Outline editing
Create hierarchical outlines with Tab-based indentation, collapse sections you do not need, and drag rows to reorganize them.
Native outliner for Apple devices
Kosshi is a native outliner for macOS and iOS that is built for fast, focused outline editing. It lets you keep projects, journals, tasks, and notes in a single outline and work with hierarchy through indentation, collapse and expand, moving rows, and zooming into a row when you want to narrow attention.
The app stores data locally on the device and syncs through Apple’s iCloud using CloudKit, so sync data stays in the user’s iCloud account instead of passing through a developer server. Kosshi is sold as a one-time purchase with a 7-day free trial, and the site says there is no subscription and no account required.
Features
Zoomed focus
Zoom into a single row so only its contents are shown, with breadcrumbs for orientation and a quick way back home.
Inline Markdown
Markdown formatting such as bold, links, and checkboxes renders inline while you type, with markers hidden when you leave the row.
Rich attachments
Attach images by pasting or dragging, resize them, and preview PDFs and videos inline.
Search and replace
Search the whole outline with Cmd+F, highlight matches, and replace text when needed.
Organization tools
Use tags, bookmarks, reminders, and calendar dates to organize work and surface important rows in the sidebar.
Common use cases
Personal knowledge and planning
Keep projects, journals, tasks, and notes in one outline when you want a single place to organize ongoing work instead of multiple files or separate apps.
Structured note taking
Use hierarchical rows, collapse, zoom, bookmarks, and tags to manage multi-level notes or research outlines without losing structure.
Task management with dates
Treat date tags and Apple Reminders or Calendar sync as a lightweight task workflow for dated actions such as meetings or recurring follow-ups.
Large outline organization
Work with long-running outlines that grow over time, where fast scrolling, search, and editing matter as the outline reaches tens of thousands of rows or more.
Apple-device continuity
Use the same app on Mac and iPhone with iCloud sync when you want your outline available across Apple devices without account signup.
Pros and Cons
Pros
- Native Apple app built with SwiftUI, AppKit, and UIKit for direct integration with the operating system.
- Designed to stay responsive during frequent editing actions such as typing, moving rows, collapsing, expanding, and zooming.
- Built for very large outlines, with the site describing responsiveness beyond 100,000 rows and design work aimed at a one-million-row benchmark.
- Stores data locally and syncs via iCloud/CloudKit, keeping sync data in the user’s iCloud account.
- Includes export options for Markdown, OPML, and plain text.
Cons
- Runs only on macOS and iOS, so it is not a cross-platform choice for Windows, Android, or Linux users.
- The site positions it as a personal thinking tool, so teams that need real-time collaboration may prefer a web-based outliner.
FAQ
What platforms does Kosshi support?
Kosshi is a native outliner for macOS and iOS. It is built with Apple frameworks and syncs between devices through iCloud/CloudKit.
How is Kosshi priced?
The site shows a $24.99 one-time purchase with a 7-day free trial, and says there is no subscription and no account required.
How does syncing and privacy work?
Kosshi stores data locally on each device and uses Apple's CloudKit for sync, so sync data lives in the user's iCloud account rather than on a developer server.
Can I export my outline from Kosshi?
Yes. Kosshi supports exports as Markdown, OPML, or plain text.
Is Kosshi designed for team collaboration?
The website frames Kosshi as a personal thinking tool rather than a collaboration app, and notes that teams needing cross-platform access or real-time collaboration are better served by a web-based tool.
Quick Facts
- Category
- Productivity
- Platform
- macOS and iOS
- Product type
- Native outliner
- Pricing
- $24.99 one-time purchase with a 7-day free trial
- Sync
- iCloud / CloudKit
- Exports
- Markdown, OPML, plain text
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