Side by side

CodeKit vs Mill

Both stand on build automation software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

CodeKit

Free trial Mac

CodeKit combines file compilation, asset optimization, browser preview, and build controls in one macOS app. Its broad language support and AI command-line tools may suit developers who want these tasks together, while framework-specific servers remain separate.

Visit CodeKit

Mill

Paid LinuxMacWindows

Mill provides a broad build workflow with caching, parallel execution, integrations, and multi-platform support. Teams should note the Windows ARM limitation, Kotlin editor guidance, and absence of remote execution.

Visit Mill

The facts

	CodeKit	Mill
Free plan	A free trial	Not published
Open source	Not published	Not published
Runs on	Mac	Linux, Mac, Windows
Lowest paid plan	CodeKit single-user license: $39, paid once	Not published
Plans published	1	None
Maker	Not published	Not published
Website	codekitapp.com	mill-build.org
On build automation software	#36 of 42	#40 of 42

CodeKit: what it does well

Compiles many stylesheet, script, markup, and data languages
Built-in browser previews support synchronized interactions
Graphical npm interface and framework installers
AI command-line interface can run builds and read logs
Works alongside any editor that saves files

What to know first

Runs only on macOS 13.5 or later
No free plan; license costs $39, paid once
Trial becomes read-only for settings after 10 days
Not a replacement for frameworks' own development servers

Mill: what it does well

Free and open source
Supports Java, Scala, and Kotlin
Caches and parallelizes build tasks
Includes dependency locking and build caching
Works across Linux, macOS, and Windows

What to know first

Remote execution is not supported
Windows ARM native launcher is unsupported
VSCode Kotlin users are advised to use IntelliJ
JVM launcher requires Java 17 or newer

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