A fast, native outliner. Now smooth on large outlines, with refined keyboard shortcuts. Markdown, images, iCloud sync. One-time purchase.
Kosshi is a fast, native outliner. Simple and smooth on large outlines.
Outliner
Hit Tab to indent and build a hierarchy. Collapse what you don't need, drag to move things around.
Zoom In / Zoom Out
Zoom into any row and only its contents are shown. Breadcrumbs tell you where you are, and you can jump home anytime.
Markdown
Bold, links, checkboxes, and more render right where you type. Formatting markers only appear while editing — move away and they're gone.
Images & Files
Add images by pasting or dragging, and resize however you want. PDFs and videos show as inline previews too.
Search
Cmd+F to search your whole outline. Matches get highlighted. Replace works too.
Dark Mode
Switch between light and dark themes. Automatically follows your system setting.
Tags
Use #tags to categorize and @tags for dates or status. Filter from the sidebar.
Bookmarks
Press Cmd+D to bookmark a row. Bookmarks appear at the top of the sidebar.
Reminders & Calendar
Any @tag with a date syncs to Apple Reminders or Calendar. Use @todo(3/15), @meeting(every monday 10:00), and so on.
Keyboard Shortcuts
Collapse, move, indent — all without reaching for the mouse.
Export
Export as Markdown, OPML, or plain text. Your data is never locked in.
Auto Backup
Restore past outlines from daily backups. Feel free to delete outlines you no longer need.
iCloud Sync
When iCloud is available, your outlines sync across Apple devices via CloudKit. Data is stored in your iCloud account, and the developer cannot access its contents.
Pay Once
Built natively for speed. Launches quickly and works offline. One-time purchase, no subscription, no account required. A 7-day free trial is available.
Feedback
Feature requests and bug reports are always welcome. Reach us via the contact form at https://kosshi.app/contact or on X at @shirokumamake.
Ratings & Reviews
This app hasn’t received enough ratings or reviews to display an overview.
Fixed text disappearing while typing in Japanese, plus a few rough edges around the cursor row.
- Fixed text loss during Japanese IME composition (characters could vanish without pressing delete)
- Fixed flickering of marked text mid-composition
- Fixed the row below the editing line jumping when a line wraps to a new visual line
Version 1.7.2
The developer, Junichi Sato, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More