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Kern On is a kerning assistant, devised and coded by @timahrens. Download from https://kern-on.com

Only a few places left for this workshop, don’t miss out! #fontstandcon2025

@timahrens will give a hands-on introduction to the Kern On plugin for Glyphs, with advanced tricks, in-depth explanations of the underlying mechanisms, and a discussion on users’ feature requests.
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https://fontstand.com/conference/

Fontstand International Typography Conference 2025, The Hague, the Netherlands

Fontstand’s fifth annual typography conference returns to The Hague! Join world-class type designers and typographers from around the world for a packed tw...

Fontstand International Typography Conference

@jaf Nice! JAF Cupidus was kerned with Kern On.

Did you know? The Cupidus italics are entirely autokerned (and partly autospaced) on the basis of the uprights, without any additional manual input. 😎

@colinmford Yes, Kern On applies a threshold. While doing so, it takes into account the deviation (as you describe) as well as the frequency: infrequent pairs are given somewhat more tolerance than frequent pairs.
@colinmford Yes, this is how it works. It just means that the step of the process when kerning groups are automatically created is skipped and instead, the manual ones are loaded (of course, the “manual” ones may in fact be generated by Kern On in a previous session).

With yesterday’s update, Kern On supports manually set kerning groups. It took me a while to get it but it’s conceptually fairly easy:

• Kern On no longer erases existing kerning groups as it starts.
• As before, while KO is running, it only generates glyph-glyph pairs on-the-fly. The kerning groups are left unused.
• After pushing the “Kern On” button, you can select whether you want to re-generate the kerning groups. If not, Kern On will use your manually set groups.

https://kern-on.com/update/

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