Gravity vs Kosshi Outliner
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gravity
This app offers a streamlined note-taking experience by eliminating folders and tags, focusing on a single, continuous stream of thoughts. Capture ideas instantly and use simple gestures to manage your notes, prioritizing what matters most.
- Instant note capture
- Single stream organization
- Swipe gestures for actions
- Attention-based prioritization
- Private iCloud sync
- Lightweight prefixes for filtering
- Fast search functionality
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Gravity keeps all your notes in one stream, with the newest at the top. As you add more, older notes sink down the list. When one of them still matters, swipe it right and it comes back to the top. The idea comes from Andrej Karpathy's append-and-review note: write everything in one place, read back through it now and then, and move up whatever you still care about. Gravity has no folders, so there's nothing to file. Writing The cursor is waiting at the top when you open the app. Type your note and press Return twice, or tap the add button. A half-written draft stays where you left it. Rescuing and tidying Swipe right on a note to rescue it. Swipe left to archive, delete, share or copy. Archived notes have a page of their own, and deleted notes stay in Deleted Notes until you restore them or clear them out. Markdown and checklists Headings, bold, italics, lists, links and quotes show formatted in the stream. Start a line with "- [ ]" to make a checklist, then tick items off without opening the note. In the editor the formatting appears as you type, and a small bar above the keyboard adds headings, bold, lists and checklists. Everything is saved as plain Markdown text. Tags Start a note with todo:, idea:, read: or any word followed by a colon, and it gets a colour of its own. Type todo: into search to see only those notes. There's no tag manager to look after. Search Search covers every note on your phone, archived ones too, and works offline. It matches parts of words and ignores accents. Getting notes in The Home Screen widget starts a new note or pastes in whatever you last copied. You can also share text or a link from another app, and it becomes a new note at the top of the stream. Privacy Your notes are stored on your iPhone. Gravity has no accounts and no analytics, and it doesn't collect any data. If you want your notes on your other Apple devices, turn on iCloud sync; it also works with Gravity for Mac, which is sold separately. You can export everything as JSON or Markdown at any time. Looks Choose light, dark or OLED black, or follow the system, and pick from three text sizes. There's a stats page too, worked out on your phone, of course. Price You pay once. There's no subscription, no in-app purchases and no ads. Privacy policy: https://www.gravitynotes.app/privacy-policy
Kosshi Outliner
This native outliner app allows you to organize thoughts with a hierarchical structure, zoom into specific sections, and format text using Markdown. It supports images, sketches, internal links, and reminders, with seamless iCloud sync across Apple devices.
- Hierarchical outlining with indentation
- Zoom into specific rows
- Markdown formatting
- Image and file embedding
- Apple Pencil sketches
- Internal linking
- Reminders and calendar sync
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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.
Screenshots
Verdict
The clearest difference is price: Kosshi Outliner at Free against Gravity's $9.99. Kosshi Outliner also leads on update cadence (every 3 days vs every 11 days) and review sentiment (100% vs 92%). Gravity's advantage is in-app purchases (none vs 1) and chart position (#192 vs unranked). On rating, ratings volume, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Kosshi Outliner is free to download; Gravity costs $9.99 up front. Kosshi Outliner sells 1 one-off in-app purchase. Gravity asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Gravity against 5.0 for Kosshi Outliner. Both are backed by a comparable volume of ratings — 9 and 4 respectively. Written reviews are what separate them: 92% of Gravity's written reviews are positive against 100% of Kosshi Outliner's.
Gravity ships an update every 11 days, Kosshi Outliner every 3 days. Both last shipped on October 24, 2026.
| Parameter | Gravity | Kosshi Outliner |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 5.0 (9 ratings) | 5.0 (4 ratings) |
| Positive reviews | 91.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 9 — better | 4 |
| Update frequency | Every 11 days | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free — better |
| Best chart rank | #192 — better | — |
| Devices | iPhone, iPad | iPhone, iPad, Mac — better |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 36 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Tristan Manchester | Junichi Sato |
Customer experience
Gravity
Kosshi Outliner
In-app purchases
Gravity
No in-app purchases
Kosshi Outliner
- Kosshi Outliner$24.99








