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Online Rust Compiler and Playground

Browser-based compiler and playground for Rust — Progsity IDE.

About Rust

Rust delivers memory safety without a garbage collector—ownership, borrowing, and lifetimes are checked at compile time. This Rust playground is ideal for learning Result and Option, iterators, and small CLI tools before you tackle Cargo projects locally.

When code fails to compile, Rust error messages are famously helpful—read the suggestion text in the compile output tab. Runtime panics show up in stderr with a backtrace when enabled.

Great for systems-curious developers and competitive programmers who want predictable performance characteristics.

How to use

  1. Write fn main() in a single file. Use println! for output.
  2. For stdin, use std::io helpers; paste test input in the stdin panel.
  3. Fix compile errors before expecting output—Rust refuses to run unsafe code.

FAQ

Is Rust free to run?›

Yes. Compilation and runs are free; storage limits may apply to saved snippets.

Which Rust edition?›

The sandbox uses a modern rustc. If a feature fails, check edition and crate availability.

Can I use Cargo.toml?›

Single-file playground only—no custom dependency graphs in Phase 1.

Save Rust code?›

Yes after sign-in.

Compiler vs playground?›

Rust is compiled; you still iterate quickly like a playground once errors are fixed.

Related languages

Code examples

Tap “Try this” to load sample code into the editor above.

  • Iterator sum

    fn main() {
    let v = vec![1, 2, 3, 4];
    let s: i32 = v.iter().sum();
    println!("{}", s);
}

  • parse Result

    fn main() {
    let n: i32 = "42".parse().expect("parse");
    println!("{}", n + 1);
}

  • String vs &str

    fn greet(name: &str) -> String {
    format!("Hello, {}!", name)
}

fn main() {
    println!("{}", greet("Progsity"));
}

  • 1..=n

    fn main() {
    for i in 1..=5 {
        print!("{} ", i);
    }
    println!();
}