Scastie

Free plan

What the maker publishes

Audience

Scala's official Getting Started page recommends Scastie in a browser for people who want to start experimenting with Scala right away. source

Deployment options

none source

Embed customization

Embedded snippets support light or dark themes, customizable CSS, and options such as worksheet mode, target type, Scala version, and sbt configuration. source

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. source

Free plan

Yes source

Integrations

The privacy policy says Scastie uses GitHub login for authentication and avatars, Plausible for analytics, and Sentry for error monitoring. source

Libraries

Users can search the Scala ecosystem through an integrated Scaladex interface and include published Scala libraries. source

Notable limits

The README says setting Scala Native as an embed target type and setting the Scala.js version are not yet supported. source

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. source

Purpose

Scastie is an interactive Scala playground described as sbt in your browser. source

Scala versions and backends

It supports any Scala version and alternate backends including Scala 3, Scala.js, Scala Native, and Typelevel Scala. source

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. source

Sharing controls

public_only source

Sharing and embedding

Users can share Scala programs and embed saved or generated snippets in websites and library guides. source

Support

The Scastie project README says it is supported by the Scala Center. source

Worksheet mode

Worksheet mode supports top-level expressions and displays each evaluated expression's value and type alongside the code. source

Checked against the maker's pages on 11 Oct 2026.