Fly.io runs applications as fast-launching virtual machines in regions worldwide, billed by usage. Pages here cover moving apps to self-hosted Coolify or Dokku on servers you control.
Comparing Fly.io Machines spread across regions with Coolify managing your own servers over SSH: Dockerfile and buildpack builds, volumes and databases, multi-region placement against Coolify's multi-server limits, TLS, and usage billing against fixed server costs.
Fly.io against Dokku on a single server or a K3s cluster: Dockerfile and Cloud Native Buildpacks builds, process types, release commands, Postgres through plugins, and what Dokku cannot do that Fly.io's regional Machines do.
Moving Fly.io apps to Coolify: translating fly.toml (build, services, processes, checks, release commands and mounts), reusing the Dockerfile or buildpack builder, moving volumes and Postgres data, and replacing per-region placement.
Cost of ownership by component: Fly.io Machine, volume, snapshot, egress, IPv4, certificate and support plan charges, against servers running free self-hosted Coolify and the operating time that self-hosting adds.
Replacing Fly.io Managed Postgres, priced from the Basic to the Performance plan plus storage, with PostgreSQL you run: Coolify or Dokku databases with S3 backups for small apps, or CloudNativePG or Patroni for failover.
Fly.io lists five European regions among its 17. This page covers when that is enough for EU data residency and when teams instead run apps and data in EU infrastructure they choose with Coolify or Dokku, and what multi-region placement they give up.
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