The modern build system for Arma 3 mods

HEMTT is a powerful, opinionated build system designed as a modern replacement for tools like Addon Builder and pboProject. It streamlines Arma 3 mod development by providing fast, reliable builds with built-in linting, scripting capabilities, and seamless CI/CD integration.

• Fast, Parallel Builds - Build large mods efficiently with multi-threaded processing
• Comprehensive Linting - Catch errors early with built-in checks for SQF, configs, and stringtables
• Powerful Scripting - Extend HEMTT with Rhai scripts for custom build hooks and workflows
• Smart Utilities - Built-in tools for PAA conversion, audio processing, config inspection, and more
• VSCode Integration - First-class IDE support with the official HEMTT VSCode extension (alpha)
• GitHub Integration - Native support for GitHub Actions and easy CI/CD workflows
• PAA Viewer - Browser extension to preview .paa files directly on GitHub
• Best Practices First - Opinionated design that encourages modern modding workflows

HEMTT is supported on Windows, Linux, and macOS. Follow the instructions on the installation page to get started.

Add HEMTT to an existing mod or create a new one with:

hemtt new my-awesome-mod
cd my-awesome-mod

# Check for errors without building
hemtt check

# Development build
hemtt dev

# Release build
hemtt release

hemtt launch

HEMTT has a powerful launch system that can start Arma 3 with your mod loaded, along with any additional mods or parameters you specify in your configuration. Easily test compatibility with other mods and CDLCs.

Everything you need is available at hemtt.dev

• Installation & Setup
• Project Configuration
• All Commands
• Hook Scripting
• Linting Rules

• Audio processing (inspect, convert, compress)
• PAA/P3D conversion and inspection
• Config derapification
• PBO extraction and unpacking
• SQF formatting

Automatically build and release your mod on every push:

name: Build

on: [push]

jobs:
    build:
        runs-on: ubuntu-latest
        steps:
            - uses: actions/checkout@v2
            - name: Setup HEMTT
              uses: arma-actions/hemtt@v1
            - name: Run HEMTT build
              run: hemtt release
            - name: Upload Release
              uses: actions/upload-artifact@v4
              with:
                  name: my-mod-latest
                  path: release/my-mod-latest.zip

View .paa files directly on GitHub!

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Have questions? Join #hemtt in the ACE3 Discord to connect with other modders and get help.

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