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Head-to-Head Specification Audit
Postmark vs Fly.io
SaaS Developers · Global
Specification Matrix
| Metric | Postmark | Fly.io |
|---|---|---|
| Starting Price | $15/mo | CustomBetter |
| API Rate Limit | N/A | N/A |
| Target Country | Global | Global |
| Category | Email API | Cloud Hosting & Edge |
| Compliance | GDPR, SOC2 | SOC2, GDPR |
| Hosting Regions | US-East, EU-West | US-East, EU-West, AP-Southeast, AF-South-ZA |
| Native Integrations | 6 listedBetter | 5 listed |
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
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, Postmark or Fly.io?+
Fly.io starts at $0/mo, which is lower than Postmark at $15/mo.
Which tool is better for compliance — Postmark or Fly.io?+
Both support GDPR, SOC2.
Which tool is better suited for Global?+
Postmark 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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