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Head-to-Head Specification Audit
Clerk vs Fly.io
SaaS Developers · Global
Specification Matrix
| Metric | Clerk | Fly.io |
|---|---|---|
| Starting Price | $25/mo | CustomBetter |
| API Rate Limit | N/A | N/A |
| Target Country | Global | Global |
| Category | Authentication & Identity | Cloud Hosting & Edge |
| Compliance | SOC2, GDPR, CCPA | SOC2, GDPR |
| Hosting Regions | US-East, EU-West | US-East, EU-West, AP-Southeast, AF-South-ZA |
| Native Integrations | 7 listedBetter | 5 listed |
Clerk — Key Specs
- ✓Drop-in React components for sign-in, sign-up, and user profile — 15-minute integration
- ✓Multi-tenancy with Organizations built-in — no custom RBAC required for B2B SaaS
- ✓Passkey, WebAuthn, and magic link support included on all plans
- ✓Webhooks on every auth event for syncing users to Supabase, Stripe, or your database
Fly.io — Key Specs
- ✓Deploy Docker containers to 30+ global regions — closest to ZA is Johannesburg (jnb)
- ✓Machines API launches VMs in under 300ms — ideal for per-request compute isolation
- ✓Fly Volumes provide persistent SSDs for stateful apps like databases and file stores
- ✓Free allowance covers 3 shared-CPU VMs and 3GB of persistent storage permanently
Frequently Asked Questions
What is cheaper, Clerk or Fly.io?+
Fly.io starts at $0/mo, which is lower than Clerk at $25/mo.
Which tool is better for compliance — Clerk or Fly.io?+
Both support SOC2, GDPR. Clerk additionally supports CCPA.
Which tool is better suited for Global?+
Clerk is evaluated for SaaS Developers in Global with hosting regions: US-East, EU-West. Fly.io has hosting regions: US-East, EU-West, AP-Southeast, AF-South-ZA. For data residency in Global, check each vendor's data processing agreements.
Data last verified: 12 June 2026
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