Cygwin
What it is
Cygwin brings GNU and other open-source software to Windows through a library that provides POSIX system calls and an accompanying environment. The distribution contains thousands of packages, including GNU and BSD tools, an X server, and X applications. Developers can use its tools, headers, and libraries to build Windows console or GUI programs with parts of the POSIX API or to port Unix software. Cygwin programs work from shells such as bash, tcsh, and zsh. Installation is handled through the Cygwin Setup GUI, where packages are selected and updated individually. Only a minimal base set, about 100 MB, is installed by default. Setup also accepts command-line options for automated installs and supports local repositories for offline installation. The current DLL supports recent 64-bit Windows versions beginning with Windows 8.1, with documented x64 emulation on Windows 11 ARM PCs. Cygwin is free to download and use.
For and against
For
- Thousands of GNU and BSD packages
- Includes bash, tcsh, and zsh support
- Automated and offline installation options
- Free to download and use
- Signed metadata and hash checks
Against
- Windows only
- Does not run native Linux applications directly
- Programs must be rebuilt from source
- Minimal package set installs by default
The verdict
Cygwin provides a broad Unix-like toolkit and POSIX environment on Windows at no cost. Users should expect package-by-package installation and rebuilding requirements for Linux software.
Who it suits
Cygwin suits Windows users who need Unix-style tools, shells, or POSIX-oriented development utilities. It can also help port Unix programs, provided they are rebuilt from source.
Plans and prices
Cygwin
Windows only · installable packages selected individually · does not run native Linux apps without rebuilding from source
Read 9 Oct 2026 · cygwin.com
On the record
- Automation and offline use
- Setup accepts command-line arguments for automated installs, and the site documents installing from a local package repository without internet access.cygwin.com · read 9 Oct 2026
- For developers
- Cygwin includes tools, headers, and libraries for writing Windows console or GUI applications using parts of the POSIX API and for porting Unix programs.cygwin.com · read 9 Oct 2026
- Included software
- The distribution includes thousands of packages, including GNU and BSD tools, an X server, and X applications.cygwin.com · read 9 Oct 2026
- Installation
- The recommended installation method is the Cygwin Setup GUI, which lets users choose packages and update them individually.cygwin.com · read 9 Oct 2026
- Licensing
- Cygwin tools use various licenses, including GPL, public domain, and X11-style licenses; the Cygwin API library is under LGPL version 3 or later.cygwin.com · read 9 Oct 2026
- Not supported
- Cygwin does not run native Linux applications on Windows; applications must be rebuilt from source to run with Cygwin.cygwin.com · read 9 Oct 2026
- Package selection
- Only minimal base packages are installed by default, taking about 100 MB, and users can select additional packages in Setup.cygwin.com · read 9 Oct 2026
- Package updates
- Individual packages are released separately from the Cygwin DLL, so the DLL version is not a general distribution release number.cygwin.com · read 9 Oct 2026
- Security
- Setup verifies signed package metadata and checks downloaded packages against their listed cryptographic hashes; the FAQ says Cygwin uses SHA-512 for setup metadata.cygwin.com · read 9 Oct 2026
- Shells
- Cygwin programs can be used from shells including bash, tcsh, and zsh.cygwin.com · read 9 Oct 2026
- Support
- The project directs users to its FAQ, User's Guide, mailing list archives, and mailing lists for questions and bug reports.cygwin.com · read 9 Oct 2026
- Supported platform
- The current Cygwin DLL supports recent 64-bit Windows versions starting with Windows 8.1; the FAQ also describes x64 emulation on ARM PCs running Windows 11.cygwin.com · read 9 Oct 2026
- What it does
- Cygwin provides GNU and other open source tools on Windows, with a library that supplies POSIX system calls and environment.cygwin.com · read 9 Oct 2026
