T N T Vers. 1.6

“Tree analysis using New Technology”

Goloboff, Farris, & Nixon, 2003


last update: October 5, 2022

(note Lin32 and Mac32 are discontinued)

Windows (GUI and Command-driven)
[32 bits]

Cygwin version (including MPI)

MacOS (M1 Arch. - GUI and Command-driven)

(You can get an older Intel version here)

Linux (GUI and Command-driven, including MPI)

TNT stands for "Tree analysis using New Technology". It is a program for phylogenetic analysis under parsimony (with very fast tree-searching algorithms; Nixon, 1999, Cladistics 15:407-406; Goloboff, 1999, Cladistics 15:407-428), as well as extensive tree handling and diagnosis capabilities. It is a joint project by Pablo Goloboff, James Farris, and Kevin Nixon.

The Willi Hennig Society

As of November 2007, the project was subsidized by the Willi Hennig Society, and thus the program is now made freely available, upon agreement on the terms of the license presented by TNT when it is run for the first time in a machine (a copy of the license can be found here). The license provided is a single-user license, and the most important requirements are that the program is not posted in other websites or mirrors, and that when publishing results you acknowledge having used the Willi Hennig Society edition of TNT and cite the paper describing this version of the program (Goloboff & Catalano, 2016, Cladistics, DOI 10.1111/cla.12160)

Notes to run TNT in parallel, under Linux or Mac.- You have to install PVM in your machine, and copy the binary file to the PVM directory for binaries (either to $PVM_ROOT/bin/LINUX, or LINUX64, or DARWIN). Mixing 32 and 64 bit versions poses no problem, but binaries with limits on number of taxa do not connect properly to binaries without such limit, and viceversa. To avoid mixing, you can rename the binaries of any type (and make sure you copy identically renamed binaries to the corresponding PVM directory). You should no longer have problems compiling PVM, if you download a recent version (previous versions had problems with some compilers, but they have been fixed now --thanks, PVM guys!!).

Parallelization with MPI.- Alternatively, you can use (CygWin or Linux only) the version that runs with MPI. Many SysAdmins deprecate PVM, so you may have better luck letting them run your analysis if using MPI. Plus, MPI is the only way to parallelize runs under Windows (with CygWin). A brief explanation of how to install and configure MPI on your machine can be found here

Running TNT on Macs.- Macs are quite restrictive about permissions for programs downloaded from the web. So, when you first try to run TNT (tnt.command), the operating system will try to stop you. Navigate to System Preferences > Security and Privacy and choose "Allow" for tnt.command. Also, with newer versions of MacOS, it is becoming increasingly difficult to compile PVM; you can get a precompiled version of the daemon (all you really need to run PVM) here.

Updates.- Updates are done regularly (often every 2 months or so). The last update was done on October 5, 2022 (note Linux 32 and Mac 32 are discontinued). A list of recent additions and bugfixes is maintained here. For simplicity, we no longer distribute versions with and without taxon limit; all versions distributed can run any number of taxa.

TNT data sets from GenBank files

The program GB2TNT (Goloboff & Catalano, 2012, Cladistics 28: 503–513) provides an easy way to create data sets for TNT from GenBank data (including all the taxonomic information from the GenBank files, so that it is easy to diagnose results and color different taxonomic groups). The program and documentation (still in beta; current version is 0.75) can be downloaded here.


The main documentation is in the file tnt.htm, and recent additions or bugfixes are in the file BugFixes.htm; both of these are contained within all the packages (except the character-mode Windows version). On-line help on all TNT commands can be obtained with the help command. A general description of TNT version 1.0 for Windows is in a QuickTutorial (a PowerPoint presentation; this is probably the easiest way to get started). Some example files for scripting come in the self-extracting files zipdruns.zip or tnt_scripts.zip, and additional scripts are here (with full documentation of the scripting language in a pdf file). Instructions to view large trees in Windows and process the taxonomy contained within taxon names (as in Goloboff et al., 2009, Cladistics 25:211-230) can be found here


Keep in mind that freezes/crashes might occassionally occur, and save results frequently. The program is intended only for strictly academic use, and is provided "as is," with no express or implied warranties. None of the authors of TNT is responsible in any way for any problems the program causes to your computer, your data, your career, or your life. A copy of the license agreement can be found here

Bug Reports

Bug reports are appreciated, but please keep in mind that a bug report, to be of any use, must include the version of TNT (including date), the complete data file, and all the commands necessary to show the bug (or, at least, the exact sequence of menu operations that consistently leads to a crash, freeze, or miscalculation). Send bug reports to Pablo, with "tnt bug report" in the subject.

Trees in ASCII characters

To properly view the trees drawn by TNT with extended ASCII characters you will need to install the Tred.ttf font (available here). In Windows, you can just copy it to the Fonts directory (or install from control panel). In Linux or Mac, you will have to copy Tred.ttf to the directory where other True Type fonts (*.ttf) are located (probably something like /usr/X11R6/lib/X11/fonts/TTF/ in Mac, or /usr/share/fonts/truetype/ in Linux). The second step you need to do, for each file to view, is to convert it to unicode characters, using the converter to unicode (available for Mac Intel, Linux 32, and Linux 64):

tounicode tnt_output_file unicode_file [enter]

Then, you can open unicode_file with OpenOffice, or the like, select all text, and change font to Tred. The trees will then look ok.


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