This project is dedicated to developing more readable format(s) for Lisp-based languages (such as Common Lisp and Scheme) and implementing those formats (readers, pretty-printers, editor macros, etc.). MIT license preferred, to spread them widely.


  • Infix notation, e.g., {3 + 4} in addition to (+ 3 4)
  • Optional traditional function notation, e.g., f(...) in addition to (f ...)
  • Optional indentation support greatly reduces the need for parentheses
  • Works on any data or program (it is general and homoiconic)

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MIT License

Follow Readable Lisp S-expressions

Readable Lisp S-expressions Web Site

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User Reviews

  • Excellent! Programmers that come to Lisp and Scheme will have an easier time to adapt to these wonderful languages.

  • And I have almost gave up on Lisp/Scheme.... I can't believe that this project existed from 2006 and almost no one knows about it... What a shame!

  • It's hard to overstate the importance of this project. Finally, a readable (and writable!) syntax for Lisp and Scheme! This has made me think about trying these languages seriously for general use (rather than just Emacs Lisp!) for the first time.

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Additional Project Details

Intended Audience

Science/Research, Advanced End Users, Developers

User Interface

Console/Terminal, Command-line

Programming Language

Lisp, Common Lisp, Scheme