Skip to content


Switch branches/tags

Seamly Banner


GitHub release (latest by date including pre-releases)
GitHub Workflow Status Travis (.org) branch GitHub commit activity GitHub contributors
GitHub GitHub language count
Website Discourse posts

Seamly2D is pattern design software to create reusable, scalable, sharable custom-fit patterns using bespoke tailoring, haute couture, and historical pattern drafting techniques. Seamly2D saves time and improves fit by creating patterns that are reusable parametric CAD engineering documents.

Unlike other pattern design software, Seamly2D allows designers to have complete control of the patternmaking process. Each reusable, scalable pattern can read multi-size tables for boutique sizing, and read individual measurement files for custom-fit.

Seamly2D is open source software released under the GPLv3+ license. Seamly2D is available for Windows, MacOS, and Linux. Learn more about Seamly2D by joining our active, friendly community at

Supported platforms:

  • Windows 10 (64-bit)
  • Most current Linux distros with KDE desktop
  • Mac OS X 10.8 (64-bit) or later

Download Seamly2D

Download from our Releases page here:

Seamly2D Community Resources:

Build Seamly2D

Basic Software Prerequisites:

Development methods and styles:

Build method:

Install Additional Libraries and Programs:

to build Seamly code on Linux (general)

  • All Qt-tools come as qmake-qt5, etc. If you build from command line instead of within Qt Creator, run the following prior to running qmake-qt5:
    export QT_SELECT=5
  • The default prefix for command make install is /usr. For using another prefix build with qmake command:
    qmake PREFIX=/usr/local PREFIX_LIB=/usr/lib/i386-linux-gnu -r CONFIG+=noDebugSymbols CONFIG+=no_ccache

where /usr/local is a new prefix for installation binary files and /usr/lib/i386-linux-gnu is new prefix for install libraries. Add path to Qt using .bashrc


  sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test     
  sudo apt-get -qq update  
  sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 60 --slave /usr/bin/g++ g++ /usr/bin/g++-7  
  sudo apt-get install -y build-essential mesa-utils mesa-common-dev libgl1-mesa-dev  
  sudo apt-get install -y poppler-utils  
  sudo apt-get install -y xvfb  
  sudo apt-get install -y libfontconfig1-dev libfreetype6-dev  
  sudo apt-get install -y libx11-devlibxext-dev libxfixes-dev libxi-dev  
  sudo apt-get install -y libxrender-dev libxcb1-dev libx11-xcb-dev libxcb-glx0-dev
  sudo apt-get install -y libqt5xmlpatterns5-dev
  • Manually retrieve and install ccache
sudo dpkg -i ccache_3.7.7-1_amd64.deb.html


Windows 10

  • Add the Qt directory to the Windows PATH environment variable through Control Panel:
     [Control Panel|System And Security|System|Advanced Tab|Environment Variables button]

Additional Information about Qt

  • Add Seamly2d, gcc, g++, xpdf, and QtCreator directories to your operating system's PATH environment variable via Linux .bashrc or Windows' Control Panel.(example: for Windows add c:\Qt\%VERSION%\bin)
  • Use QtChooser to update and set the latest QT version as default.
  • In QtCreator create your compiler kit (eg MSVC 2019, g++, gdb) and assign the compiler kit to your project. This automatically defines your Qt variables for compilers, debuggers, etc.
  • Build Seamly2D from within QtCreator (see forum post) OR from command line using Qt's qmake-qtx from a terminal window:
qmake ..\ -r CONFIG+=noDebugSymbols CONFIG+=no_ccache
make (or nmake or jom, depending on your platform)


Seamly2D 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 3 of the License, or (at your option) any later version.

Seamly2D 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.

See LICENSE_GPL.txt file for further information

Other components released under:

  • QMuParser - BSD license
  • VPropertyExplorer - LGPLv2.1 license