant problem
You prefer cloud-only (no self-hosting considerations)

Pick Plausible if:

Budget is tight ($9 vs $15/month matters at scale)
You want self-hosting option
You want the lightest possible script
Complexity is a feature (Plausible’s dashboard is even simpler)

Fathom vs Plausible: Deep Comparison Side-by-side feature comparison and decision matrix

Privacy-First Analytics Guide Why cookie-free analytics matter for compliance

Migrating from GA4 to Fathom Setup, configuration, and data mapping

Plausible Analytics Fathom's primary competitor with self-hosting

Simple Analytics Even more minimal alternative