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Rust Playground
What it is
Rust Playground is a free web environment for trying Rust before local installation or when a compiler is unavailable. Its syntax-highlighted editor compiles code in debug or release mode with the stable, beta, or nightly Rust channel. Available crates include the top 100 by all-time downloads, Rust Cookbook crates, and their dependencies, though some candidates may be excluded for Linux or stable-Rust compilation issues or invalid feature selections. Users can run rustfmt and Clippy, inspect LLVM IR, assembly, or Rust MIR, and load or save code through GitHub Gist. Rust documentation and mdbook examples can link code to the Playground for running or editing. Docker containers provide and isolate compilers and tools. Compilation and execution have no outside network access and are limited by memory and total time. Recent code is saved in browser local storage shared across windows. The project uses Apache License 2.0 or MIT. The free plan costs nothing.
For and against
For
- Free web-based Rust environment
- Supports stable, beta, and nightly channels
- Runs rustfmt and Clippy
- Displays LLVM IR, assembly, and MIR
- Shares code through GitHub Gist
Against
- Compilation and execution have time limits
- Memory is limited
- Compiler containers have no network access
- Some crates may be unavailable
The verdict
Rust Playground offers a broad set of Rust experimentation and inspection tools without local installation. Its sandbox limits network, memory, and execution time, so it is intended for bounded examples rather than unrestricted workloads.
Who it suits
Rust Playground suits learners and developers experimenting with Rust without a local compiler. It also helps documentation authors linking runnable examples.
Plans and prices
Free
Compilation and execution time limited · Memory limited · No network access during compilation or execution
Read 12 Oct 2026 · github.com
On the record
- Audience
- The Playground is for experimenting with Rust when a local installation or compiler is unavailable.github.com · read 12 Oct 2026
- Available crates
- It provides the top 100 crates by all-time downloads, Rust Cookbook crates, and their dependencies.github.com · read 11 Oct 2026
- Code persistence
- The most recently entered code is automatically saved in browser local storage, which is shared across windows as a single resource.play.rust-lang.org · read 12 Oct 2026
- Code tools
- Users can run rustfmt and Clippy and inspect LLVM IR, assembly, or Rust MIR.github.com · read 11 Oct 2026
- Compiler output
- It can display LLVM IR, assembly, or Rust MIR for source code.github.com · read 12 Oct 2026
- Crate availability
- Some otherwise eligible crates may be excluded if they do not compile on Linux or stable Rust, or have invalid feature flag selections.github.com · read 12 Oct 2026
- Crates
- It includes the top 100 crates by all-time downloads, crates from the Rust Cookbook, and their dependencies.github.com · read 12 Oct 2026
- Deployment options
- noneplay.rust-lang.org · read 22 Sep 2026
- Disk limitation
- The project README says its sandbox has no disk space limits and recommends limiting the temporary directory when running a server.github.com · read 11 Oct 2026
- Editor
- It provides a browser editor with syntax highlighting.github.com · read 12 Oct 2026
- Full-stack runtime
- Noplay.rust-lang.org · read 22 Sep 2026
- Gist setup
- For a self-hosted server, a GitHub token must be configured to load and save gists.github.com · read 11 Oct 2026
- Integration
- Rust documentation and mdbook examples can link code to the Playground for users to run or edit.dev-doc.rust-lang.org · read 12 Oct 2026
- Integrations
- The interface uses React, the backend uses Axum, and code sharing uses GitHub Gist.github.com · read 11 Oct 2026
- Isolation
- Docker containers provide compilers and tools and help isolate them; compiler containers have no network connection to the outside world.github.com · read 12 Oct 2026
- Network limit
- Compiler containers have no network connection to the outside world.github.com · read 11 Oct 2026
- Open source
- The repository is licensed under Apache License 2.0 or MIT, at the user's option.github.com · read 11 Oct 2026
- Purpose
- The Playground lets people experiment with Rust before installing it locally or when a compiler is unavailable.github.com · read 12 Oct 2026
