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Kosshi

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Simple, fast, and native outliner for macOS and iOS for structured thinking and task management.

Note-TakingTask ManagementProductivity
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Tracked since2026
0 reviews tracked

The Bottom Line

Entry price

Paid plans only

Biggest pro

Exceptional performance and responsiveness, even with very large outlines.

Biggest con

Only available for Apple devices (macOS and iOS).

TL;DR - Kosshi

  • Native macOS/iOS outliner for hierarchical organization.
  • Fast and responsive, designed for large outlines with 100,000+ rows.
  • Supports Markdown, media embedding, iCloud sync, and Apple Reminders integration.
Pricing: Paid only
Best for: Enterprises & pros

What is Kosshi?

Editorial review
Kosshi is a native outliner application designed for macOS and iOS, offering a fast and responsive experience for organizing thoughts, notes, and tasks in a hierarchical structure. Built on Apple frameworks, it prioritizes performance, allowing users to manage large outlines with tens of thousands of rows without sacrificing speed or responsiveness. The application supports features like zooming into specific rows, rich text formatting with Markdown, and embedding images and files directly within outlines. Kosshi is ideal for individuals who need a robust tool for structured thinking, project planning, note-taking, and task management. Its deep integration with Apple's ecosystem, including iCloud for sync and Apple Reminders/Calendar for date-based tasks, makes it particularly suitable for Apple users. The pay-once model and local data storage with iCloud sync emphasize user privacy and a commitment to a subscription-free experience.

Available on: macOS, iOS

how we evaluateSourcekosshi.app ↗

Pros & Cons

Pros

  • Exceptional performance and responsiveness, even with very large outlines.
  • Native macOS and iOS experience with deep Apple ecosystem integration (iCloud, Reminders, Calendar).
  • One-time purchase with no subscription, offering long-term value.
  • Strong focus on user privacy with local data storage and no developer servers for sync.
  • Flexible outlining capabilities for various use cases from note-taking to task management.

Cons

  • Only available for Apple devices (macOS and iOS).
  • No collaboration features mentioned, likely a single-user tool.
  • Markdown formatting markers are hidden when not editing, which might require a slight learning curve for some users.

Key Features

Hierarchical outlining with indenting and collapsingZoom into any row to focus on its contentMarkdown support for rich text formattingEmbed images, PDFs, and videos with inline previewsGlobal search and replace within outlinesDark mode supportTagging with #tags and @tags for categorization and datesBookmarks for quick access to important rows

Pricing Plans

Free Trial

Pricing checked Jul 12, 2026

Kosshi Outliner

$24.99 one-time purchase

  • Native app
  • iCloud sync and privacy
  • Large outlines support
  • Markdown support
  • Images & files support
  • Search
  • Dark mode
  • Tags
Calculate your costView full pricing

Is Kosshi worth the price?

90/100

The one-time purchase of $24.99 for Kosshi Outliner is very fair and generous, especially for a native macOS and iOS app with iCloud sync.

This pricing model is excellent for users who prefer to own their software outright rather than subscribe, offering long-term value. It's best for individuals seeking a robust, one-time purchase outlining tool.

Hidden Costs & Gotchas

No hidden costs identified

Future major version upgrades might be paid

No team collaboration features

How Kosshi Compares to Competitors

Compared to subscription-based outliners like OmniOutliner, which can cost $9.99/month or $99.99/year, Kosshi's $24.99 one-time fee is significantly more affordable in the long run. Even against other one-time purchase apps, $24.99 for a native, feature-rich outliner across two platforms is highly competitive and offers superior value.

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Kosshi FAQ

How does Kosshi handle data synchronization between my Mac and iPhone?

Kosshi uses Apple's iCloud (specifically CloudKit) for synchronization between your macOS and iOS devices. Your data is stored locally on your device and synced through your personal iCloud account, meaning it never passes through any developer-owned servers.

What makes Kosshi particularly fast and responsive, especially with very large outlines?

Kosshi is built as a native app using Apple frameworks with a custom-written rendering engine. Its data structures and layout engine are specifically optimized to maintain responsiveness for operations like typing, moving rows, collapsing, scrolling, editing, and searching, even when outlines contain over 100,000 rows.

Can I use Kosshi for task management, and how does it integrate with other Apple services for this purpose?

Yes, Kosshi supports task management through its tagging system. You can use @tags with dates (e.g., @todo(3/15), @meeting(every monday 10:00)) which will automatically sync to Apple Reminders or Calendar, allowing you to manage your tasks and events within your existing Apple ecosystem.

What are the export options available in Kosshi, and for what purposes might I use them?

Kosshi allows you to export your outlines in Markdown, OPML, or plain text formats. These options are useful for sharing your outlines with others, migrating your data to other applications that support these formats, or for archival purposes.

Does Kosshi offer any form of version control or recovery for my outlines?

Yes, Kosshi includes an auto-backup feature that allows you to restore past versions of your outlines from daily backups. This provides a safety net for accidental deletions or unwanted changes.

Source: kosshi.app

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