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Head-to-Head Specification Audit
Vercel AI SDK vs Fly.io
AI SDK for Next.js and React · Global
Specification Matrix
| Metric | Vercel AI SDK | Fly.io |
|---|---|---|
| Starting Price | CustomBetter | Custom |
| API Rate Limit | N/A | N/A |
| Target Country | Global | Global |
| Category | AI Infrastructure | Cloud Hosting & Edge |
| Compliance | SOC2 | SOC2, GDPR |
| Hosting Regions | Global-Edge | US-East, EU-West, AP-Southeast, AF-South-ZA |
| Native Integrations | 6 listedBetter | 5 listed |
Vercel AI SDK — Key Specs
- ✓Best-in-class streaming UX — useChat, useCompletion hooks
- ✓Unified API: OpenAI, Anthropic, Mistral, Google all behind same interface
- ✓Edge Function compatible — runs globally at the edge
- ✓Free and open source
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, Vercel AI SDK or Fly.io?+
Both tools start at $0/mo on their entry plans.
Which tool is better for compliance — Vercel AI SDK or Fly.io?+
Both support SOC2. Fly.io additionally supports GDPR.
Which tool is better suited for Global?+
Vercel AI SDK is evaluated for AI SDK for Next.js and React in Global with hosting regions: Global-Edge. 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: 26 June 2026
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