Rust Playground

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What Rust Playground is

Rust Playground is a free web tool for experimenting with Rust when a local installation or compiler is unavailable. Its editor highlights syntax, and users can compile in debug or release mode against the stable, beta, or nightly Rust channel. The available crates include the top 100 by all-time downloads, crates from the Rust Cookbook, and their dependencies. Some otherwise eligible crates are excluded if they do not compile on Linux or stable Rust, or have invalid feature flag selections. Users can run rustfmt and Clippy, then inspect LLVM IR, assembly, or Rust MIR. Code can be loaded from or saved to a GitHub Gist and shared; Rust documentation and mdbook examples can also link code for running or editing. Docker containers provide the compilers and tools and help isolate them. Compilation and execution have no outside network connection, and container memory and total compilation and execution time are limited. The latest entered code is automatically saved in browser local storage, shared across windows as one resource. The project is open source under Apache License 2.0 or MIT, at the user’s option. The repository documents building and running a self-hosted server and downloading its compiler containers; a GitHub token is needed there to load and save Gists.

Who it suits

Rust Playground suits people who want to try Rust without installing it locally or who do not have access to a compiler. It also serves readers of Rust documentation and mdbook examples that link code for running or editing.

What it does well

Compiles with stable, beta, or nightly Rust.
Includes rustfmt, Clippy, and compiler-output inspection.
Code can be shared through GitHub Gist.
Documentation and mdbook examples can link to Playground code.
Open source under Apache License 2.0 or MIT.

What to know first

Compilation and execution have no outside network access.
Memory and compilation and execution time are limited.
Some eligible crates are excluded by platform, compiler, or feature constraints.
Self-hosted Gist access requires a GitHub token.

Limits

The free plan costs nothing. Compilation and execution time and memory are limited, and the containers have no outside network access. Some crates are unavailable because they fail Linux or stable-Rust compilation or have invalid feature selections.

Plans

Plan	Billed and limits	Price
Free	Compilation and execution time limited · Memory limited · No network access during compilation or execution	Free

As play.rust-lang.org lists them, read 12 Oct 2026. The maker's own page has the final word.

Getting started

Visit https://play.rust-lang.org/.
Enter Rust code in the syntax-highlighted editor.
Choose debug or release mode and the stable, beta, or nightly channel.
Run the code, rustfmt, or Clippy, or inspect LLVM IR, assembly, or Rust MIR.
Load or save code through a GitHub Gist to share it.
For self-hosting, follow the project’s documented build and server setup and configure a GitHub token for Gist access.

Verdict

Choose Rust Playground for quick Rust experiments in a browser, or to run and edit code linked from Rust documentation. Its compiler channels, code tools, and Gist sharing support exploration without a local compiler. Look elsewhere for execution that needs outside network access or avoids container memory and time limits.

Questions

Does Rust Playground cost anything?

The Free plan costs nothing.

Which Rust versions can I use?

Code can be compiled in debug or release mode against the stable, beta, or nightly Rust channel.

Can I share code?

Yes. Code can be loaded from or saved to a GitHub Gist and shared.

Is Rust Playground open source?

Yes. The repository is licensed under Apache License 2.0 or MIT, at the user’s option.

Can I run it on my own server?

The project documents how to build and run the server and download compiler containers. A GitHub token is required to load and save Gists on a self-hosted server.

What are the execution limits?

Compilation and execution have no outside network connection, and container memory and total compilation and execution time are limited.

Facts from Rust Playground's own pages

Audience: The Playground is for experimenting with Rust when a local installation or compiler is unavailable. · github.com, 12 Oct 2026
Available crates: It provides the top 100 crates by all-time downloads, Rust Cookbook crates, and their dependencies. · github.com, 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, 12 Oct 2026
Code tools: Users can run rustfmt and Clippy and inspect LLVM IR, assembly, or Rust MIR. · github.com, 11 Oct 2026
Compiler output: It can display LLVM IR, assembly, or Rust MIR for source code. · github.com, 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, 12 Oct 2026
Crates: It includes the top 100 crates by all-time downloads, crates from the Rust Cookbook, and their dependencies. · github.com, 12 Oct 2026
Deployment options: none · play.rust-lang.org, 22 Sept 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, 11 Oct 2026
Editor: It provides a browser editor with syntax highlighting. · github.com, 12 Oct 2026
Free plan: Yes · play.rust-lang.org, 22 Sept 2026
Full-stack runtime: No · play.rust-lang.org, 22 Sept 2026
Gist setup: For a self-hosted server, a GitHub token must be configured to load and save gists. · github.com, 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, 12 Oct 2026
Integrations: The interface uses React, the backend uses Axum, and code sharing uses GitHub Gist. · github.com, 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, 12 Oct 2026
Network limit: Compiler containers have no network connection to the outside world. · github.com, 11 Oct 2026
Open source: The repository is licensed under Apache License 2.0 or MIT, at the user's option. · github.com, 11 Oct 2026
Purpose: The Playground lets people experiment with Rust before installing it locally or when a compiler is unavailable. · github.com, 12 Oct 2026
Resource limits: Compiler and executable memory use and total compilation and execution time are limited by the container. · github.com, 12 Oct 2026
Rust channels: Code can be compiled in debug or release mode against stable, beta, or nightly Rust. · github.com, 12 Oct 2026
Rust versions and modes: Users can compile in debug or release mode with the current stable, beta, or nightly Rust channel. · github.com, 11 Oct 2026
Security reporting: The Playground follows the Rust organization’s security reporting procedures for vulnerability reports. · github.com, 12 Oct 2026
Self-hosting: The project documents how to build and run the server and download its compiler containers; a GitHub token is required to load and save Gists on a self-hosted server. · github.com, 12 Oct 2026

Where Rust Playground stands on Freedom251

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