Head-to-head, indicative as of Oct 2026. Prices change — always confirm on the vendor page.
Quick read: pick Fly.io if your workload is apps that need to be close to users everywhere and its included egress fits your traffic shape; pick Datadog if you need unified metrics, logs, traces at scale. For anything latency-sensitive at the edge, cold start row is the tiebreaker.
| Fly.io | Datadog | |
|---|---|---|
| Type | Global VM platform | Observability platform |
| Free tier | Small allowances on paid plan | 2 hosts trial |
| Paid pricing (indicative) | Pay-as-you-go from ~$2/mo per VM | From ~$15/host/mo (infra), modules priced separately |
| Egress | Free tier then billed | n/a (SaaS) |
| Cold start | ~300ms (Firecracker VMs) | n/a |
| Regions | 30+ regions | Global SaaS |
| Best for | Apps that need to be close to users everywhere | Unified metrics, logs, traces at scale |
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Last reviewed 2026-10-02 · NinjaOps SEO grid · DevOps blog