Kosshi Outliner

Spec sheet

Purpose

Kosshi is a personal outliner for gathering notes, thoughts, and tasks across projects.Read 7 Oct 2026 · kosshi.app

Integrations

Dated @tags can sync with Apple Reminders or Calendar; Kosshi also syncs outlines across Apple devices through iCloud CloudKit.Read 7 Oct 2026 · kosshi.app

Security

The developer says it has no server-side access to users' private CloudKit records and does not currently support end-to-end encryption through Advanced Data Protection.Read 7 Oct 2026 · kosshi.app

Support

Users can contact the developer about problems, and the site also provides a forum for release discussions and feedback.Read 7 Oct 2026 · kosshi.app

Headquarters

JapanRead 28 Sep 2026 · kosshi.app

Maker

Kosshi is a solo project by Junichi Sato, who goes by Shirokuma.Read 7 Oct 2026 · kosshi.app

App privacy

The app does not collect analytics or usage data, and the developer says it does not collect, transmit, or access users' app data.Read 7 Oct 2026 · kosshi.app

Collaboration limit

Shared outlines and collaboration are not supported.Read 7 Oct 2026 · kosshi.app

Editing

The app supports Markdown formatting, checkboxes, keyboard shortcuts, and zooming into a row and its children.Read 7 Oct 2026 · kosshi.app

Files and export

Users can add images, PDFs, and videos to an outline and export as Markdown, OPML, or plain text.Read 7 Oct 2026 · kosshi.app

Outline model

Everything goes into a single outline that users organize with indentation, row movement, collapsing, and search.Read 7 Oct 2026 · kosshi.app

Platform limit

Kosshi runs on macOS and iOS, and the FAQ says there is no Windows or Android version planned at this time.Read 7 Oct 2026 · kosshi.app

Scale

Kosshi says its rendering and data structures are designed to keep outlines usable beyond 100,000 rows.Read 7 Oct 2026 · kosshi.app

Storage

Outline data is stored in a local SQLite database on each device, with optional sync through a private CloudKit database in the user's iCloud account.Read 7 Oct 2026 · kosshi.app

Trial limit

After the seven-day trial, the app switches to read-only mode until a one-time purchase unlocks its features.Read 7 Oct 2026 · kosshi.app

Plans and prices

Every Kosshi Outliner plan and price →

Where Specifiction places it

• Outliner Software#15 of 318.0