Setting up MMT


The following outside tools are typically used with MMT:

  • To run MMT, you must install Java.
  • To interact with existing MMT content, you should install git. (MMT itself does not need git, but all formalizations made with MMT are stored in git repositories.)
  • To have an IDE for writing MMT content, you should install jEdit.
  • To build MMT from sources, you need sbt, which you can install by itself or obtain as a part of a Scala IDE (see next item).
  • If you also plan to develop MMT, you should install a Scala IDE such as IntelliJ with the Scala plugin. Note that MMT uses the latest Scala 2.x, not Scala 3.

Step 1: Get the MMT jar file

Option 1a: Download a binary release

Download the latest mmt.jar from UniFormal/MMT’s release page

Option 1b: Build from sources

Use git clone

If recommended/instructed switch to the devel branch to get the latest updates or create your own branch off devel.

Build MMT via cd MMT/src; sbt mmt/deploy or by triggering an MMT build from within the Scala IDE of your choice.

Step 2: Setup MMT

Excecute the MMT jar file via java -jar mmt.jar.

This triggers the setup dialog which does the following:

  1. asks for a directory into which MMT content should be installed,
  2. checks out some example content repositories into that directory (requires git and internet access),
  3. runs MMT to build those repositories,
  4. if you have installed jEdit before, configure it for use as an MMT IDE. (Further instructions for setting up jEdit are available here.)


  • OpenJDK and Oracle’s JDK are supported.
  • You can rerun this setup dialog (e.g., after updating MMT) by running java -jar mmt.jar :setup To install/update only the jEdit integration, use java -jar mmt.jar :jeditsetup install.
  • In case you are a student, you can get IntelliJ Ultimate for free. Consult the JetBrains homepage for more details.
  • Here is a detailed explanation of the MMT repository’s contents.