Tired of Bloated Note Apps, Indie Dev Builds Kosshi: 100% Native, Zero Servers

Sup fellow code monkeys. How many times have you downloaded a shiny new note-taking or outlining app—Notion, Evernote, Obsidian—only to uninstall it a week later because it’s bloated, laggy, demands you create an account, and uploads your messy brain-dumps to god-knows-whose server? Frustrated by the same BS, one indie dev just rolled up his sleeves and built a damn fine alternative called Kosshi.

Can't Find a Good App? Just Build One Like a Boss

Let’s look at where this started. A few years ago, Junichi (the creator) was writing a technical book. He realized that sketching the structure first made the writing process way smoother. But at the time, he was juggling multiple personal projects, and his data was scattered across a dozen different tools.

His requirements weren't exactly rocket science: an outliner that worked exactly the same on Mac and iPhone, supported inline images, and kept his data strictly on his own devices.

He couldn't find one that didn't suck, so he built Kosshi.

Kosshi is a 100% native macOS and iOS app. The mad lad actually wrote the rendering engine entirely from scratch. It’s designed to stay buttery smooth even if you have a massive, text-heavy outline. Syncing? It goes straight through iCloud. There are no mandatory accounts, no proprietary backends, and no need to rent a cloud vps to host your data. Your notes live on your devices. Period.

What's the PH Crowd Saying?

Browsing through the Product Hunt comments, the community is vibing hard with this practical approach.

• The Privacy Junkies: People love the "no-account/no-server" model. Outlines are often full of unfinished thoughts and half-baked ideas. Nobody wants that stuff sitting on a corporate server.
• The Tech Inquisitors: One user asked the real dev question: "What was harder to get right: performance with large image-heavy outlines, or keeping the experience simple across both Mac and iOS?"
• Junichi’s Honest Reply: Cross-platform was the real headache. The rendering engine handles layout, text, Markdown, and images all in a single pipeline. Getting that single shared codebase to run cleanly across both Mac and iOS was a massive time sink. As for performance with images? He used a classic trick: rows off-screen pay zero rendering cost. Simple, but highly effective.

The C4F Takeaway: Survival Lessons for Devs

Take notes, indie hackers. You don't always need a massive tech stack or a flashy AI feature to build a product people actually want to use. Sometimes, just scratching your own itch and doing the basics exceptionally well is enough.

In an era where web wrappers and Electron apps devour RAM like it's free candy, a well-optimized Native app with zero backend dependency is incredibly refreshing. If you’re tired of managing APIs and databases, take a page out of Junichi’s book: Build native, sync via iCloud, and sleep soundly at night knowing your app won't crash because a server went down.

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Source: Kosshi on Product Hunt

Filed under [Tools & Tech Stack]