Simple ANSI terminal support, with Windows compatibility

Version on this page:
LTS Haskell 22.29:1.0.2
Stackage Nightly 2024-07-13:1.1.1
Latest on Hackage:1.1.1

See all snapshots ansi-terminal appears in

BSD-3-Clause licensed by Max Bolingbroke
Maintained by Roman Cheplyaka
This version can be pinned in stack with:ansi-terminal-,3372

Module documentation for


Haskell ANSI Terminal Package For Windows, OS X and Linux


ANSI terminal support for Haskell, which allows:

  • Cursor movement
  • Screen and line clearing
  • Color output
  • Showing or hiding the cursor
  • Changing the console title (though this is not strictly part of ANSI, it is widely supported in Unix)

It is compatible with Windows (via an emulation layer) and those Unixes with ANSI terminals.

If you like this, you may be interested in ansi-wl-pprint, which provides a pretty-printer that can construct strings containing ANSI colorisation.

Not all of the ANSI escape codes are provided by this module, but most (if not all) of the popular and well supported ones are. For a full list, have a look at the current version of the API. Each supported escape code or family of codes has a corresponding function that comes in three variants:

  • A straight IO variant that doesn’t take a Handle and just applies the ANSI escape code to the terminal attached to stdout
  • An IO variant similar to above, but which takes a Handle to which the ANSI escape should be applied
  • A String variant that returns a literal string that should be included to get the effect of the code. This is the only one of the three API variants that only works on Unix-like operating systems: on Windows these strings will always be blank!


A full example is available, but for a taste of how the library works try the following code:

import System.Console.ANSI

main = do
    setCursorPosition 5 0
    setTitle "ANSI Terminal Short Example"

    setSGR [ SetConsoleIntensity BoldIntensity
           , SetColor Foreground Vivid Red
    putStr "Hello"

    setSGR [ SetConsoleIntensity NormalIntensity
           , SetColor Foreground Vivid White
           , SetColor Background Dull Blue
    putStrLn "World!"


Haddock documentation is available at Hackage.


The library is originally written by Max Bolingbroke


Roman Cheplyaka is the primary maintainer.

Oliver Charles is the backup maintainer. Please get in touch with him if the primary maintainer cannot be reached.




Add an example to the haddocks


Fix a GHC 7.10 warning


Restore compatibility with GHC 7.4 and older

Version 0.6.2

  • Add hSupportsANSI
  • Drop support for base < 4


Fix to build with GHC 7.8 on Windows

Version 0.6.1

  • BoldIntensity no longer changes background color on Windows
  • setSGR [] was not equivalent to setSGR [Reset] on Windows, even though it should be according to the documentation. This is now fixed.