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Auth0 vs GMass: 2026 Comparison

Auth0 GMass
Overview A flexible authentication and authorization platform for building secure login experiences with social, passwordless, and MFA support. GMass is a mass email and cold outreach tool that works directly inside Gmail. It turns Gmail into a powerful email marketing and outreach platform with mail merge, automatic follow-ups, and campaign analytics.
Pricing Freemium (Free-$23/1K MAU) Freemium ($0-55/mo)
Key Features
  • Universal Login
  • Social connections
  • MFA
  • Passwordless
  • SSO
  • RBAC
  • Breached password detection
  • Extensibility
  • Gmail-based sending
  • mail merge
  • automatic follow-ups
  • email tracking
  • campaign reports
  • scheduling
  • Google Sheets integration
Pros
  • Comprehensive auth solution
  • Many social providers
  • Good documentation
  • Flexible rules
  • Works inside Gmail
  • Very easy to use
  • Affordable
  • Great Google Sheets integration
Cons
  • Expensive at scale
  • Complex pricing
  • Can be overkill
  • Okta acquisition concerns
  • Gmail sending limits apply
  • Limited advanced features
  • No multi-channel support