Fly Machines vs Docker Hub
A detailed comparison to help you choose between Fly Machines and Docker Hub.
Quick Verdict
3.9/5
Fly Machines
0 reviews
3.7/5
Docker Hub
0 reviews
Fly Machines is rated higher (3.9 vs 3.7). Fly Machines are Fly.io's fast-starting virtual machines for containerised workloads. Start in 300ms, stop when idle to save costs. Used for auto-scaling web services and ephemeral compute. Docker Hub is the world's largest container image registry with 15M+ images. Free tier for public images, automated builds, and webhooks. Official images for nginx, postgres, redis, node, python, and more.
Fly Machines Fast-starting VMs for containerised apps at the edge | Docker Hub The world's largest container image registry | |
|---|---|---|
| Overview | ||
| Rating | 3.9 (0 reviews)✓ | 3.7 (0 reviews) |
| Pricing model | usage-based | freemium |
| Starting price | From $2.19/mo | Free tier available✓ |
| Best for | Developers who want fast-starting containers that scale to zero between requests at the edge, and teams building custom control planes on a VM-per-container API | Every team building containers as the source of base images and verified publisher content — with Pro seats for individual developers and CI mirrors for anything that automates at scale. |
| Features | ||
| IPv6 | ||
| DDoS protection | ||
| Automated backups | ||
| Snapshots | ||
| Managed option | ||
| Bare metal | ||
| GPU available | ||
| S3-compatible | ||
| Hourly billing | ||
| Free tier | ||
| Data-center locations | ||
| Regions | Netherlands, Sweden, France, Germany, UK, US, Canada, Brazil, South Africa, Japan, Singapore, Australia | null (CDN-fronted global distribution; facility list not published) |
| Tags | ||
| Tags | free tiermanaged optioneu datacenterus datacenterapac datacenter | free tierapi access |
| Visit Fly Machines → | Visit Docker Hub → | |
Fly Machines
Pros
- + ~300ms VM boot with automatic stop when idle — real scale-to-zero economics for request-driven workloads
- + Billed by the second with a fully published rate card; smallest Machine $2.19/30 days running
- + Low-level lifecycle control via REST API: create, start, stop, clone, update, destroy per VM
- + 17 regions on Fly's own hardware with per-Machine region placement
- + Fast restart from stopped state — assembled rootfs stays on the worker host
Cons
- - Fly.io-only API and infrastructure — no orchestration portability
- - Running the raw API means building your own scaling, placement retry and health logic
- - Always-on and idle costs accumulate: stopped rootfs $0.15/GB/month, volumes $0.15/GB/month, dedicated IPv4 $2/month
- - Capacity limits per region and host can make Machine placement fail
- - No free tier — only a 2-VM-hour/7-day trial — and no uptime SLA outside Enterprise plans
Docker Hub
Pros
- + The ecosystem default since 2013: 15M+ images, 16B+ monthly pulls, and 181 curated Docker Official Images
- + Real free tier (Docker Personal): unlimited public repos, 1 private repo, 200 pulls/6h authenticated
- + Pro at $9/month annual (unlimited pulls, unlimited private repos) is good value for individual developers
- + Published, specific usage limits and fair-use policy in official docs; SOC 2 Type 2 and ISO 27001 on paid tiers
- + Integrated tooling: Scout vulnerability analysis, Notary signing, Hardened Images with SBOMs and SLSA provenance
- + Team tier adds Hub RBAC, audit logs, and scoped org tokens for real collaboration
Cons
- - Pull rate limits on free tiers break CI on shared runner IPs; the fix is per-seat pricing that scales with headcount
- - 2026 price increases (Pro +80%, Team +67% over prior rates) landed on existing customers at renewal
- - No uptime SLA for Hub itself — only support response times (5/2/1 business days by tier)
- - Per-seat Team/Business pricing is expensive versus GHCR, ECR, or self-hosted Harbor at department scale
- - Free private repo capped at 1 (2 GB); autobuilds and serious security tooling are paid features
- - Real incident history: 2019 Hub database breach (~190k accounts) — supply-chain concentration risk is inherent
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