Leo is a functional, statically-typed programming language built for writing private applications.
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.
Leo is one part of a greater ecosystem for building private applications on Aleo. If your goal is to build a user experience on the web that is both truly personal and truly private, then we recommend downloading the Aleo Studio IDE and checking out the Aleo Package Manager.
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
Download the Windows 64-bit executable and follow the on-screen instructions.
Download the Windows 32-bit executable and follow the on-screen instructions.
We recommend installing Leo this way. In your terminal, run:
cargo install leo-lang
Now to use Leo, in your terminal, run:
Alternatively, you can install Leo by building from the source code as follows:
# Download the source code git clone https://github.com/AleoHQ/leo cd leo # Build in release mode $ cargo build --release
This will generate an executable under the
./target/release directory. To run Leo, run the following command:
Use the Leo CLI to create a new project
# create a new `hello_world` Leo project leo new hello_world cd hello_world # build & setup & prove & verify leo run
leo new command creates a new Leo project with a given name.
leo run command will compile the main program, generate keys for a trusted setup, fetch inputs, generate a proof and verify it.
Congratulations! You've just run your first Leo program.
Please see our guidelines in the developer documentation
Thank you for helping make Leo better!