Scastie

Spec sheet

Purpose

Scastie is an interactive Scala playground described as sbt in your browser.Read 11 Oct 2026 · github.com

Audience

Scala's official Getting Started page recommends Scastie in a browser for people who want to start experimenting with Scala right away.Read 11 Oct 2026 · scala-lang.org

Free plan

YesRead 22 Sep 2026 · scastie.scala-lang.org

Integrations

The privacy policy says Scastie uses GitHub login for authentication and avatars, Plausible for analytics, and Sentry for error monitoring.Read 11 Oct 2026 · github.com

Support

The Scastie project README says it is supported by the Scala Center.Read 11 Oct 2026 · github.com

Headquarters

Lausanne, SwitzerlandRead 19 Oct 2026 · scastie.scala-lang.org

Founded

2017Read 19 Oct 2026 · scastie.scala-lang.org

Deployment options

noneRead 22 Sep 2026 · scastie.scala-lang.org

Embed customization

Embedded snippets support light or dark themes, customizable CSS, and options such as worksheet mode, target type, Scala version, and sbt configuration.Read 11 Oct 2026 · github.com

Execution

When code is evaluated, the browser sends its input to Scastie servers, where code runs in an isolated Java Virtual Machine and output is streamed back.Read 11 Oct 2026 · github.com

Libraries

Users can search the Scala ecosystem through an integrated Scaladex interface and include published Scala libraries.Read 11 Oct 2026 · github.com

Notable limits

The README says setting Scala Native as an embed target type and setting the Scala.js version are not yet supported.Read 11 Oct 2026 · github.com

Privacy and logs

The project's privacy policy says access logs include snippet ID, user IP address, and GitHub login, and are stored for one year.Read 11 Oct 2026 · github.com

Scala versions and backends

It supports any Scala version and alternate backends including Scala 3, Scala.js, Scala Native, and Typelevel Scala.Read 11 Oct 2026 · github.com

Security and data

The privacy policy says stored data is encrypted, connections use SSL, and stored data is kept for up to one year after last access on servers at EPFL.Read 11 Oct 2026 · github.com

Sharing and embedding

Users can share Scala programs and embed saved or generated snippets in websites and library guides.Read 11 Oct 2026 · github.com

Sharing controls

public_onlyRead 22 Sep 2026 · scastie.scala-lang.org

Worksheet mode

Worksheet mode supports top-level expressions and displays each evaluated expression's value and type alongside the code.Read 11 Oct 2026 · github.com

Plans and prices

Every Scastie plan and price →

Where Specifiction places it

• Coding Playgrounds#109 of 1387.5