Kosshi

Kosshi is an outliner—for the people who've tried everything else and still can't find something that just works. It's simple, fast, and native. No subscriptions, no accounts, no cloud servers touching your data. Just an app that does one thing incredibly well.

Here's the thing about outline apps—they're either Web-based bloatware that feels like a website pretending to be software, or they're ancient desktop apps that haven't been updated since 2003. Kosshi is neither. It's built from scratch on Apple's frameworks with a custom rendering engine, which means everything—typing, moving rows, collapsing—happens instantly. That's not a feature, that's the whole point. An outliner repeats these operations constantly, so response speed IS the product.

It handles massive outlines too. We're talking 100,000+ rows and it doesn't blink. The data stays local, syncs via iCloud (Apple's infrastructure, not some startup's AWS bill), and there's no monthly fee. You pay once, it's yours. Features like Markdown that renders inline but disappears when you're not editing, images and PDFs that preview natively, tags that filter and sync to Apple Reminders, bookmarks, dark mode that follows your system—this is a grown-up tool built by people who actually use outliners.

This is what tool-making looks like when someone asks "what do I actually need?" instead of "what can we ship?"