Clean (programming language)
| Clean | |
|---|---|
 | |
| Paradigm | Functional |
| Designed by | Software Technology Research Group of Radboud University Nijmegen |
| First appeared | 1987 |
| Stable release | 5.0
/ 2 July 2026 |
| Typing discipline | Strong, static, dynamic |
| OS | Cross-platform |
| License | Simplified BSD |
| Filename extensions | .icl, .dcl, .abc |
| Website | clean-lang |
| Influenced by | |
| Lean, Miranda, Haskell | |
| Influenced | |
| Haskell, Idris | |
Clean is a general-purpose purely functional programming language. Originally called the Concurrent Clean System or the Clean System, it has been developed by a group of researchers from the Radboud University in Nijmegen since 1987. Although development of the language has slowed, some researchers are still working in the language. In 2018, a spin-off company was founded that uses Clean.