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Auth0 vs Fly.io: 2026 Comparison

Auth0 Fly.io
Overview A flexible authentication and authorization platform for building secure login experiences with social, passwordless, and MFA support. A platform for running applications close to users worldwide with lightweight VMs and global edge deployment.
Pricing Freemium (Free-$23/1K MAU) Pay_per_use (Pay-as-you-go from $0)
Key Features
  • Universal Login
  • Social connections
  • MFA
  • Passwordless
  • SSO
  • RBAC
  • Breached password detection
  • Extensibility
  • Global edge deployment
  • Fly Machines
  • PostgreSQL
  • Redis
  • Private networking
  • Auto-scaling
  • Docker support
  • CLI tools
Pros
  • Comprehensive auth solution
  • Many social providers
  • Good documentation
  • Flexible rules
  • Global distribution
  • Good performance
  • Docker-native
  • Fair pricing
Cons
  • Expensive at scale
  • Complex pricing
  • Can be overkill
  • Okta acquisition concerns
  • Complexity for simple apps
  • Documentation gaps
  • Debugging can be hard
  • Smaller community