Rune is a native Mac text editor centered on a shared iCloud Drive scratch file, with automatic saving and merge-based synchronization across a user's Macs. It also provides plain-text cleanup, focused code and text editing, local version history, and terminal integration.
Rune is a small native text editor for Apple silicon Macs running macOS 27. Its central workflow is a single scratch file stored in iCloud Drive and shared across the user's Macs, alongside ordinary text-file editing.
The app saves as you type, maintains a recovery journal and 30 days of local versions, and merges changes from two Macs instead of silently overwriting one version. It is designed for quick notes, plain-text cleanup, and focused file edits rather than a full project workspace with a build system or debugger.
Every keystroke is written to disk within 300 milliseconds in a recovery journal, so a crash or force quit loses at most the last 300 milliseconds. Rune also keeps 30 days of local versions accessible through File › Revert To.
Rune uploads each version and fails rather than replacing a newer remote version. Non-overlapping edits are merged by line and word; overlapping changes remain visible as conflicts that can be resolved in the merge view or with keyboard commands.
Paste inserts unstyled text, while Paste Clean removes invisible characters, unusual spaces, and trailing whitespace. Clean Clipboard can rewrite clipboard contents from any app, and selected text or clipboard content can be appended to scratch.md through Services or Shortcuts.
The editor supports syntax highlighting for 33 languages, regular-expression find and replace, multiple carets, a minimap, Markdown heading navigation, and Sublime Text-compatible keys. It can import Sublime Text color schemes and fonts.
Show Scratch opens the scratch window from any app, tabs reopen after quitting, and a menu-bar panel provides access to recent files and cleanup commands. A command-line tool can open files, jump to a line, append to the scratch file, or act as an EDITOR.
Rune preserves file encoding, line endings, permissions, and extended attributes. It is not sandboxed, allowing it to open files directly, and reports save, upload, sync, and error states in its status line.
Keep a single scratch.md file available on each Mac for temporary notes, checklists, copied text, and other material that needs to follow you between machines.
Paste content from formatted sources as clean plain text, remove invisible characters and unwanted whitespace, or append selected text to the scratch file without leaving the current app.
Open a text or code file for a quick correction without managing a project workspace. Syntax highlighting, regex search, multiple carets, and Sublime Text-style commands support short editing sessions.
Use Rune as the editor for Git commit messages or open files from a terminal, including at a specified line. The command-line examples also support appending piped output to scratch.md.
Continue working after switching between Macs when both changed the same document. Rune merges non-overlapping changes and keeps overlapping alternatives visible for deliberate resolution.
Rune is a native text editor for Apple silicon Macs running macOS 27. It uses iCloud Drive to share one scratch file across Macs, with no Rune account or Rune-operated server required.
Create or open a text file in Rune. The app saves as you type, keeps tabs open after quitting, and can reopen files as native Mac tabs. Its Show Scratch shortcut brings the scratch window forward from another app.
Rune uses iCloud Drive and does not list other storage or sync services. The source describes one shared scratch file and synchronization across a user's Macs, rather than team or multi-user collaboration.
Rune offers a 7-day free trial on each Mac with all features included. After the trial, the app becomes read-only until purchased, while continuing to sync what was written. The listed license is a one-time $19 purchase for 3 Macs, with 30-day refunds and 1.x updates included.
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