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Auth0 vs MXToolbox: 2026 Comparison

Auth0 MXToolbox
Overview A flexible authentication and authorization platform for building secure login experiences with social, passwordless, and MFA support. Comprehensive email and DNS monitoring platform for diagnosing email delivery issues and monitoring domain health.
Pricing Freemium (Free-$23/1K MAU) Freemium ($0-399/mo)
Key Features
  • Universal Login
  • Social connections
  • MFA
  • Passwordless
  • SSO
  • RBAC
  • Breached password detection
  • Extensibility
  • MX lookup
  • Blacklist check
  • SMTP diagnostics
  • DMARC
  • SPF
  • Domain health
  • Monitoring
Pros
  • Comprehensive auth solution
  • Many social providers
  • Good documentation
  • Flexible rules
  • Free tools
  • Comprehensive DNS checks
  • Industry standard
  • Monitoring
Cons
  • Expensive at scale
  • Complex pricing
  • Can be overkill
  • Okta acquisition concerns
  • Pro features expensive
  • Interface dated
  • Overwhelming for beginners