mech

Mech is for building data-driven, reactive systems like robots, games, embedded devices and more.

It simplifies data distribution, transformation, and analysis so you can focus on your project.

• Try Mech online in your browser.
• Read the docs to learn the language.
• Follow our blog to stay updated on new developments.

The following code implements FizzBuzz in Mech:

See the docs for an extended version that runs live in your browser.

Some notable features of Mech are demonstrated in this short program:

• Concise Syntax: Expressive and flexible, with no need for keywords or semicolons; Mech programs are generally shorter than in other languages.
• Broadcast Operations: Vector operations apply elementwise automatically, removing explicit loops and enabling efficient vectorization.
• Logical Indexing: Vector elements are conditionally selected using broadcast logic operations, enabling declarative iteration and parallel execution.
• Type Inference: Variable and expression types are inferred, so explicit type declarations are often unnecessary.
• Immutable: Variables are immutable unless specified, promoting safer code and easier reasoning.
• Rich Text: Mech programs support rich formatting and literate programming through Mechdown, a Markdown dialect.

Download and Install

From Binary

Download the precompiled latest release for your platform.

From Source

To build Mech from source, you'll first need to install Rust (make sure to install a recent version on the nightly release channel, currently we are developing against nightly-2025-11-12).

Then follow the instructions below to compile the Mech toolchain, bundled in a single executable called mech:

git clone https://gitlab.com/mech-lang/mech
cd mech
cargo build --bin mech --release

Alternatively, you can install Mech directly via Rust's Cargo utility:

cargo install mech

Documentation

New to Mech? Start with Learn Mech in Fifteen Minutes.

Comprehensive documentation is available at docs.mech-lang.org and open-sourced on GitHub.

Community

The Mech community stays active at a few places around the Internet:

• Discord - for live chat
• GitHub - for code and issues
• YouTube - for video tutorials
• Reddit - for help and general discussion
• Mailing List - for dev discussion

Feel free to stop by and introduce yourself -- we're happy to meet new users and answer questions!

Project Roadmap

Mech v0.2 is currently beta status, meaning most intended features are implemented, but rough edges abound and there is a general lack of documentation. Development is focused on testing and documentation.

A Brief Roadmap:

• ☑️ v0.1 - proof of concept system - minimum viable language implementation
• 📍 v0.2 - data specification - formulas, defining and manipulating data
• ☐ v0.3 - program specification - functions, modules, state machines
• ☐ v0.4 - system specification - tools, distributed programs, capabilities

For more details, read the ROADMAP.

A new version of Mech is released every week.

Notice

Mech should be considered unstable and therefore unfit for use in critical systems until v1.0 is released.

License

Licensed under Apache 2.0.