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What is Woz?

Woz is a progressive WebAssembly app (PWAA) generator for Rust.


See for the latest docs.


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 | sh -s -- --target x86_64-apple-darwin

For linux (via musl):

curl -LSfs | sh -s -- --target x86_64-unknown-linux-musl

For bsd:

curl -LSfs | sh -s -- --target x86_64-unknown-freebsd
curl -LSfs | sh -s -- --target x86_64-unknown-netbsd


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

curl -LSfs | 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


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.

You can also build Woz so that it can use your AWS account and allow multiple users to securely deploy apps to a shared S3 bucket. See for the latest docs.


Eclipse Public License 1.0 (EPL-1.0)