Setting up MMT

To obtain and set up MMT, perform the following steps:

1. Install Java ≥ 14 (if you haven’t already)

Both OpenJDK and Oracle’s JDK are supported. Be sure that Java ≥ 14 is in fact the one on your PATH: run java --version in your shell to find out.

2. Install the MMT development IDE: IntelliJ IDEA + MMT plugin

This step is optional but highly recommended if you want to view or write MMT files yourself. If you just want to sample MMT, you should definitely do it with an IDE.

Install IntelliJ IDEA, either Community or Ultimate edition, with a version compatible with the MMT plugin you will install later. Refer to the IntelliJ IDEA MMT plugin page for installation of the plugin.

In case you are a student, note that you can freely get the Ultimate version by verification of your student status. Consult the JetBrains homepage for more details.

Alternatively, you can still use jEdit as your development IDE. See this article describing the setup of jEdit with MMT.

3. Install Git

MMT uses git internally, so make sure it is installed.

4. Install MMT

Until now you have installed the development environment interfacing with your future installation of MMT itself. However, you still need the actual MMT software.

There are two options for this step:

4.a. Casual Users: Download the Binary Distribution

Download mmt.jar from UniFormal/MMT’s release page. It provides a self-contained executable file.

mmt.jar is released roughly every 2 months.

4.b. Advanced Users: Clone the Source Distribution and Build MMT Yourself

Clone the UniFormal/MMT repository from GitHub:

git clone

Alternatively, if you do not have ssh keys set up, use

git clone`

A detailed explanation of the contents of the repository is available here. The development happens on the devel branch, hence you most likely want to git checkout devel, too.

MMT is currently built for Scala 2.12.9 (incuded in the repository) and building is done with sbt (the Scala build tool). If you do not have sbt, get the latest version at

To build, execute

cd MMT/src
sbt mmt/deploy

(Detailed instructions for building can be found here, including a possible error you may encounter and its solution).

This creates many files, in particular the file mmt.jar in the folder ../deploy/.

Change to that directory:

cd ../deploy/

Besides mmt.jar, this directory contains executable scripts (for Windows and Unix) to for running MMT.

5. Set Up MMT

If you only want to use MMT from within IntelliJ IDEA, you can skip this step.

In the previous, you obtained the file mmt.jar (by downloading or building).

To start setup, open a shell, navigate to the folder MMT/deploy and run java -jar mmt.jar.
On Windows, this assumes that git can be called from within sh, which means sh has to be in your PATH; depending on how you installed git, this may already be the case. If it is not in your PATH, you can also directly issue the java -jar mmt.jar command from within Git Bash from an existing Git for Windows installation.

This triggers the setup dialog which does the following:

  1. asks for a directory into which MMT should be installed
  2. checks out some example content repositories into that directory (This requires git and internet access.),
  3. determines the location of your jEdit settings directory and - if it exists - adds the MMT plugin to jEdit.

Further instructions for setting up jEdit are available here.

6. Run MMT

If you want to use MMT via an IDE, you do not have to run MMT itself. It will act as a plugin within jEdit or IntelliJ: just start jEdit and open .mmt files, or start a new MathHub-project within IntelliJ.

Developers or advanced users may want to run MMT directly for various other applications. The canonical way for this is to run java -jar mmt.jar. (This responds with a simple setup dialog if MMT not installed, and drops to a shell otherwise.) But depending on your OS and configuration, double-clicking or executing mmt.jar may also work.

Additional instructions for running MMT are available here.

Later: Update MMT

This step is not part of the initial setup. It is only needed later when updating your MMT installation to the latest release.

To update MMT, replace the file mmt.jar, i.e.,

  • binary distribution: download the new file and save it over deploy/mmt.jar
  • source distribution: update your working copy and rebuild.

To rerun setup, execute

java -jar mmt.jar :setup

However, rerunning the full setup is usually not necessary. To update your jEdit instance, execute

java -jar mmt.jar :jeditsetup install