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Bottlerocket vs Flatcar Container Linux: catalog facts
Bottlerocket	Flatcar Container Linux
Free The OS is free; you pay only for the AWS infrastructure it runs on.	Free Free and open source, supported by project sponsors.
Linux, Self-hosted	Linux, Self-hosted
Single-step updates that can be rolled back Only the software required to run containers	Read-only, immutable filesystem reduces the attack surface Automatic atomic updates
Built mainly around AWS and EC2 Not a general-purpose operating system	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.