# LuaJIT

LuaJIT is a **Just-In-Time Compiler** (JIT) for the
[» Lua](https://www.lua.org/) programming language. Lua is a powerful, dynamic and light-weight programming language. It may be embedded or used as a general-purpose, stand-alone language.

LuaJIT is Copyright © 2005-2025 Mike Pall, released under the [» MIT open source license](https://www.opensource.org/licenses/mit-license.php).

## Compatibility

Supported platforms:

- Windows
- Linux
- BSD
- macOS
- POSIX
- Embedded
- Android
- iOS
- PS3
- PS4
- PS5
- PS Vita
- Xbox 360
- Xbox One
- Nintendo
- Switch

Supported architectures:

- x86
- x64
- ARM
- ARM64
- PPC
- MIPS32
- MIPS64

Supported compilers:

- GCC
- Clang
- LLVM
- MSVC

Compatible with:

- Lua 5.1 API+ABI
- +JIT
- +BitOp
- +FFI
- Drop-in DLL/.so

## Overview

LuaJIT has been successfully used as a **scripting middleware** in games, appliances, network and graphics apps, numerical simulations, trading platforms and many other specialty applications.

LuaJIT is part of a hundred million web sites, huge SaaS installations, network switches, set-top boxes and other embedded devices. You've probably already used LuaJIT without knowing about it.

LuaJIT scales from embedded devices, smartphones, desktops up to server farms. It combines high flexibility with high performance and an unmatched **low memory footprint**.

LuaJIT has been in continuous development since 2005. It's widely considered to be **one of the fastest dynamic language implementations**. It has outperformed other dynamic languages on many cross-language benchmarks since its first release — often by a substantial margin.

For **LuaJIT 2.0**, the whole VM has been rewritten from the ground up and relentlessly optimized for performance. It combines a **high-speed interpreter**, written in assembler, with a **state-of-the-art JIT compiler**.

An innovative **trace compiler** is integrated with advanced, SSA-based optimizations and highly tuned code generation backends. A substantial reduction of the overhead associated with dynamic languages allows it to break into the performance range traditionally reserved for offline, static language compilers.

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