Auth, email and analytics

Sign-in, transactional email and measuring usage.

• Clerk vs Auth0 vs Supabase Auth: what sign-in costs as your user base grows
  Free allowances, paid plan prices and per-user charges for three popular authentication services, how each one counts a user, and worked monthly costs at 10,000 and 80,000 users.
• Resend vs Postmark vs Amazon SES for transactional email: prices and trade-offs
  What it costs to send password resets, receipts and notifications through Resend, Postmark or Amazon SES, including free allowances, overage rates, SES's new plans, and a worked example at 30,000 emails a month.
• Plausible vs Fathom vs PostHog vs Google Analytics 4: website analytics compared
  Two privacy-focused paid analytics tools, a product analytics platform with a large free tier, and the free standard GA4: prices, limits, data retention and which questions each one answers best.

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