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Head-to-Head Specification Audit
Fly.io vs Postmark
Backend & API Developers · Global
Specification Matrix
| Metric | Fly.io | Postmark |
|---|---|---|
| Starting Price | CustomBetter | $15/mo |
| API Rate Limit | N/A | N/A |
| Target Country | Global | Global |
| Category | Cloud Hosting & Edge | Email API |
| Compliance | SOC2, GDPR | GDPR, SOC2 |
| Hosting Regions | US-East, EU-West, AP-Southeast, AF-South-ZA | US-East, EU-West |
| Native Integrations | 5 listed | 6 listedBetter |
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
Postmark — Key Specs
- ✓Average delivery time of 3.2 seconds — fastest transactional delivery benchmarked
- ✓Message Streams separate transactional from bulk email — protects domain reputation
- ✓GDPR-compliant EU-only sending available for EU data residency requirements
- ✓10-year email storage and retrieval via Message Retention add-on
Frequently Asked Questions
What is cheaper, Fly.io or Postmark?+
Fly.io starts at $0/mo, which is lower than Postmark at $15/mo.
Which tool is better for compliance — Fly.io or Postmark?+
Both support SOC2, GDPR.
Which tool is better suited for Global?+
Fly.io is evaluated for Backend & API Developers in Global with hosting regions: US-East, EU-West, AP-Southeast, AF-South-ZA. Postmark has hosting regions: US-East, EU-West. For data residency in Global, check each vendor's data processing agreements.
Data last verified: 12 June 2026
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