Product upvotes vs the next 3
Product comments vs the next 3
Product upvote speed vs the next 3
Product upvotes and comments
Product vs the next 3
Kosshi
Simple, fast outliner for Mac and iPhone.
Kosshi is a simple native outliner for macOS and iOS. Fast and focused outline editing.
Top comment
Hello — I'm Junichi, and I made Kosshi. A few years ago I was writing a technical book and noticed that sketching the structure first made the writing go much more smoothly. Around the same time I was juggling several personal projects, with information drifting apart across different tools, and I started to want an outliner of my own. What I was after was something that worked the same way on Mac and iPhone, could place images alongside text, and kept its data on my own devices. I couldn't find it, so I made one. That's Kosshi. It's a native Mac and iOS app, with a rendering engine written from scratch, designed to stay smooth even with large outlines. Sync is over iCloud — no account, no server I run; your data lives only on your devices and in your iCloud. If you live in an outliner, I'd love to hear what you find.
About Kosshi on Product Hunt
“Simple, fast outliner for Mac and iPhone.”
Kosshi launched on Product Hunt on May 23rd, 2026 and earned 86 upvotes and 5 comments, placing #10 on the daily leaderboard. Kosshi is a simple native outliner for macOS and iOS. Fast and focused outline editing.
On the analytics side, Kosshi competes within Mac, Productivity and Writing — topics that collectively have 814.9k followers on Product Hunt. The dashboard above tracks how Kosshi performed against the three products that launched closest to it on the same day.
Who hunted Kosshi?
Kosshi was hunted by Junichi Sato. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Kosshi including community comment highlights and product details, visit the product overview.