# Kosshi Outliner — Markdown, images, device sync > Fast, native outliner for Mac, iPhone, and iPad with Markdown and iCloud sync. (iPhone/iPad app by Junichi Sato.) - Source: https://appshunter.io/ios/app/kosshi-outliner/id6759483880 (this page in markdown: same URL + `.md`) - Developer: [Junichi Sato](https://appshunter.io/developer/1617496266) - Category: Productivity, Utilities - Price: Free with in-app purchases - Rating: 5.00/5 from 4 App Store ratings · 5 written reviews indexed - Age rating: 4+ - Requires: iOS 17.0 · 19 MB - Languages: American English, French (France), German (Germany), Italian, Japanese, Korean, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan) - Released: 2026-04-02 - Data updated: 2026-08-20 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/kosshi-outliner/id6759483880/reviews.md ## What is Kosshi Outliner? Kosshi is a fast, native outliner. Simple and smooth on large outlines. Available on Mac, iPhone, and iPad — one purchase covers all three. Outliner Hit Tab to indent and build a hierarchy. Collapse what you don't need, drag to move things around. Zoom In / Zoom Out Zoom into any row and only its contents are shown. Breadcrumbs tell you where you are, and you can jump home anytime. Markdown Bold, italic, highlight, links, checkboxes, code blocks, and LaTeX math all render right where you type. Formatting markers only appear while editing — move away and they're gone. Images & Files Add images by pasting or dragging, and resize however you want. PDFs and videos show as inline previews too. Apple Pencil Sketches Draw sketches with Apple Pencil on iPad. They sync to Mac and iPhone through iCloud. Search Cmd+F to search your whole outline. Matches get highlighted. Replace works too. Dark Mode Switch between light and dark themes. Automatically follows your system setting. Tags Use #tags to categorize and @tags for dates or status. Filter from the sidebar. Internal Links Type [[ to search and link to another row. Build a web of connected outlines. Bookmarks Press Cmd+D to bookmark a row. Bookmarks appear at the top of the sidebar. Prose Mode Switch a row to Prose Mode for long-form writing. Bullets disappear and children stay expanded. Reminders & Calendar Any @tag with a date syncs to Apple Reminders or Calendar. Use @todo(3/15), @meeting(every monday 10:00), and so on. Keyboard Shortcuts Collapse, move, indent — all without reaching for the mouse. Export Export as Markdown, OPML, or plain text. Your data is never locked in. Auto Backup Restore past outlines from daily backups. Feel free to delete outlines you no longer need. iCloud Sync When iCloud is available, your outlines sync across Apple devices via CloudKit. Data is stored in your iCloud account, and the developer cannot access its contents. Pay Once Built natively for speed. Launches quickly and works offline. One-time purchase covers Mac, iPhone, and iPad — no subscription, no account required. A 7-day free trial is available. Feedback Feature requests and bug reports are always welcome. Reach us via the contact form at https://kosshi.app/contact or on X at @shirokumamake. ## Key features - Hierarchical outlining with indentation - Zoom into specific rows - Markdown formatting - Image and file embedding - Apple Pencil sketches - Internal linking - Reminders and calendar sync ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Kosshi Outliner | $24.99 | one-time | ## Recent user reviews (5 of 5) All indexed reviews: https://appshunter.io/ios/app/kosshi-outliner/id6759483880/reviews.md ### 5/5 — Great start *2026-07-28* This is an excellent app so far. I’m excited to see where it goes over the next few months. It’s already entirely useable and really fills a space in the iOS and Mac OS cross compatible offline outline apps that no other app fills currently. ### 5/5 — Top Notch Outliner *2026-07-25* I love outliners. I love native Mac apps, and I love keeping my data on my computer, not in the cloud. This checks all the boxes, and is remarkably stable for a new app. I love the single file data base approach. This is as close as Mac has come to GrandView - still the best of them all. 

The iPad version has a little catching up to do with the Mac version, especially in find and filter, (the found items are highlighted, but sometimes are not seen in the window as you step through them, filter doesn’t always work) but I am sure that will be fixed soon. Kosshi has already surpassed the competition.
 The Desktop version is 5 stars and the iPad version is 3 stars, so I am giving it 4. Edit: I think the iPad problems were user error. I am changing this review to 5 stars. For my personal use, notes like OmniOutliner would make it perfect, but that is the only change (I won’t call it an improvement) I would like to see. ### 4/5 — Top Notch Outliner *2026-07-08* I love outliners. I love native Mac apps, and I love keeping my data on my computer, not in the cloud. This checks all the boxes, and is remarkably stable for a new app. I love the single file data base approach. This is as close as Mac has come to GrandView - still the best of them all. 

