What is Woz?

Woz is a is a progressive WebAssembly app (PWAA) generator for Rust. Apps can be installed to your home screen and shared with a hyperlink.


Before we begin you must have a recent version of Rust installed as well as wasm-bindgen.

Install wasm-bindgen

Woz uses wasm-bindgen to generate the interop calls between WebAssembly and JavaScript. This allows you to write the entire application in Rust—including rendering to the dom.

cargo install -f wasm-bindgen-cli

Install wasm compiler target

rustup target add wasm32-unknown-unknown

Install Woz

Install a pre-built binary.

For macOS (64 bit only):

curl -LSfs https://woz.sh/bin/install.sh | sh -s -- --target x86_64-apple-darwin

For linux (via musl):

curl -LSfs https://woz.sh/bin/install.sh | sh -s -- --target x86_64-unknown-linux-musl

For bsd:

curl -LSfs https://woz.sh/bin/install.sh | sh -s -- --target x86_64-unknown-freebsd
curl -LSfs https://woz.sh/bin/install.sh | sh -s -- --target x86_64-unknown-netbsd


To update to the latest version of woz run the following command.

curl -LSfs https://woz.sh/bin/install.sh | sh -s -- -f --target <NAME OF TARGET>

Setup and deploy

# Follow prompts to create a free account and deploy to the sandbox
woz signup
# Create a new app
woz new myapp && cd myapp
# Deploy it
woz deploy


The 'Seed' example app uses the seed framework and clocks in at ~600kb (including ~300kb for an icon and splashscreen), works offline, and can be installed to your homescreen on iOS or Android devices. You can try it out here


Woz.sh Sandbox

Due to the security requirements of PWAs and WebAssembly, the easiest way to start building a PWAA is to use the woz.sh sandbox. To create an account use woz signup and follow the prompts. If you already have an account use woz setup to set up your local computer with credentials. Then use woz deploy to deploy your app.


You can self-host by using woz to build your app locally and upload the files to your static file hosting service such as AWS S3.

Build the app locally:

cd myapp/
woz build

Follow the cli output to get the location of the generated app files on disk. It will look something like:

App package directory can be found at /Users/myusername/.woz/myapp/pkg

The app directory contains an index.html file that will be the entry point for running the app in a browser.

Note: the security requirements for PWAs and WebAssembly means you will need to serve the files over https. Browsing the files directly in the browser (e.g. file://) will result in security-related errors. Use a static file server and install an SSL certificate to be able to install the app to your home screen.

Multi-user AWS hosting

You can compile woz so that it uses your AWS account and allow for multiple users to securely deploy apps to a shared S3 bucket.

To do that, clone the Woz repo locally and put the following environment variables in a file:

# Scheme to use when constructing URLs to your app

# Domain to use links to your app

# Cognito identity pool to use for user registration
WOZ_USER_POOL_URL="cognito-idp.<REGION>.amazonaws.com/<USER POOL ID>"

# Cognito identity pool to use for authentication

# Cognito user pool app client to use for use with the CLI

# S3 bucket where static files will be stored

# Password used for encrypting tokens on disk

# Salt used for encrypting tokens on disk

# Location of the woz repo, needed to generate new projects

# Location of the woz repo, needed to include assets

In your terminal, add the environment variables to the session:

set -a; . ../my-env; set +a

You can now build and deploy to your own AWS account. For example:

cargo run setup
cargo run new myapp
cargo run deploy --project-root ./myapp

Open Source

Woz is open source and available on GitHub. Please share your suggestions and bug reports here.