Kosshi Outliner

Outline Your Thoughts Clearly

Free · In‑App Purchases

Kosshi is a simple, fast outliner. Write and build a hierarchy as you go. Outliner Hit Tab to indent and build a hierarchy. Collapse what you don't need, drag to move things around. Focus Mode 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. Lightweight, Fast & Pay Once Built for Mac and iPhone. Launches quickly and works offline. Buy it once and it's yours forever. No subscription, no account required.

Ratings & Reviews

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- Print support on macOS (Cmd+P) - You can now open any row in its own window from the sidebar - Copying now preserves images and formatting - Tighter row spacing - Sidebar now auto-hides on narrow windows - Fixed Tab/Enter interrupting text composition on iOS - Fixed iCloud sync overwriting newer local edits - Many other improvements and bug fixes

Version 1.3.0

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

    Information

    Seller
    • Junichi Sato
    Size
    • 6.3 MB
    Category
    • Productivity
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • iPad
      Requires iPadOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Shirokuma
  • Developer Website
  • Privacy Policy

    • More by Junichi Sato