What it is

sbt is an interactive build tool for Scala, Java, and more. It lives in the Scala ecosystem and is maintained under the Apache-2.0 license at scala-sbt.org. The sbt/sbt repository hosts the build tool modules, while related code is split across sbt/io and sbt/zinc. It is categorized as Developer Tools / Build & Deployment.

The concrete problem it solves is the need for a build tool that can build Scala and Java projects, manage incremental Scala compilation through Zinc, and support interactive use. Zinc, hosted separately, supplies an incremental compiler for Scala, so builds can avoid recompiling every source file when only part of the project changes. The README points to Setup, FAQ, Discord, and Stack Overflow, showing the tool is intended for active project work. The repository has 4952 stars, 1046 forks, and 498 open issues, and it has existed for 17 years with a last push recorded on 2026-09-15.

Key capabilities

• sbt builds Scala, Java, and more.
• It supports interactive use, as stated in the tagline and README.
• It relies on Zinc, an incremental compiler for Scala hosted in sbt/zinc.
• It has a separate sbt/io module hosted in sbt/io.
• The current series is sbt 2.x, with source split across several repositories.
• The project links to Setup for the latest binary release.
• The project links to FAQ, Discord, and Stack Overflow for help.

Who uses it and how

• Scala and Java developers use sbt as a build tool for projects in the Scala ecosystem.
• Users interact with it during development, as indicated by the tagline.
• Teams on sbt 2.x track changes across sbt/sbt, sbt/io, and sbt/zinc.
• Contributors use CONTRIBUTING, good first issue, and help wanted labels.
• Users seek help through the sbt Discord channel, Stack Overflow tag, and FAQ.

Getting started

Users follow the Setup link, which describes getting started with the latest binary release. The README lists no Docker image, package manager, or hosted service.

When to use it — and when not to

sbt fits Scala or Java projects that need an interactive build tool and incremental Scala compilation through Zinc. It is less convenient for teams wanting one repository or a hosted service, because the implementation is split across sbt/sbt, sbt/io, and sbt/zinc. The 498 open issues also mean users should expect a large active queue rather than a small resolved backlog.