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Fedora CoreOS vs Flatcar Container Linux: catalog facts
Fedora CoreOS	Flatcar Container Linux
Free Free and open source, developed by the Fedora community.	Free Free and open source, supported by project sponsors.
Linux, Self-hosted	Linux, Self-hosted
Automatic updates Minimal image focused on containers	Read-only, immutable filesystem reduces the attack surface Automatic atomic updates
Not a general-purpose or desktop system Provisioning works differently from a traditional server install	No package manager, so extra software must run in containers Not intended as a general-purpose or desktop system
Operating system	Operating system
Open source	Open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.