Tcl/Tk 9.1.0 is a development release moving toward stable 9.1 in September 2026, delivering a substantial set of language, C API, and platform updates. Tcl gains a UNICODE command and new C routines for Unicode normalization, a monotonic TIMER command with microsecond resolution, LFILTER for list selection, INTERP SET for child-interpreter variable access, and finer SUBST and SWITCH options. Many C99 math functions appear as expr functions, and several new C APIs (TCL_ISEMPTY, TCL_GETENCODINGNAMEFORUSER, TCL_ATTEMPTCREATEHASHENTRY, list-object range/repeat/reverse) and a new time API using long long are introduced. Initialization behavior now requires applications to call TCL_FINDEXECUTABLE or TCLZIPFS_APPHOOK. Platform and runtime changes include case-insensitive macOS paths, Windows AUTO_EXECOK/EXEC search reforms, revised script-library and encoding searches, improved list internals for large lists, and broader 64-bit size support.
Tk 9.1 focuses on accessibility, internationalization, and widget enhancements. It adds screen-reader support and initial bidirectional/RTL text handling, a new TTK::TOGGLESWITCH widget, and a TK ATTRIBTABLE command. Visual and interaction improvements include revised SEND on Aqua, support for negative screen distances, extended widget states in TTK::TREEVIEW and TTK::NOTEBOOK, better TK_CANVASTEXTINFO, rotated label text, dialog width limited to physical screens, improved listbox selection colors, and removal of obsolete Windows XP appearance code. Source releases are available for download.
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