Freedom251 › Outliner Software
Kosshi Outliner
What Kosshi Outliner is
Kosshi Outliner is a personal outliner for collecting notes, thoughts, and tasks across projects in one expandable structure. You organize rows with indentation and movement, then use collapsing, search, filters, bookmarks, saved searches, or zooming into a row and its children. Editing supports Markdown, checkboxes, keyboard shortcuts, and zooming. Images, PDFs, and videos can be attached, and outlines can be exported as Markdown, Rich Text, TextBundle, plain text, or OPML. Dated @tags can sync with Apple Reminders or Calendar. The app works offline on macOS and iOS, including iPhone and iPad, and can synchronize through iCloud CloudKit. Data is stored in a local SQLite database on each device, with optional private CloudKit syncing. Kosshi says its structures remain usable beyond 100,000 rows and that it collects no analytics or usage data. Collaboration and shared outlines are unsupported. The one-time price is $24.99 USD, with a seven-day trial that becomes read-only until purchase.
Who it suits
Kosshi suits Apple-device users who want one structured outline for notes, tasks, and project material. It fits offline work and large personal outlines, but not teams needing shared editing.
What it does well
- Supports Markdown, checkboxes, and shortcuts
- Attaches images, PDFs, and videos
- Exports to Markdown, OPML, and text formats
- Works offline on macOS and iOS
- Syncs through private iCloud CloudKit
What to know first
- No Windows or Android version planned
- Shared outlines and collaboration are unsupported
- Seven-day trial becomes read-only
- No Advanced Data Protection end-to-end encryption
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Kosshi Outliner | One-time purchase; no subscription · 7-day free trial · Trial switches to read-only mode · App Store purchase unlocks all features | $24.99, paid once |
As kosshi.app lists them, read 7 Oct 2026. The maker's own page has the final word.
Verdict
Kosshi Outliner offers a large, searchable personal outline with Apple-device syncing, offline access, and broad export options. Its Apple-only scope, read-only trial limit, and lack of collaboration matter when selecting it.
Facts from Kosshi Outliner's own pages
- 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. · kosshi.app, 7 Oct 2026
- Collaboration limit
- Shared outlines and collaboration are not supported. · kosshi.app, 7 Oct 2026
- Editing
- The app supports Markdown formatting, checkboxes, keyboard shortcuts, and zooming into a row and its children. · kosshi.app, 7 Oct 2026
- Files and export
- Users can add images, PDFs, and videos to an outline and export as Markdown, OPML, or plain text. · kosshi.app, 7 Oct 2026
- Headquarters
- Japan · kosshi.app, 28 Sept 2026
- Integrations
- Dated @tags can sync with Apple Reminders or Calendar; Kosshi also syncs outlines across Apple devices through iCloud CloudKit. · kosshi.app, 7 Oct 2026
- Maker
- Kosshi is a solo project by Junichi Sato, who goes by Shirokuma. · kosshi.app, 7 Oct 2026
- Outline model
- Everything goes into a single outline that users organize with indentation, row movement, collapsing, and search. · kosshi.app, 7 Oct 2026
- Platform limit
- Kosshi runs on macOS and iOS, and the FAQ says there is no Windows or Android version planned at this time. · kosshi.app, 7 Oct 2026
- Purpose
- Kosshi is a personal outliner for gathering notes, thoughts, and tasks across projects. · kosshi.app, 7 Oct 2026
- Scale
- Kosshi says its rendering and data structures are designed to keep outlines usable beyond 100,000 rows. · kosshi.app, 7 Oct 2026
- 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. · kosshi.app, 7 Oct 2026
- 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. · kosshi.app, 7 Oct 2026
- Support
- Users can contact the developer about problems, and the site also provides a forum for release discussions and feedback. · kosshi.app, 7 Oct 2026
- Trial limit
- After the seven-day trial, the app switches to read-only mode until a one-time purchase unlocks its features. · kosshi.app, 7 Oct 2026
Where Kosshi Outliner stands on Freedom251
- Outliner Software#28 of 31