The analytics landscape has split in two: traditional tools (Google Analytics, Mixpanel) that track everything but raise privacy concerns, and privacy-first tools (Plausible, Umami, PostHog) that give you actionable data without compromising user privacy. In 2026, with GDPR enforcement and cookie consent fatigue, more developers are choosing privacy-first analytics. This comparison covers both camps.
Quick Comparison
| Feature | PostHog | Plausible | Umami | Mixpanel |
|---|
| Type | Product analytics suite | Privacy-first web analytics | Open source web analytics | Product analytics platform |
| Self-Hosted | Yes (open source, MIT) | Yes (self-hosted option) | Yes (open source, MIT) | No (SaaS only) |
| GDPR Compliant | Yes (with self-hosting or EU cloud) | Yes (by design, no cookies) | Yes (no cookies, no PII) | Requires cookie consent |
| Cookie Banner Needed | Optional (anonymous by default) | No (cookieless) | No (cookieless) | Yes (uses cookies) |
| Session Replay | Yes (built-in) | No | No | Yes (add-on) |
| Feature Flags | Yes (built-in) | No | No | No |
| A/B Testing | Yes (built-in experimentation) | No | No | Yes (add-on) |
| Event Tracking | Auto-capture + custom events | Custom events | Custom events | Custom events |
| Pricing (Free) | 1M events/mo free | None (paid only) | Free (self-hosted) | 1K MTU free |
| Paid Start | $0.00031/event after free | $9/mo (10K pageviews) | Free (self-hosted), $20/mo Cloud | $20/mo (Growth) |
| Best For | Product teams, all-in-one suite | Simple, privacy-first websites | Developers who want free analytics | Advanced product analytics |
Privacy-First vs Traditional Analytics
| Factor | Privacy-First (Plausible, Umami) | Traditional (Google Analytics, Mixpanel) |
|---|
| Data Collection | Aggregate only, no personal data, no cookies | Individual user tracking, cookies, device fingerprinting |
| Script Size | <1 KB (Plausible), <2 KB (Umami) | 40+ KB (GA4), 250+ KB (Mixpanel) |
| Dashboard | Simple, focused on key metrics | Complex, hundreds of reports |
| User Identification | Not possible (by design) | User-level tracking, cohorts, funnels |
| Data Ownership | You own the data (self-hosted option) | Vendor owns the data |
| Cookie Consent | Not required (no cookies) | Required (GDPR/CCPA) |
Decision Matrix
| Scenario | Best Tool | Why |
|---|
| Product analytics + flags + replay + A/B testing | PostHog | All-in-one suite, open source, generous free tier |
| Simple website analytics, privacy-first | Plausible | Best UX, cookieless, lightweight script |
| Self-hosted, completely free analytics | Umami | MIT license, easy to self-host on Railway or VPS |
| Advanced user segmentation and funnel analysis | Mixpanel | Most powerful for user-level behavioral analysis |
| Marketing site + blog only | Umami or Plausible | Simple, lightweight, no cookie banner needed |
Bottom line: PostHog is the most impressive — product analytics, session replay, feature flags, and A/B testing in one open source platform. For simple websites, Plausible or Umami give you the key metrics without cookies or complexity. Mixpanel is still king for advanced product analytics, but the privacy-first tools cover 90% of what most teams need. See also: Best Feature Flag Tools and Best Open Source SaaS Alternatives.