created_at2020-08-21 11:45:39.502308
updated_at2024-05-13 21:08:49.515846
descriptionThe Leo programming language



The Leo Programming Language

Leo is a functional, statically-typed programming language built for writing private applications.

Table of Contents

🍎 Overview

Welcome to the Leo programming language.

Leo provides a high-level language that abstracts low-level cryptographic concepts and makes it easy to integrate private applications into your stack. Leo compiles to circuits making zero-knowledge proofs practical.

The syntax of Leo is influenced by traditional programming languages like JavaScript, Scala, and Rust, with a strong emphasis on readability and ease-of-use. Leo offers developers with tools to sanity check circuits including unit tests, integration tests, and console functions.

Leo is one part of a greater ecosystem for building private applications on Aleo. The language is currently in an alpha stage and is subject to breaking changes.

⚙️️ Build Guide

🦀 Install Rust

We recommend installing Rust using rustup. You can install rustup as follows:

  • macOS or Linux:

    curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
  • Windows (64-bit):

    Download the Windows 64-bit executable and follow the on-screen instructions.

  • Windows (32-bit):

    Download the Windows 32-bit executable and follow the on-screen instructions.

🐙 Build from Source Code

We recommend installing Leo by building from the source code as follows:

# Download the source code
git clone https://github.com/AleoHQ/leo
cd leo

# Install 'leo'
$ cargo install --path .

Now to use leo, in your terminal, run:


🦁 Update from Leo

You can update Leo to the latest version using the following command:

leo update

Now to check the version of leo, in your terminal, run:

leo --version

📦 Download using Cargo

You can also install Leo directly from crates.io using cargo:

cargo install leo-lang

Now to use leo, in your terminal, run:


🚀 Quick Start

Use the Leo CLI to create a new project

# create a new `hello-world` Leo project
leo new helloworld
cd helloworld

# build & setup & prove & verify
leo run main 0u32 1u32

The leo new command creates a new Leo project with a given name.

The leo run command will compile the program into Aleo instructions and run it.

Congratulations! You've just run your first Leo program.

🧰 Troubleshooting

If you are having trouble installing and using Leo, please check out our guide.

If the issue still persists, please open an issue.

📖 Documentation

🤝 Contributing

Please see our guidelines in the developer documentation

❤️ Contributors

View all Leo contributors here.

🛡️ License

License: GPL v3

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cargo fmt