WASM-4

Spec sheet

Purpose

WASM-4 is a low-level fantasy game console for building small games with WebAssembly.Read 12 Oct 2026 · wasm4.org

Audience

The project is intended for developers who want to build small games and experiment with programming languages that compile to WebAssembly.Read 12 Oct 2026 · wasm4.org

Free plan

YesRead 24 Sep 2026 · wasm4.org

Audio

The sound system has four channels: two pulse wave, one triangle wave, and one noise channel.Read 12 Oct 2026 · wasm4.org

CLI

The `w4` command can create projects, run games, watch for code changes, and bundle cartridges.Read 12 Oct 2026 · wasm4.org

Community

The site describes WASM-4 as supported by a community of creators and provides a public catalog of user-built games and experiments.Read 12 Oct 2026 · wasm4.org

Design limits

Games use a 160×160 pixel display with four customizable colors, 64 KB of linear RAM, and a 64 KB cartridge size limit.Read 12 Oct 2026 · wasm4.org

Desktop downloads

The setup guide links downloads for Windows, macOS, and Linux and says the package includes the `w4` command.Read 12 Oct 2026 · wasm4.org

Development tools

The downloadable package includes the w4 command for creating projects and running games locally, and w4 can also be installed with npm.Read 12 Oct 2026 · wasm4.org

Display

The display is 160×160 pixels with four customizable colors and updates at 60 Hz.Read 12 Oct 2026 · wasm4.org

Distribution

The CLI bundles games as standalone HTML files or native Windows, macOS, and Linux executables; the HTML bundle works offline without external dependencies.Read 12 Oct 2026 · wasm4.org

Hardware limits

The specifications list 64 KB linear RAM, a 64 KB cartridge size limit, and 1024 bytes of disk storage.Read 12 Oct 2026 · wasm4.org

Input

Input supports keyboard, mouse, touchscreen, and up to four gamepads.Read 12 Oct 2026 · wasm4.org

Languages

Cartridges are self-contained .wasm files that can be built with any programming language that compiles to WebAssembly.Read 12 Oct 2026 · wasm4.org

Multiplayer

WASM-4 supports real-time multiplayer for up to four players locally or online, with online play using WebRTC and rollback netcode.Read 12 Oct 2026 · wasm4.org

Native builds

The documentation says games can be bundled as Windows, Mac, and Linux executables that run without a web browser.Read 12 Oct 2026 · wasm4.org

Netplay limits

Mouse input, save/load states, and cartridge reset are disabled during netplay, which the guide says may still have bugs.Read 12 Oct 2026 · wasm4.org

Online multiplayer

WASM-4 supports real-time multiplayer for up to four players locally or online, with netplay using WebRTC and rollback netcode.Read 12 Oct 2026 · wasm4.org

Publishing

Creators can submit a pull request to feature a game on wasm4.org, and games on the site are under Creative Commons BY-NC-SA unless the license holder releases them elsewhere under another license.Read 12 Oct 2026 · wasm4.org

Save data

Games can persist up to 1024 raw bytes; web runtime saves use browser localStorage, while native runtime saves to a file beside the game.Read 12 Oct 2026 · wasm4.org

Saving

Games can persist up to 1,024 bytes between sessions; the web runtime stores this in domain-bound browser localStorage, and the native runtime stores it in a file beside the game.Read 12 Oct 2026 · wasm4.org

Security and compliance

The official pages opened did not state security certifications or compliance claims.Read 12 Oct 2026 · wasm4.org

Source code model

open_sourceRead 24 Sep 2026 · wasm4.org

Supported downloads

The setup page provides downloads for Windows, macOS, and Linux.Read 12 Oct 2026 · wasm4.org

Target platforms

web,Windows,macOS,LinuxRead 24 Sep 2026 · wasm4.org

Plans and prices

Every WASM-4 plan and price →

Where Specifiction places it

• Game Engine Software#45 of 928.3