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Latest Release: Tcl/Tk 9.1a0 (Jul 30, 2025)

Tcl/Tk 9.1a0 is the current development work on Tcl and Tk, aiming toward stable releases in September 2026. They add new features and interfaces to the foundation of Tcl/Tk 9.0.

Highlights of Tcl 9.1

  • New subst options: -backslashes, -commands, -variables.
  • New C routine Tcl_IsEmpty.
  • New C routine Tcl_GetEncodingNameForUser.
  • New C routine Tcl_AttemptCreateHashEntry.
  • New C routines Tcl_ListObjRange, Tcl_ListObjRepeat, Tcl_ListObjReverse.
  • Improved list internals for memory efficiency of large lists.
  • .... and more under development....

Highlights of Tk 9.1

  • Handling of negative screen distances.
  • Extended states in ttk::treeview and ttk::notebook
  • Improvements to Tk_CanvasTextInfo
  • Removed obsolete support for Windows XP appearances.
  • .... and more under development....