Clerk vs Fly.io: what each really costs
Team size
Billing
Clerk
No plan for this billing option
No paid plan to compare for this billing option.
Fly.io
No plan for this billing option
No paid plan to compare for this billing option.
| 10 people | Clerk | Fly.io |
|---|---|---|
| Entry paid plan | No plan for this billing option | No plan for this billing option |
| Vendor price | ||
| Monthly cost | ||
| Annual cost | ||
| Per user / year | ||
| Billing commitment | Not recorded | Not recorded |
| Minimum seats | None stated | None stated |
| Free plan | Yes | No free plan listed |
| Free trial | Not stated | Not stated |
Calculated by SpecEntry from official vendor prices. Taxes and optional add-ons are not included. Open each product page for every plan and the official source.
Clerk vs Fly.io: features
Key features as each vendor lists them. A feature missing from a list does not mean the product lacks it.
Clerk
- Multifactor authenticationEnforces each user's self-serve MFA settings automatically at sign-in.
- Social sign-onAdds social sign-in options to an application.
- Fraud sign-up preventionUses built-in machine learning to reduce fraudulent sign-ups.
- One-time passcodesDelivers one-time passcodes with built-in brute-force prevention.
- Magic linksSupports passwordless sign-in via magic links that also filter spam.
- Password authenticationPassword sign-in with breach detection and recovery options.
- Domain-based organizationsLets users discover and join organizations based on their email domain.
- Team invitationsLets customers invite their teammates to the application.
Source:clerk.com ·
Fly.io
- Fly MachinesHardware-virtualized containers that launch instantly and run on demand.
- Isolated sandboxesHardware-isolated sandboxes for running untrusted or AI-generated code.
- Sprites environmentsEach Sprite is a self-contained environment ready in under a second.
- Checkpoint and restoreCheckpoint an entire environment and restore it after breaking changes.
- NVMe and object storageLocal NVMe for low latency plus global durable object storage.
- Agent-ready CLIs and MCPCLIs and MCP servers designed to be driven by AI agents.
- KVM hardware isolationApps run KVM hardware-isolated on Fly.io's own hardware.
Source:fly.io ·
Clerk vs Fly.io pricing questions
How much do Clerk and Fly.io cost?
Clerk paid plans start at $20 per month, billed annually (Pro). Fly.io paid plans start at $2.19 per month ($0.0030/hr), billed per second (Machine shared-cpu-1x 256MB).
Is Clerk or Fly.io cheaper for 5 users?
Clerk is cheaper for 5 users: $240 per year on Pro, against $348 per year for Fly.io on Standard support. That is $108 less per year, before tax.
Is Clerk or Fly.io cheaper for 10 users?
Clerk is cheaper for 10 users: $240 per year on Pro, against $348 per year for Fly.io on Standard support. That is $108 less per year, before tax.
Is Clerk or Fly.io cheaper for 25 users?
Clerk is cheaper for 25 users: $240 per year on Pro, against $348 per year for Fly.io on Standard support. That is $108 less per year, before tax.
Do Clerk and Fly.io have a free plan?
Clerk lists a free plan; Fly.io does not list one on its official pricing.