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sbt vs Mill: catalog facts
sbt	Mill
Free Free and open source under the Apache 2.0 licence.	Free Free and open source under the MIT licence.
Windows, macOS, Linux, Command line	Windows, Command line
Incremental compilation with Zinc Cross-building against multiple Scala versions	Targets Java and Scala builds Command-line tool installable through Scoop
Build DSL has a learning curve Mainly useful for Scala and Java projects	Focused on JVM languages rather than general-purpose builds Another build tool for a team to learn alongside existing ones
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: MIT
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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