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Flatcar Container Linux vs Photon OS: catalog facts
Flatcar Container Linux	Photon OS
Free Free and open source, supported by project sponsors.	Free Free and open source.
Linux, Self-hosted	Linux
Read-only, immutable filesystem reduces the attack surface Automatic atomic updates	Small footprint suited to container hosts Images for x86, ARM64, Raspberry Pi and major clouds
No package manager, so extra software must run in containers Not intended as a general-purpose or desktop system	Aimed at servers and appliances, not desktop use Best integrated with VMware environments
Operating system	Operating system
Open source	Open source
License not stated	License not stated
Not stated if an account is needed	No account 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.