v 1.20  2023-02-14

• Comparison to other font now focuses on the stronger changes, tests more pairs, and maps glyphs correctly between the fonts.
• Kerning pairs that impact composite glyphs (such as fractions) are now autokerned. Kern On will show a notification if this has created new autopairs in your font. Keep in mind that setting a glyph (-side) to “No kerning” is often the most elegant way of removing unwanted autopairs.
• Improved application of complex OT features. While this got more reliable, some advanced techniques are not fully supported yet. For example, “ignore sub” statements are not applied yet, so you may get some irrelevant pairs. As always, you can use independent zero-value pairs to switch them off, or user-set autopairs to explicitly add pairs.
• Kern On remembers the previous kerning weight limit for the font.
• The current Kern On version is stored so that it can give a warning if the file was last edited with a newer version.
• Improved compatibility with Glyphs 2.
• Some smaller fixes and improvements.

v 1.19  2023-01-27

• Improved compatibility with Glyphs 3.2.
• Fixed an issue with certain types of substitutions in OT features (thanks Aaron!).
• Fix: the editing controls should no longer get completely disabled (unless a “red dot” message is shown).

v 1.18  2022-11-20

• Re-worked a part of the autokerning mechanism, to improve accuracy and speed. This should usually lead to only very small changes in the autokerning result.
• As a result of this, Kern On works properly with touching script fonts.
• The class kerning mechanism should now give results that are closer to what most human designers would do.
• Add kerning pairs for Ǽ Ǣ ǽ ǣ.
• Some more work on the on-boarding via re-working existing kerning.
• Some smaller fixes and improvements.

v 1.17  2022-10-28

• Improved the on-boarding via re-working existing kerning.
• Fix: Don’t show warnings that have been dismissed already.
• Some smaller fixes and improvements.

v 1.16  2022-08-07

• Added support for lookup type 5 when applying OT features.
• Fixed a crash due to extremely high memory usage.
• If special spacing is set for letters (which is probably accidental), you now get a warning.
• Some smaller fixes and improvements.

v 1.15  2022-07-04

• New experimental feature: Autospacing via “zero partners”. In the sidebearing fields of the Kern On window, you can enter one or several glyph names (slash separated) that should not have kerning (i.e. zero value) against this glyph side. Kern On will adjust the sidebearing so that the kerning with the given partner(s) becomes zero. Of course, this may not be possible for all partners. You can specify a partner glyph several times so as to increase its priority. For example, specifying /H/H/d for the LSB of the two will lead to zero kerning for H2 and, if possible, also zero kerning for d2. Autospacing via “zero partners” usually works well for sans-serifs, where you would typically specify /H/d for the autospaced LSB and /H/h for the RSB.            
  Note: • You can autospace several glyphs at the same time (i.e. with several glyphs selected). • You cannot autospace glyph sides that appear in models. • You can specify characters instead of glyph names but they also need to be separated by slash, e.g. /H/d/| (the last one is a bar). • You can combine this autospacing with the “autokern from” feature. In other words, in a typical sans-serif, you can almost completely autospace the italics based on the upright (after carefully setting the standard flat sides manually). • Right now, this autospacing is a one-off action, the sidebearings don’t “remember” their setting, and they don’t auto-update. I am planning to implement that, though. • Note that this feature is still somewhat experimental. Any feedback appreciated! See more on the Kern On forum.
• Added some pairs with superiors and inferiors to the default list of pairs.
• Added pairs for Ethiopic.
• Support for unlimited kerning size: with 0 kB given, Kern On will generate un-compressed, raw glyph-glyph kerning.
• Small refinements to the autokerning algorithm.
• Quadratic bezier curves are now correctly handled.
• Fix: On start-up, kerning classes used in RTL kerning are no longer removed (Glyphs 3 only).

Note:
This update is likely to autokern the font somewhat differently. I recommend to:

• Fully kern the font(s) you are working on (using the “Kern On” button)
• Create a backup copy of the working file
• Install the latest version of Kern On
• Open the working file, start Kern On
• In case Kern On removes models (this can happen), resolve the problems
• Open the backup file
• In Glyphs, activate the new version (which has KO running)
• Choose “Compare to...” the old version
• Examine the changes

v 1.14  2022-04-25

• Fixed the comparison function.
• UI fix: don’t allow interpolating and autokerning a master at the same time (thanks Hugo!).

v 1.13  2022-04-21

• Fixed some UI glitches: wrongly shown or disabled buttons (thanks Valerio!).
• Improved (background) checking for updates.
• Fixed inaccurate interpolated masters in complex set-ups (thanks Hugo!).
• Fixed setting and removing of independent pairs if autokerned from another font/master (thanks Sebastian!).

v 1.12  2022-04-05

• New feature: You can now autokern one font (or master) from another font (or master). Just open the other font, then from the (···) menu choose “Autokerned from” and select the “model master”.
• While a model is selected, holding down control to preview the “what if autokerned” is now applying the autokerned value in Glyphs, not only showing the figure.
• Several other small but important fixes and improvements under the hood.

