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Kosshi Outliner

Kosshi Outliner

Outline Your Thoughts Clearly

3 ratings
3 reviews
🔧 Utilities
📊 Productivity
Free
In-App Purchases

Details

  • Released
  • Updated
  • April 2, 2026
  • July 5, 2026

Features

Developer

Junichi Sato
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Kosshi Outliner screenshot #1 for iPhone
Kosshi Outliner screenshot #2 for iPhone
Kosshi Outliner screenshot #3 for iPhone
Kosshi Outliner screenshot #4 for iPhone
iphone
ipad
🧾$24.99
In-App Purchase↘︎
⭐3
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📝1+ tags
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❓8 answered
FAQ↘︎
📦~ in 2 weeks
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About

This native outliner app allows you to organize thoughts with a hierarchical structure, zoom into specific sections, and format text using Markdown. It supports images, sketches, internal links, and reminders, with seamless iCloud sync across Apple devices.

✓Hierarchical outlining with indentation
✓Zoom into specific rows
✓Markdown formatting
✓Image and file embedding
✓Apple Pencil sketches
✓Internal linking
✓Reminders and calendar sync
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What's New in Kosshi Outliner

1.14.0

July 5, 2026

Set a maximum line width to keep outlines readable on large screens. New - Line Width setting limits the maximum text width; wide windows center the outline Improved - Find palette lists Home at the top of the hierarchy - Drag rows from the Find palette preview into the main editor Fixed - Keyboard shortcut assignments now allow combinations other than Command - Fixed inability to apply Bold, Italic, and other formatting while rows are selected - Fixed the caret moving to unintended positions during row selection and Undo - Fixed multi-row Tab indent going too deep - Fixed Settings not opening from the iPad sidebar gear button or Command+, - Fixed Undo and Redo keyboard shortcuts on iPad

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In-App Purchases

$24.99

Kosshi Outliner

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User reviews

Most RecentHighest RatedLowest Rated

Top Notch Outliner

I love outliners. I love native Mac apps, and I love keeping my data on my computer, not in the cloud. This checks all the boxes, and is remarkably stable for a new app. I love the single file data base approach. This is as close as Mac has come to GrandView - still the best of them all. 

The iPad version has a little catching up to do with the Mac version, especially in find and filter, (the found items are highlighted, but sometimes are not seen in the window as you step through them, filter doesn’t always work) but I am sure that will be fixed soon. Kosshi has already surpassed the competition.

The Desktop version is 5 stars and the iPad version is 3 stars, so I am giving it 4
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Max StoutMax Stout

Great potential

This app has a lot of potential. I love the design; it is kind of like an offline Workflowy, which is not a bad thing.

The developer is accessible and responsive, and I have seen the app improve tremendously since I first got it. I am looking forward to watching it grow.
iwritewordsiwritewords

Excellent outliner

I used to use an online outliner that was subscription based and lacked end-to-end encryption, which I was never very happy about. It was great to find this app that supports huge outlines and syncs fast over iCloud between devices and is a one-time purchase. Thank you!
Matt101zMatt101z

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FAQ

What is Kosshi Outliner?

Kosshi Outliner is a fast, native outliner application designed for Mac, iPhone, and iPad. It helps users organize thoughts and ideas with a hierarchical structure, Markdown support, and seamless iCloud synchronization.

Is Kosshi Outliner free?

Yes, Kosshi Outliner is free to download and use. A one-time purchase is available for advanced features and to support development, covering all three Apple platforms.

Does Kosshi Outliner have ads?

No, Kosshi Outliner is ad-free. The app focuses on providing a clean and uninterrupted user experience for organizing thoughts.

What devices is Kosshi Outliner available on?

Kosshi Outliner is available on Mac, iPhone, and iPad. A single purchase unlocks the app across all these Apple devices.

How does Kosshi Outliner sync data?

Kosshi Outliner uses iCloud via CloudKit for syncing. Your outlines are stored in your iCloud account, ensuring data is accessible across your Apple devices and the developer cannot access its contents.

Can I export my outlines from Kosshi Outliner?

Yes, you can export your outlines from Kosshi Outliner in multiple formats, including Markdown, OPML, and plain text. This ensures your data is not locked into the application.

Does Kosshi Outliner support collaboration?

While Kosshi Outliner focuses on individual organization and syncs via iCloud, it does not currently offer real-time collaboration features. Its primary strength lies in personal productivity and thought organization.

How often is Kosshi Outliner updated?

Kosshi Outliner was last updated on June 15, 2026, with version 1.12.0. The developer actively welcomes feature requests and bug reports, suggesting a commitment to ongoing development and improvements.