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Kill Bill vs FOSSBilling: catalog facts
Kill Bill	FOSSBilling
Freemium The open-source core is free to self-host; managed and supported offerings are paid.	Free Free and open source under the Apache 2.0 licence, funded by donations.
Self-hosted	Web, Self-hosted
Long-running project used in production for many years Modular design with a plugin framework	Automatic provisioning on common hosting control panels Domain management and built-in ticketing
Aimed at developers integrating billing, not at non-technical users Running and scaling the deployment is your responsibility	Still in beta with limited support Aimed mainly at hosting businesses
Self-hosted	Self-hosted
Open source	Open source
License: Apache-2.0	License: Apache-2.0
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 October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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