v 1.11  2022-03-04

• Several important improvements under the hood.
• Additional inconsistency warnings.
• Fixed text cursor position when ligatures are activated (thanks Claus!).
• The KO window is now placed next to the Glyphs window (if possible).
• Better preserve high-priority pairs (if a model has to be removed).
• For model suggestions, prefer pairs that are models in other masters.
• Added Cherokee support (thanks John!).
• Fixed wrong Latin-Cyrillic pairs from Chuvash Wikipedia.
• Increased the accuracy of finalized (class) kerning values involving the fraction character (thanks Erkin!).
• Other small refinements to the Unicode pairs list.
• Fixed adding and removing user-set auto pairs.

v 1.10  2022-02-07

• Improved model suggestions and warnings.
• Somewhat improved displayed possible span (for the slider).
• Fixed a crash while re-working the exising kerning (thanks Yevgeniy!).
• Several other small but important improvements under the hood.

v 1.09  2022-01-13

• New feature: For models or independent pairs, hold ctrl to preview the kerning value it would have if it was a model. This saves you switching to Auto and back.
• Improved internal calculation of the special spacing amounts.
• Added support for some African languages (Kanuri, Bambara, Hausa, Tamajaq and Zarma) and U+2010 HYPHEN (thanks Christoph!).
• Fixed a crash (thanks Hugo!).
• Better support for Romanian with legacy Tcedilla/tcedilla.
• Unused kerning groups are now omitted.
• Several other small but important improvements and fixes under the hood.

v 1.08  2021-12-09

• New feature: Add models and independents from other master or font (to be found in the gear menu).
• Some small but important fixes.
• More appropriate model suggestions and warnings.

v 1.07  2021-11-24

• More appropriate model suggestions and quicker response.
• More appropriate warnings.
• Improved de-emphasizing of shapes below the baseline and above the x-height.
• No longer generates pairs between UC and .case. Thanks Christoph!
• pair_frequencies.txt is now sorted by script.
• Boosted “rare” scripts, i.e. all scripts are now normalized to the same maximum frequency (well, sort of). Thanks Sebastian!
• Some smaller UI improvements.
• Fixed a handful of smaller issues.

v 1.06  2021-11-02

• Fixed a problem with the signing certificate.
• Fixed a handful of smaller issues.

v 1.05  2021-10-31

As of today, we do not have a trial version any more (which was unlimited in terms of functionality, but came with an expiry date). Instead, you can download a demo version – its only limitation is that it will not finalize fonts, i.e. does not fully kern the font and generate class kerning after you push the “Kern On” button.

This version also features minor tweaks to the engine, refined warnings and suggestions, and fixes a crash when all metrics are removed.

v 1.04  2021-10-26

This version does not add any obvious new features but has significantly improved overall behaviour:

• More consistent, reliable and better autokerning results.
• Better model sugestions.
• Additional warnings. As always, do take them seriously but feel free to ignore if you are sure about it.
• Some small tweaks to the UI.

v 1.03  2021-09-30

• Fixed a couple of crashes on start-up (thanks Christoph and Christian!).
• Better support for soft hyphen (thanks Eben!).
• Added letter-to-hyphen pairs based on hyphenation dictionaries.
• Improved handling of conflicting special-spaced pairs and “Try again”-type priorities.
• Smaller refinements to the shape analysis deep inside the engine.
• Many other smaller improvements and fixes.

v 1.02  2021-09-16

• Tabular figures are set to “No kerning” the first time you use Kern On with a font. If you add them later, just set the “No kerning” manually, although this is usually not even necessary as tnum-based pairs are not autokerned.
• “Compare to...” now only compares the current master.
• Comparing fonts now also reflects spacing changes.
• Now you can click on the influencer label (under the slider) to insert it at the end of the line.
• If a glyph is modified then Kern On also updates glyhps that contain it as a component. (I hope this is reliable. If in doubt, just close and re-start Kern On to be sure everything is up-to-date.)
• The automatic selection of models when re-using pre-existing kerning is somewhat improved.
• Many other significant improvements and fixes.

v 1.01  2021-07-19

• Added feature: undo (to be found in the gear menu).
• Added feature: show glyphs and models for current special spacing group (to be found in the special spacing menu).
• “Show overview” now also shows standard-kerned glyphs, and has moved to the kerning type menu above.
• The prioritization expressed by “trying again” is slightly improved.
• If a model has to be removed, and special-spaced pairs are involved, Kern On now picks a more sensible pair to remove, better respecting the prioritization.
• If special-spaced models influence autopairs, the min/max range is more correct (usually tighter) now. This means switching an autopair to model without changing its value should no longer lead to model removals. Note that this new behaviour may also affect autokerning in general.
• Several smaller fixes and improvements.

v 1.0  2021-06-18

• Initial public release.