The updater's “Install” button works only on CotEditor 3.3.0 and later.
To update from an earlier version, download archive from and install it manually.

What's New on CotEditor 3.4.2



  • trivial: Let input fields in preferences support dark mode (hidden option on the current systems).
  • non-AppStore ver.: Update Sparkle framework.


  • Fix an issue under OS X 10.11 where the application crashed with the auto completion.
  • Fix an issue where some syntax keywords were not highlighted correctly.
  • Improve general stability.
  • trivial: Fix drawing of capsules for variables in the insertion format setting field.

previous release notes