CotEditor

CotEditor is a macOS text editor for working with plain-text files, scripts, and markup. It keeps familiar desktop editing conventions while adding tools for syntax, search, and text encodings.

Who it is for

Mac users who need a capable plain-text editor without committing to a full development environment.

What stands out

• Syntax highlighting for code and markup.
• Regular-expression find and replace.
• Tools for encodings and inspecting characters.

Before you install

• It is a plain-text editor, not a rich-text word processor.
• For integrated debugging or a large extension marketplace, a development-focused IDE may be a better fit.

Price & availability

Free on the Mac App Store. Check the store listing for the current macOS requirement.

Sources & verification

Official product information checked on October 18, 2026. This is a researched app profile, not a hands-on performance benchmark. Store prices and requirements can change.

• Official features ↗
• Project repository ↗