Regina: Software for 3-manifold topology and normal surface theory

Latest version: 4.96 (August 2014)
Updated packages: 2 September 2015

ContentsExtracts from the users' handbook
What is Regina?
What's new in version 4.96?
Announcement mailing list
License and citation
What does Regina do?
Who is Regina?
Other pages
Census data and related articles
Building from source
Deprecation guide (for version 5.0)

Notice: The Ubuntu and Debian repositories have moved, as of 31 August 2014.

You will need to update your software sources. For details, see the install notes below for your version of Ubuntu or Debian.


2 September 2015: Packages for Fedora 22 and Mageia 5 are now available for download. See also recent packages for Debian 8.0 (Jessie), Ubuntu 15.04 (Vivid), and openSUSE 13.2.

31 October 2014: Regina comes to the iPad! Just follow the download link. Feedback is always welcome, especially for a fresh new port such as this.

31 August 2014: Version 4.96 is out! This is a big release—it adds certification of hyperbolicity (using strict angle structures and linear programming), richer SnapPea/SnapPy support, faster and richer census lookup, stronger group simplification and recognition, non-orientable prime decomposition, several new constructions and operations on triangulations, plus more simplifications and cleanups of the GUI and the API. You can read more about what's new, or go ahead and download the new version.

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What is Regina?

Regina is a suite of mathematical software for 3-manifold topologists. It focuses on the study of 3-manifold triangulations, normal surfaces, and angle structures.

Other highlights of Regina include census enumeration, combinatorial recognition of triangulations, and high-level tasks such as 3-sphere recognition and connected sum decomposition. Regina comes with a full graphical user interface, and also offers Python bindings and a low-level C++ programming interface.

See the users' handbook for a full list of features.

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All of the screenshots below were taken with Regina 4.96 running on MacOS X. Click on each thumbnail for a full-sized version.

Screenshot thumbnail Studying 3-manifold triangulations
Screenshot thumbnail Normal surfaces and angle structures
Screenshot thumbnail In-built Python scripting

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Regina is available for MacOS, Windows, GNU/Linux, and iPad.

If you encounter any problems when you run Regina, you can check the troubleshooting page to see if your problem is discussed there. You also most welcome to contact us for help.


Regina on MacOS uses a typical drag-and-drop installer. Just drag Regina into your Applications folder.

MacOS VersionInstaller
Yosemite (10.10)
Mavericks (10.9)
Mountain Lion (10.8)
Lion (10.7)


Regina on Windows uses a standard point-and-click installer.

Windows VersionInstaller
Windows 8
Windows 7
Windows Vista
Windows XP (see below)

Notes for Windows:


You can download ready-made packages for several GNU/Linux distributions. All of these packages are named regina-normal (to avoid conflicting with the other Regina). Please click on the Download link for your system in the table below.

To keep the installation simple, most packages do not include the MPI (high-performance computing) utilities. If you need these, let Ben know and he can build you an MPI-enabled package.

Distribution Version 32-bit package (i386 or i586) 64-bit package (amd64 or x86_64)
Debian 8.x (jessie) Install Install
7.x (wheezy) Install Install
unstable (sid) Install Install
Fedora 22 Download Download
21 Download Download
20 Download Download
19 Download Download
Mageia 5 Download Download
4 Download Download
3 Download Download
openSUSE 13.2 Download Download
13.1 Download Download
12.3 Download Download
Ubuntu 15.04 (vivid) Install Install
14.10 (utopic) Install Install
14.04 LTS (trusty) Install Install
12.04 LTS (precise) Install Install

For older versions of GNU/Linux:

For newer versions of GNU/Linux:

For other GNU/Linux distributions:


The iPad app is very new, and offers most but not all of Regina's functionality. In particular, it does not include Python support, and does not work with some of the more exotic import/export formats. If you need these features then please download one of the desktop versions listed above.

iOS VersionInstaller
iOS 7 and above Download on the App Store

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Regina comes with rich documentation for both users and developers.

Users' Handbook

The Regina Handbook is full of screenshots, and walks you through the different things that Regina can do. The handbook was completely refurbished for Regina 4.90, so you might want to take a fresh look.

You can read the handbook from within Regina by selecting Help → Regina Handbook from the menu. You can also read it here online.

Python/C++ API Documentation

If you are doing Python scripting or C++ programming with Regina, there is extensive API documentation for Regina's mathematical engine. This describes the various objects, classes and functions that Regina makes available to you.

You can read the API documentation by selecting Help → Python API Reference from the menu. You can also read it here online.

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What's new in version 4.96 (August 2014)?

Some of the main highlights in version 4.96:


Other optimisations

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Announcement Mailing List

You are welcome to subscribe to the announcement list This is a moderated list with extremely low traffic, and is only used for major announcements such as new releases of Regina. You can subscribe or unsubscribe here.

There are other mailing lists for user support and development; click here for details.

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License and Citation

The primary developers of Regina are Benjamin Burton, Ryan Budney, and William Pettersson.

Many others have been of assistance with this project, be it through time, knowledge, testing or code. Please see the full list of acknowledgements in the users' handbook.


If you find Regina useful in your research, please consider citing it as you would any other paper that you use. A suggested form of reference is:
Benjamin A. Burton, Ryan Budney, William Pettersson, et al.,
Regina: Software for 3-manifold topology and normal surface theory,, 1999–2014.
Or, in BibTeX:
    author = {Benjamin A. Burton and Ryan Budney and William Pettersson and others},
    title = {Regina: Software for 3-manifold topology and normal surface theory},
    howpublished = {{\tt http://\allowbreak regina.\allowbreak sourceforge.\allowbreak net/}},
    year = {1999--2014}}

Copying & modification

Regina is copyright © 1999–2014, The Regina development team.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

Some of this code comes with additional permissions, which allow it to be distributed through online repositories such as Apple's App Store or Google Play. See the full license in the users' handbook for details.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.

Detailed License

Regina includes portions of external software for specialised tasks (such as code from SnapPea and SnapPy for some geometric calculations, and code from Normaliz for computing Hilbert bases).

For complete license details, including the full GNU General Public License and information on external software that Regina uses, see the full license in the users' handbook.

Project Hosting

SourceForge We are grateful to for hosting this project on their servers.

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If you have any suggestions, problems, bugs, wishes, frustrations or otherwise miscellaneous comments, we would really love to hear them. This program is permanently under development and we would like to know what people want out of it.

If you have written your own extensions that you think could be worth putting in the main release, please do write and let us know.

Even if you have no comments to make, it's always nice to hear from people using Regina, even if it's just to say hi. We're always interested to hear how this software is being used.

You can contact us by email: the best address is, which will reach all of the developers. Of course you are also welcome to send us personal emails: our websites are linked to our names in the author list above.

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