# CotEditor

A lightweight plain-text editor for macOS with syntax highlighting and regex search, plus CJK-friendly features such as vertical text and encoding detection. It is free on the Mac App Store.
- Official site: https://coteditor.com/
- Category: Programming & Dev Tools
- Japanese UI: Yes
- Uses AI: No
- Web version: No
- Platforms: macOS
- Pricing type: 無料
- Free plan: Yes
- Price: Unverified
- Developer: CotEditor Project
- Checked on: 2026-11-05

## Key features

- 構文ハイライト
- 正規表現検索置換
- 縦書き
- 文字コード推定

## Sources

- https://coteditor.com/
- https://github.com/coteditor/CotEditor

Page: https://appnavi.dev/en/apps/coteditor/