Kosshi Outliner review
A capable offline Markdown outliner for Apple users, without collaboration features.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Kosshi Outliner is a native outlining app for macOS, iPhone, and iPad. It is designed for writers, researchers, planners, and other Apple users who want to organize material in a single hierarchical outline. Rows can be indented, moved, collapsed, or opened in a focused view with breadcrumbs. Offline access is supported, while optional iCloud sync keeps outlines available across supported Apple devices.
The app’s standout feature is the depth of its outline and document tools. Markdown support includes links, checkboxes, tables, code blocks, and math, while internal links connect outline rows. Tags, bookmarks, saved searches, Boolean filters, and text replacement support larger working documents. Images, PDFs, videos, and handwritten sketches can be included, and outlines can be imported or exported in Markdown, Rich Text, TextBundle, plain text, and OPML. Automatic backups and restore add protection for locally stored work.
Kosshi Outliner has one paid plan: Kosshi Outliner costs $24.99 as a one-time purchase and provides full feature access without a subscription. The published offering includes a seven-day free trial; afterward, the app becomes read-only. Apple Reminders, Apple Calendar, and iCloud provide useful ecosystem connections, but the product remains focused on Apple platforms and does not support collaboration. Choose it for detailed personal outlining, offline work, and Markdown-based organization across Apple devices. Choose an alternative if shared editing, broader platform coverage, or team workflows are central requirements.
Kosshi Outliner pros and cons
- Where it wins
- Detailed hierarchical outlines with collapse, zoom, search, and filters
- Markdown, internal links, tags, media, backups, and multiple export formats
- One-time purchase with optional iCloud sync across Apple devices
- Where it doesn't
- No collaboration features for shared outlining or editing
- Available only on macOS and iOS devices
- Seven-day trial becomes read-only after the trial period
Kosshi Outliner fact sheet, pricing and score →
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