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An interactive scratchpad for the JVM — run Kotlin, Java, Groovy, and Scala instantly, with rich output, database access, and a debugger. Windows 10 and 11, and Linux.

Download Setup.exe — v1.0.99MSI for enterprise (Group Policy)
Linux: .deb for Debian and Ubuntu (64-bit)install with sudo apt install ./byterunner_1.0.99_amd64.deb

v1.0.99 · October 4, 2026 · code-signed for Windows ·Release notes ·All versions

Already have ByteRunner? You don't need this download. In ByteRunner, chooseHelp → Check for Updates → Update now: it downloads the new version, checks it's the genuine signed installer, and reopens, with no installer prompts. (Update now arrived in 1.0.72; on an older version, run Setup.exe once and chooseUpdate.)
Nothing else to install. ByteRunner bundles its own JDK 21 runtime, so compiling, running, and debugging work out of the box. Installers are code-signed asChristian Oleson and should only ever come from this site or theByteRunner-releases GitHub repo.