CotEditor is a light-weight, neat, yet powerful text editor designed for editing plain-text files such as web pages (HTML, CSS), program source codes (Python, Ruby, Perl, etc.), structured texts (Markdown, Textile, TeX, etc.), or any other kind of plain-text.

The application is exactly made for macOS. CotEditor looks and behaves just as macOS applications should. It means, you already know how to use it even on the first launch. There are no complex configuration files that require geek knowledge so that you can access all your settings including syntax definitions and themes from a standard preferences window.

CotEditor launches so quick that you can write your text immediately when you want to. It's perfect for you to write a draft version of your document or a scratch code. The simply organized user interface doesn't disturb your task. However, at the same time, CotEditor is neither a software only for beginners nor a typical minimal “zen-style” editor. It is fully customizable. There are, of course, syntax highlighting feature for various languages, find and replace with the regular expression, auto-indentation, command-line tool, and lots of other deep functions. You can also easily write your own macro in your favorite languages.

Features:

• Syntax highlighting including more than 50 preset languages
• Powerful find and replace with the regular expression
• Auto-backup with/without overwriting actual document files
• Line numbers view
• Live character/word/line count
• Handling file encoding and line endings with care
• Auto-generated outline menu for fast navigation
• Character inspector that shows the zoomed glyph and Unicode information
• Vertical text layout mode
• Various Unicode normalizations
• Semi-transparent window
• Command-line tool
• Scriptable with your favorite language
• JCK-languages friendly
• RTL writing direction support

Versions:
• Download is for version 3.7.7 for macOS 10.12.2+
• Version 4.0.3 for macOS 10.15+ via the Mac App Store
• Version 3.5.4 for OS X 10.11-10.12.1
• Version 3.2.8 for OS X 10.10
• Version 2.5.7 for OS X 10.8-10.9
• Version 1.5.4 for OS X 10.7
• Version 1.3.1 for OS X 10.4-10.6
• Version 1.0.1 for OS X 10.3

Requirements:
macOS 10.12.2+
64-bit Intel