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Google Tag Manager vs PostHog

Based on 2504 and 62 real audits

View Google Tag Manager details | View PostHog details
MetricGoogle Tag ManagerPostHogWinner
Performance4037Google Tag Manager
Accessibility8888Tie
Best Practices8686Tie
SEO9194PostHog
Security6566PostHog
TTFB372ms315msPostHog
Composite7374PostHog
Performance
Google Tag Manager
40
PostHog
37
Accessibility
Google Tag Manager
88
PostHog
88
Security
Google Tag Manager
65
PostHog
66
SEO
Google Tag Manager
91
PostHog
94
Composite
Google Tag Manager
73
PostHog
74

PostHog outperforms Google Tag Manager in 4 of 7 categories, with a stronger composite score (74 vs 73). Google Tag Manager leads in performance.

When to choose Google Tag Manager

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

When to choose PostHog

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

How this comparison was built

Scores are medians across 2504 audited Google Tag Manager sites and 62 audited PostHog 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, Google Tag Manager or PostHog?
Based on real BeaverCheck audits, Google Tag Manager sites score higher on Lighthouse performance (40 vs 37 on average).
Which has better security, Google Tag Manager or PostHog?
PostHog sites score higher on security analysis (66 vs 65 on average).
Which has better accessibility, Google Tag Manager or PostHog?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Google Tag Manager (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, Google Tag Manager or PostHog?
PostHog sites score higher on Lighthouse SEO signals (94 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), Google Tag Manager or PostHog?
PostHog sites show lower Time to First Byte (315 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 Google Tag Manager or PostHog for my website?
Both platforms have trade-offs. Google Tag Manager scores higher on overall composite score while Google Tag Manager 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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