The iPad version has a little catching up to do with the Mac version, especially in find and filter, (the found items are highlighted, but sometimes are not seen in the window as you step through them, filter doesn’t always work) but I am sure that will be fixed soon. Kosshi has already surpassed the competition.
 The Desktop version is 5 stars and the iPad version is 3 stars, so I am giving it 4 ### 5/5 — Great potential *2026-07-04* This app has a lot of potential. I love the design; it is kind of like an offline Workflowy, which is not a bad thing. The developer is accessible and responsive, and I have seen the app improve tremendously since I first got it. I am looking forward to watching it grow. ### 5/5 — Excellent outliner *2026-05-27* I used to use an online outliner that was subscription based and lacked end-to-end encryption, which I was never very happy about. It was great to find this app that supports huge outlines and syncs fast over iCloud between devices and is a one-time purchase. Thank you! ## Frequently asked questions about Kosshi Outliner ### What is Kosshi Outliner? Kosshi Outliner is a fast, native outliner application designed for Mac, iPhone, and iPad. It helps users organize thoughts and ideas with a hierarchical structure, Markdown support, and seamless iCloud synchronization. ### Is Kosshi Outliner free? Yes, Kosshi Outliner is free to download and use. A one-time purchase is available for advanced features and to support development, covering all three Apple platforms. ### Does Kosshi Outliner have ads? No, Kosshi Outliner is ad-free. The app focuses on providing a clean and uninterrupted user experience for organizing thoughts. ### What devices is Kosshi Outliner available on? Kosshi Outliner is available on Mac, iPhone, and iPad. A single purchase unlocks the app across all these Apple devices. ### How does Kosshi Outliner sync data? Kosshi Outliner uses iCloud via CloudKit for syncing. Your outlines are stored in your iCloud account, ensuring data is accessible across your Apple devices and the developer cannot access its contents. ### Can I export my outlines from Kosshi Outliner? Yes, you can export your outlines from Kosshi Outliner in multiple formats, including Markdown, OPML, and plain text. This ensures your data is not locked into the application. ### Does Kosshi Outliner support collaboration? While Kosshi Outliner focuses on individual organization and syncs via iCloud, it does not currently offer real-time collaboration features. Its primary strength lies in personal productivity and thought organization. ### How often is Kosshi Outliner updated? Kosshi Outliner was last updated on June 15, 2026, with version 1.12.0. The developer actively welcomes feature requests and bug reports, suggesting a commitment to ongoing development and improvements. ## Version history (last 5 releases) ### 1.17.1 — 2026-08-15 - Fixed display and selection issues when switching between a row title and its note - Fixed note tags not updating correctly in Reminders and the sidebar ### 1.17.0 — 2026-08-13 Add notes to any row. Notes support Markdown and tags. - Save a search and its zoom position to the sidebar, then return to the same view anytime - Open large outlines faster, with more responsive moves and deletes across many rows - Select an entire row with a triple-tap - Fixed the edit menu appearing unexpectedly or remaining open - Fixed iCloud sync remaining enabled after importing large OPML files ### 1.16.1 — 2026-08-09 - Fixed issues with Markdown link syntax - Fixed bold not using the chosen font, and bold overlapping highlight breaking display and export - Fixed rows being drawn in the wrong place after expanding or collapsing under a filter - Images from the web now always load, and the setting for it is gone - Faster sidebar scrolling ### 1.16.0 — 2026-08-08 Markdown image syntax now pulls in images from the web and displays them in your outline. - Merge windows into tabs on macOS - Choose the text and code fonts in iOS settings - Fixed printing and exporting not matching what the filter shows - Fixed double-click and Option+Arrow selecting an entire line in Japanese, Chinese, and Thai - Fixed the free trial showing one day less than it had left - Fixed indented plain text losing its structure when pasted - Fixed broken image links when exporting to Markdown or TextBundle - Many other improvements and bug fixes ### 1.15.5 — 2026-08-03 This update fixes one issue. - Fixed the sidebar scrolling back to the top when you select an item in it ## More apps by Junichi Sato - [MofuMofu Dice](https://appshunter.io/ios/app/mofumofu-dice/id6756223749) All apps by Junichi Sato: https://appshunter.io/developer/1617496266 ## Related topics [outliner](https://appshunter.io/ios/topics/outliner) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-20.*