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Download SWI-Prolog development versions

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Windows version (64-bits)11,686,404 bytesSWI-Prolog 7.7.22-1 for Microsoft Windows (64 bit)

Self-installing executable for Microsoft's 7/8/10 64-bit editions. See the reference manual for deciding on whether to use the 32- or 64-bits version.

Windows version (32-bits)11,395,755 bytesSWI-Prolog 7.7.22-1 for Microsoft Windows (32 bit)

Self-installing executable for MS-Windows. Installs swipl-win.exe and swipl.exe. Works on Windows 7/8/10.

Snow Leopard and later23,150,975 bytesSWI-Prolog 7.7.22-1 for MacOSX 10.6 (Snow Leopard) and later on intel

Mac OS X disk image with relocatable application bundle. Needs xquartz (X11) installed for running the development tools. The bundle also provides the commandline tools in the Contents/MacOS directory.

Source archive10,408,402 bytesSWI-Prolog source for 7.7.22

Sources in .tar.gz format, including packages and generated documentation files. See build instructions.

PDF file2,468,815 bytesSWI-Prolog 7.7.22 reference manual in PDF

SWI-Prolog reference manual as PDF file. This does not include the package documentation.

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About the development releases

The development branches have their own GIT repository at the address below. See the general GIT instructions for details.

% git clone https://github.com/SWI-Prolog/swipl-devel.git

SWI-Prolog Version 7

SWI-Prolog version 7 is a major release that introduces significant new concepts to the language. A full description is in the section SWI-Prolog extensions. Below is a short summary.

  • Lists are no longer represented as .(H,T). Instead, the list functor is now '[|]'(H, T). The empty list is still [], but this is not an atom. I.e., '[]' == [] fails.
  • By default, double quoted "text" is mapped to an object of type string. This already raised some discussions.
  • The system introduces `dicts' as primary citizens. Dicts are collections of key-value pairs, optionally tagged. Dicts are supported by read and write. The syntax is
    tag{key1:value1, key2:value2, ...}

    Keys in a dict can be addressed using the functional notation Dict.Key. User functions on dicts can be accessed as Dict.Compound (e.g., Vector.multiply(V2)).

  • Putting quotes around operator names that do not need quoting stops the atom to act as an operator:
    ?- A = 'dynamic'/1.
    A = (dynamic)/1.
    ?- op(100, xf, 'Kwh').
    ?- A = 100'Kwh'.
    A = 100 'Kwh'.
  • functor() is valid syntax. It produces a term that is distinct from 'functor'. The `block' operator '()' to hack this syntax has been deleted.
  • The `block' operators [] and {} remain.
See also
- SWI-Prolog future directions
- Daily builds for Windows
- Ubuntu PPA binary packages
- Build instructions