Analytics

Privacy-first / cookieless

• ★ Plausible — lightweight, cookieless, EU-friendly. Open source self-hostable; cheap hosted.
• ★ Umami — open-source Plausible alternative; self-host or hosted free.
• Fathom Analytics — paid, privacy-first.
• Cloudflare Web Analytics — free, no JS option, good if you're already on CF.
• Vercel Analytics — bundled with Vercel; free tier exists.

Product analytics (events, funnels, retention)

• ★ PostHog — events, funnels, replays, feature flags, experiments, surveys, LLM analytics. Generous free tier; open source self-hostable.
• Mixpanel — classic; small free tier.
• Amplitude — competitor; small free tier.
• June.so — newer, B2B-focused.
• Highlight — analytics + session replay + error monitoring.

Session replay

• PostHog Session Replay — bundled with PostHog.
• Highlight — free tier.
• OpenReplay — open source, self-hostable.
• rrweb — the underlying replay library used by many of these.

A/B testing / feature flags

See the dedicated Feature Flags & Experimentation page — Statsig, GrowthBook, PostHog, Flagsmith, Unleash, OpenFeature, Vercel Flags.

Pick this if…

• Default web traffic, privacy-friendly: Plausible or Umami.
• Default product analytics: PostHog (it covers replays and flags too).
• Session replay alone: OpenReplay (self-host), PostHog (hosted), or Microsoft Clarity (totally free).
• Heatmaps, totally free: Microsoft Clarity (see also Surveys & Feedback).