Can I open-source Fly.io?
YES · mature open-source replacementYes. Coolify (57k stars), Dokploy (36k stars), Dokku (32k stars) are mature open-source replacements for Fly.io — self-host with real ops work and stop paying.
People still pay for Fly.io because hosting products sell an operations team and failure-domain diversity, not merely a deploy button. The recurring cost buys patching, certificates, isolation, secrets, builds, deploys, logs, metrics, backups, capacity, incidents, and security response, not just the visible interface.
xglobal edge compute, anycast networking, orchestration, volumes, and platform operations
xglobal edge network
xmanaged databases
xautoscaling
xDDoS protection, support, and compliance
These projects already replace it, free.
CCoolifyOne-server container hosting with Git deploys, TLS, logs, limits, and a dashboard you can understand.open source↗DDokployA newer self-hosted PaaS for apps and databases, with previews, TLS, logs, and backups in the same control plane.open source↗DDokkuThe original tiny Heroku-on-one-box; excellent once you are comfortable treating a server like a pet.open source↗What each one is, in full: Coolify · Dokploy · Dokku
all 3 open-source alternatives to Fly.io →· no votes, no pay-to-list · just what's real
Fly.io pricing
| plan | monthly | annual (per mo) | what you get |
|---|---|---|---|
| pay as you go | custom | — | Per-second Machines billing; published 30-day examples include shared-cpu-1x at $2.02 for 256 MB, $3.32 for 512 MB, $5.92 for 1 GB and $11.11 for 2 GB. |
free tierno free tier for new organizations; legacy free allowances may survive only on older accounts
billingmonthly pay as you go with per-second resource billing; no annual plan
hidden costsRAM above the bundled amount is roughly $5/GB per 30 days; volumes, snapshots, dedicated IPs and network egress are separate. Optional support costs $29/month Standard, $199/month Premium or at least $2,500/month Enterprise; Fly Kubernetes starts at $75/cluster/month plus resources.
verified 2026-08-14 · source ↗
Can I open-source Fly.io?
Yes. Coolify replaces Fly.io today — self-host it on your own server or machine with no subscription. The full list of open-source alternatives is on this page.
How much does Fly.io cost?
Fly.io's pricing is usage-based or varies by plan · No stable monthly plan; pricing is usage based..
What do I lose by replacing Fly.io?
Honestly: global edge compute, anycast networking, orchestration, volumes, and platform operations; global edge network; managed databases; autoscaling; DDoS protection, support, and compliance. If any of those are load-bearing for you, keep paying.
Is there an open-source alternative to Fly.io?
Yes: Coolify (One-server container hosting with Git deploys, TLS, logs, limits, and a dashboard you can understand.) Dokploy (A newer self-hosted PaaS for apps and databases, with previews, TLS, logs, and backups in the same control plane.) Dokku (The original tiny Heroku-on-one-box; excellent once you are comfortable treating a server like a pet.) All 3 curated open-source alternatives are at caniopensourceit.online/fly-io/alternatives.