Best Privacy-First Analytics Compared: Plausible vs Fathom vs Umami + 4 More

"Privacy-first" is a marketing label. The code tells a different story.

We decompiled every privacy-first analytics script in the Nuxt Scripts registry and ran AST analysis to catalogue exactly which browser APIs each one touches at runtime. No marketing claims, no privacy policy excerpts - what the script does.

The finding: even among the best privacy-first analytics tools, the API surface ranges from 2 to 7 browser APIs. That gap determines what data leaves your users' browsers.

How We Compared These 7 Privacy-First Analytics Tools

All seven providers share one critical property: zero cookies. That's the baseline for any privacy-first Google Analytics alternative. But the similarity ends there.

The tools fall into three groups based on how many browser APIs they access:

• Minimal (2 APIs): Plausible Analytics, Fathom Analytics, Vercel Analytics
• Medium (3–4 APIs): Umami Analytics, Cloudflare Web Analytics
• Broader (6–8 APIs): Rybbit Analytics, Databuddy Analytics

None of these providers use fingerprinting APIs (canvas, WebGL, audioContext) or set cookies. The differences are in how much device and session context they collect alongside pageview data. Rybbit and Databuddy also use localStorage for persistent identifiers - still cookie-free, but with cross-session tracking capability.

Plausible Analytics Review

Plausible Analytics is the most popular privacy-first Google Analytics alternative. It touches 2 browser APIs: localStorage (for session deduplication) and fetch.

Fathom Analytics Review

Fathom Analytics matches Plausible's minimal API surface with 2 APIs: localStorage and sendBeacon.

Umami Analytics Review

Umami Analytics is an open-source, self-hostable privacy analytics tool. It uses 3 APIs: localStorage, fetch, and screen (for viewport dimensions).

Cloudflare Web Analytics Review

Cloudflare Web Analytics uses 4 APIs: userAgent, sendBeacon, xhr, and performanceObserver - the extra APIs power built-in Core Web Vitals collection.

Rybbit Analytics Review

Rybbit Analytics is an open-source privacy analytics tool that touches 6 APIs including localStorage, performanceObserver, screen, and languages.

Databuddy Analytics Review

Databuddy Analytics touches the most APIs at 8: localStorage, sessionStorage, performanceObserver, screen, languages, userAgent, sendBeacon, and fetch.

Vercel Analytics Review

Vercel Analytics is the most minimal option, touching 2 APIs: userAgent (device classification) and fetch.

Performance Comparison: All 7 Privacy-First Analytics Tools

Fewer APIs and smaller scripts translate directly to less main-thread work:

Every privacy-first analytics provider stays under 2ms of script execution and 10ms of task duration.

The three providers that collect Core Web Vitals (Cloudflare, Rybbit, Databuddy) carry larger decoded sizes (25–30 KB) because the performanceObserver integration adds measurement code. That's a reasonable tradeoff if you want CWV data without a separate monitoring tool.

GDPR Compliance: Why Cookie-Free Analytics Win in 2026

The Consent Banner Problem

EU cookie acceptance rates dropped to 40–58% across member states in 2026 (CNIL guidance, February 2026). Cookie-based analytics like GA4 and default Matomo lose 40–60% of their traffic data to "Reject All" clicks. All seven privacy-first analytics tools in this comparison capture close to 100%.

Matomo's CNIL Exemption

Matomo is the only analytics platform with a formal consent exemption from France's data protection authority. The exemption requires IP masking, 13-month cookie caps, and no third-party data sharing. However, Matomo's default configuration uses cookies - you must explicitly configure cookie-free mode to qualify.

First-Party Mode: Recovering Ad-Blocked Data

25–45% of users block trackers (Blockthrough Ad-Block Report 2026). Even privacy-first scripts hosted on known domains (plausible.io, cloud.umami.is) get blocked at the DNS level.

Nuxt Scripts' first-party mode proxies analytics traffic through your own domain:

// nuxt.config.ts
export default defineNuxtConfig({
  scripts: {
    registry: {
      plausibleAnalytics: {
        domain: 'yourdomain.com'
      }
    }
  }
})

Requests go to yourdomain.com/_scripts/plausible instead of plausible.io/js/script.js. Indistinguishable from a first-party request to most blockers. Data accuracy returns to near 100%.

Which Privacy-First Analytics Tool Should You Choose?

For most apps: start with Plausible Analytics, Fathom Analytics, or Vercel Analytics. Add Cloudflare Web Analytics or Rybbit Analytics if you need Core Web Vitals. Only reach for GA4 or Matomo if you need specific features that privacy-first analytics tools don't offer.

Last reviewed: March 2026

Related Resources

• Analytics Script Performance Comparison
• Choosing the Right Analytics for Nuxt
• Nuxt Scripts Documentation