Sometimes it is helpful to know what the differences between releases of Tcl/Tk are.
Perhaps you want to know how many releases back a feature is available.
Perhaps you want to know "What's new?" since your reference book was published.
These pages aim to quickly summarize the differences introduced
in each release of Tcl/Tk which are visible at the script level.
For further details, see the ''changes'' file in the Tcl/Tk distribution [http://core.tcl.tk/tcl/finfo?name=changes&n=10][http://core.tcl.tk/tk/finfo?name=changes&n=10].
  
**Tcl/Tk 8.6**  
   * [Changes in Tcl/Tk 9.0] — '''2024'''-01-05

**Tcl/Tk 8.6**  
   * [Changes in Tcl/Tk 8.6.13] — '''2022'''-11-22
   * [Changes in Tcl/Tk 8.6.12] — '''2021'''-11-05
   * [Changes in Tcl/Tk 8.6.11] — '''2020'''-12-31
   * [Changes in Tcl/Tk 8.6.10] — '''2019'''-11-21
   * [Changes in Tcl/Tk 8.6.9] — '''2018'''-11-16
   * [Changes in Tcl/Tk 8.6.8] — 2017-12-22
   * [Changes in Tcl/Tk 8.6.7] — '''2017'''-08-09
   * [Changes in Tcl/Tk 8.6.6] — 2016-07-27
   * [Changes in Tcl/Tk 8.6.5] — '''2016'''-02-29
   * [Changes in Tcl/Tk 8.6.4] — '''2015'''-03-12
   * [Changes in Tcl/Tk 8.6.3] — 2014-11-12
   * [Changes in Tcl/Tk 8.6.2] — '''2014'''-08-27
   * [Changes in Tcl/Tk 8.6.1] — 2013-09-20
   * [Changes in Tcl/Tk 8.6%|%Changes in Tcl/Tk 8.6.0] — 2012-12-20
**Tcl/Tk 8.5**
   * [Changes in Tcl/Tk 8.5.19] — '''2016'''-02-12
   * [Changes in Tcl/Tk 8.5.18] — '''2015'''-03-06
   * [Changes in Tcl/Tk 8.5.17] — 2014-10-25
   * [Changes in Tcl/Tk 8.5.16] — '''2014'''-08-25
   * [Changes in Tcl/Tk 8.5.15] — 2013-09-18
   * [Changes in Tcl/Tk 8.5.14] — '''2013'''-04-03
   * [Changes in Tcl/Tk 8.5.13] — 2012-11-12
   * [Changes in Tcl/Tk 8.5.12] — '''2012'''-07-27
   * [Changes in Tcl/Tk 8.5.11] — 2011-11-04
   * [Changes in Tcl/Tk 8.5.10] — '''2011'''-06-24
   * [Changes in Tcl/Tk 8.5.9] — '''2010'''-09-08
   * [Changes in Tcl/Tk 8.5.8] — 2009-11-16
   * [Changes in Tcl/Tk 8.5.7] — '''2009'''-04-15
   * [Changes in Tcl/Tk 8.5.6] — 2008-12-23
   * [Changes in Tcl/Tk 8.5.5] — 2008-10-15
   * [Changes in Tcl/Tk 8.5.4] — 2008-08-15
   * [Changes in Tcl/Tk 8.5.3] — 2008-06-30
   * [Changes in Tcl/Tk 8.5.2] — 2008-03-28
   * [Changes in Tcl/Tk 8.5.1] — '''2008'''-02-05
   * [Changes in Tcl/Tk 8.5] — 2007-12-20

**Tcl/Tk 8.4**

   * [Changes in Tcl/Tk 8.4.20] — '''2013'''-06-01
   * [Changes in Tcl/Tk 8.4.19] — 2008-04-18
   * [Changes in Tcl/Tk 8.4.18] — 2008-02-08
   * [Changes in Tcl/Tk 8.4.17] — '''2008'''-01-04
   * [Changes in Tcl/Tk 8.4.16] — 2007-09-21
   * [Changes in Tcl/Tk 8.4.15] — '''2007'''-05-25
   * [Changes in Tcl/Tk 8.4.14] — 2006-10-19
   * [Changes in Tcl/Tk 8.4.13] — '''2006'''-04-19
   * [Changes in Tcl/Tk 8.4.12] — 2005-12-03
   * [Changes in Tcl/Tk 8.4.11] — 2005-06-28
   * [Changes in Tcl/Tk 8.4.10] — '''2005'''-06-04
   * [Changes in Tcl/Tk 8.4.9]  — 2004-12-07
   * [Changes in Tcl/Tk 8.4.8]  — 2004-11-22
   * [Changes in Tcl/Tk 8.4.7]  — 2004-07-25
   * [Changes in Tcl/Tk 8.4.6]  — '''2004'''-03-01
   * [Changes in Tcl/Tk 8.4.5]  — 2003-11-24
   * [Changes in Tcl/Tk 8.4.4]  — 2003-07-22
   * [Changes in Tcl/Tk 8.4.3]  — 2003-05-19
   * [Changes in Tcl/Tk 8.4.2]  — '''2003'''-03-03
   * [Changes in Tcl/Tk 8.4.1]  — 2002-10-22
   * [Changes in Tcl/Tk 8.4]    — 2002-09-10

**Tcl/Tk 8.3**

   * [Changes in Tcl/Tk 8.3.5]  — '''2002'''-10-18
   * [Changes in Tcl/Tk 8.3.4]  — 2001-10-19
   * [Changes in Tcl/Tk 8.3.3]  — '''2001'''-04-06
   * [Changes in Tcl/Tk 8.3.2]  — 2000-08-09
   * [Changes in Tcl/Tk 8.3.1]  — 2000-04-26
   * [Changes in Tcl/Tk 8.3]    — '''2000'''-02-10

**Tcl/Tk 8.2**

   * [Changes in Tcl/Tk 8.2.3]  — 1999-12-16
   * [Changes in Tcl/Tk 8.2.2]  — 1999-11-04
   * [Changes in Tcl/Tk 8.2.1]  — 1999-10-04
   * [Changes in Tcl/Tk 8.2.0]  — 1999-08-17

**Tcl/Tk 8.1**

   * [Changes in Tcl/Tk 8.1.1]  — 1999-05-25
   * [Changes in Tcl/Tk 8.1]    — 1999-04-29

**Tcl/Tk 8.0**

   * [Changes in Tcl/Tk 8.0.5] — '''1999'''-03-09
   * [Changes in Tcl/Tk 8.0.4] — 1998-11-19
   * [Changes in Tcl/Tk 8.0.3] — '''1998'''-08-10
   * [Changes in Tcl/Tk 8.0p2] — 1997-11-25        ???
   * [Changes in Tcl/Tk 8.0p1] — 1997-11-07
   * [Changes in Tcl/Tk 8.0]   — '''1997'''-08-18

**Tcl/Tk 7**

   * [Changes in Tcl/Tk 7.6/4.2] — 1996-10-16
   * [Changes in Tcl/Tk 7.5/4.1] — '''1996'''-04-21
   * …
   * [Tcl 2.1] — '''1990'''-03-03

----
[Donald Porter]

-----
Commentary on individual changes also appears in
"[Advantages and disadvantages of different Tcl versions]".

See also: [Tcl Benchmarks]

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