SwiftFiddle

SwiftFiddle is an online playground for creating, sharing, and embedding Swift fiddles

SwiftFiddle is an online playground for creating, sharing, and embedding Swift fiddles — small Swift programs that run directly in your browser. A “fiddle” in programming slang is a quick, disposable code snippet used to test an idea, demonstrate behavior, reproduce a bug, or share a minimal example.

The project is open source. Its main repository is at github.com/SwiftFiddle/swiftfiddle-web, licensed under MIT and maintained by the SwiftFiddle organization. Contributors have been active on the codebase for years, and the playground shows up in community links as early as 2023.

You can use SwiftFiddle at https://swiftfiddle.com, where you pick a Swift version, write code, and run it in the browser. Because all versions execute on the same Linux/ICU environment, Unicode behavior — including String equality and canonical equivalence — is consistent across tests.

SwiftFiddle is useful for:

• sharing minimal reproducible examples

• quickly experimenting with language features

• embedding runnable Swift snippets in docs or discussions