system requirements: macOS 15 and later
New Features
- Support macOS Tahoe 26.
Improvements
- Change the system requirement to macOS Sequoia 15 and later.
- Update the user interface on macOS 26 to the Liquid Glass style.
- Update the application icon to the Liquid Glass style.
- The options to highlight matching braces have been removed and they are now always highlighted.
- Apply the text find highlighting to all split editors.
- Move selected items to the Trash by the Delete action in the file browser.
- Show also the file size of the previewed document in the status bar.
- Display the numbers of registered items below the lists in the syntax editor.
- Deprecate the feature to change the editor opacity per window.
- Deprecate the feature of installing a custom theme by simply opening the file in CotEditor.
- Deprecate the “Make Snake Case,” “Make Camel Case,” “Make Pascal Case,” “Hiragana to Katakana,” and “Katakana to Hiragana” commands in the Text > Transformations menu.
- Deprecate the “Draw separator” option for the line number view on macOS 26.
- [trivial] Rename the “Half-width to Full-width” and “Full-width to Half-width” commands to “Convert to Full Width” and “Convert to Half Width”, respectively.
- [trivial] Improve the behavior of Add/Remove buttons.
- [trivial] Update the layout of the “What’s New” window.
- [dev] Migrate the theme list and syntax list in the Settings, and the input fields in the Find window to SwiftUI.
- [dev] Update the build environment to Xcode 26.0 RC (Swift 6.2, macOS 26 SDK).
- [non-AppStore ver.] Add an update badge to the “Check for Update” menu item if an update is available.
- [non-AppStore ver.] Update Sparkle from 2.7.1 to 2.8.0-beta.3.
Fixes
- Fix an issue where the “Convert Indentation” commands don’t convert indentation to the indent style that’s not the default.
- Fix an issue where the Syntax toolbar menu is disabled when the toolbar is shown afterward.
- Fix an issue where the size of the Multiple Replace window is not stored.
- Fix an issue in the Dutch localization where the number of found items isn’t displayed in the Find window.
Full Changelog: 5.2.3...6.0.0