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Fathom Analytics vs Google Tag Manager

Based on 15 and 2504 real audits

View Fathom Analytics details | View Google Tag Manager details
MetricFathom AnalyticsGoogle Tag ManagerWinner
Performance6140Fathom Analytics
Accessibility8888Tie
Best Practices9486Fathom Analytics
SEO9791Fathom Analytics
Security6265Google Tag Manager
TTFB247ms372msFathom Analytics
Composite7673Fathom Analytics
Performance
Fathom Analytics
61
Google Tag Manager
40
Accessibility
Fathom Analytics
88
Google Tag Manager
88
Security
Fathom Analytics
62
Google Tag Manager
65
SEO
Fathom Analytics
97
Google Tag Manager
91
Composite
Fathom Analytics
76
Google Tag Manager
73

Fathom Analytics outperforms Google Tag Manager in 5 of 7 categories, with a stronger composite score (76 vs 73). Google Tag Manager leads in security.

When to choose Fathom Analytics

Choose Fathom Analytics when your primary concern is server response time and performance. Its audit data shows consistent strength in these areas across the sampled sites.

When to choose Google Tag Manager

Choose Google Tag Manager when your primary concern is security. Its audit data shows consistent strength in these areas across the sampled sites.

How this comparison was built

Scores are medians across 15 audited Fathom Analytics sites and 2504 audited Google Tag Manager sites in the BeaverCheck database. Every audit runs the same 100+ checks — Lighthouse performance, security headers, accessibility, SEO, server response time — against a real URL. No vendor input, no sponsorship, no affiliate links. Read the full methodology →

FAQ

Which is faster, Fathom Analytics or Google Tag Manager?
Based on real BeaverCheck audits, Fathom Analytics sites score higher on Lighthouse performance (61 vs 40 on average).
Which has better security, Fathom Analytics or Google Tag Manager?
Google Tag Manager sites score higher on security analysis (65 vs 62 on average).
Which has better accessibility, Fathom Analytics or Google Tag Manager?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Fathom Analytics (88 vs 88). Both technologies can be made fully accessible with care — the difference reflects common patterns in the sampled sites, not inherent platform limits.
Which is better for SEO, Fathom Analytics or Google Tag Manager?
Fathom Analytics sites score higher on Lighthouse SEO signals (97 vs 91 on average), which cover meta tags, crawlability, mobile friendliness, and structured data. Content strategy and backlinks still matter more than platform choice for ranking.
Which has faster server response (TTFB), Fathom Analytics or Google Tag Manager?
Fathom Analytics sites show lower Time to First Byte (247 ms vs 372 ms on average). TTFB depends heavily on hosting and CDN setup rather than the technology itself, but the sampled sites suggest a meaningful difference in common deployment patterns.
Should I choose Fathom Analytics or Google Tag Manager for my website?
Both platforms have trade-offs. Fathom Analytics scores higher on overall composite score while Fathom Analytics may excel in metrics you care about most. Run a free BeaverCheck audit on a real site using each to compare the metrics relevant to your use case.
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